3024 lines
126 KiB
C
3024 lines
126 KiB
C
/*
|
|
* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
|
|
* 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.
|
|
*/
|
|
|
|
|
|
/*-*************************************
|
|
* Tuning parameters
|
|
***************************************/
|
|
#ifndef ZSTD_CLEVEL_DEFAULT
|
|
# define ZSTD_CLEVEL_DEFAULT 3
|
|
#endif
|
|
|
|
|
|
/*-*************************************
|
|
* Dependencies
|
|
***************************************/
|
|
#include <string.h> /* memset */
|
|
#include "mem.h"
|
|
#define FSE_STATIC_LINKING_ONLY /* FSE_encodeSymbol */
|
|
#include "fse.h"
|
|
#define HUF_STATIC_LINKING_ONLY
|
|
#include "huf.h"
|
|
#include "zstd_compress.h"
|
|
#include "zstd_fast.h"
|
|
#include "zstd_double_fast.h"
|
|
#include "zstd_lazy.h"
|
|
#include "zstd_opt.h"
|
|
#include "zstd_ldm.h"
|
|
|
|
|
|
/*-*************************************
|
|
* Helper functions
|
|
***************************************/
|
|
size_t ZSTD_compressBound(size_t srcSize) {
|
|
return ZSTD_COMPRESSBOUND(srcSize);
|
|
}
|
|
|
|
|
|
/*-*************************************
|
|
* Sequence storage
|
|
***************************************/
|
|
static void ZSTD_resetSeqStore(seqStore_t* ssPtr)
|
|
{
|
|
ssPtr->lit = ssPtr->litStart;
|
|
ssPtr->sequences = ssPtr->sequencesStart;
|
|
ssPtr->longLengthID = 0;
|
|
}
|
|
|
|
|
|
/*-*************************************
|
|
* Context memory management
|
|
***************************************/
|
|
struct ZSTD_CDict_s {
|
|
void* dictBuffer;
|
|
const void* dictContent;
|
|
size_t dictContentSize;
|
|
ZSTD_CCtx* refContext;
|
|
}; /* typedef'd to ZSTD_CDict within "zstd.h" */
|
|
|
|
ZSTD_CCtx* ZSTD_createCCtx(void)
|
|
{
|
|
return ZSTD_createCCtx_advanced(ZSTD_defaultCMem);
|
|
}
|
|
|
|
ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem)
|
|
{
|
|
ZSTD_CCtx* cctx;
|
|
|
|
if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
|
|
|
|
cctx = (ZSTD_CCtx*) ZSTD_calloc(sizeof(ZSTD_CCtx), customMem);
|
|
if (!cctx) return NULL;
|
|
cctx->customMem = customMem;
|
|
cctx->requestedParams.compressionLevel = ZSTD_CLEVEL_DEFAULT;
|
|
ZSTD_STATIC_ASSERT(zcss_init==0);
|
|
ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN==(0ULL - 1));
|
|
return cctx;
|
|
}
|
|
|
|
ZSTD_CCtx* ZSTD_initStaticCCtx(void *workspace, size_t workspaceSize)
|
|
{
|
|
ZSTD_CCtx* const cctx = (ZSTD_CCtx*) workspace;
|
|
if (workspaceSize <= sizeof(ZSTD_CCtx)) return NULL; /* minimum size */
|
|
if ((size_t)workspace & 7) return NULL; /* must be 8-aligned */
|
|
memset(workspace, 0, workspaceSize); /* may be a bit generous, could memset be smaller ? */
|
|
cctx->staticSize = workspaceSize;
|
|
cctx->workSpace = (void*)(cctx+1);
|
|
cctx->workSpaceSize = workspaceSize - sizeof(ZSTD_CCtx);
|
|
|
|
/* entropy space (never moves) */
|
|
if (cctx->workSpaceSize < sizeof(ZSTD_entropyCTables_t)) return NULL;
|
|
assert(((size_t)cctx->workSpace & (sizeof(void*)-1)) == 0); /* ensure correct alignment */
|
|
cctx->entropy = (ZSTD_entropyCTables_t*)cctx->workSpace;
|
|
|
|
return cctx;
|
|
}
|
|
|
|
size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx)
|
|
{
|
|
if (cctx==NULL) return 0; /* support free on NULL */
|
|
if (cctx->staticSize) return ERROR(memory_allocation); /* not compatible with static CCtx */
|
|
ZSTD_free(cctx->workSpace, cctx->customMem);
|
|
cctx->workSpace = NULL;
|
|
ZSTD_freeCDict(cctx->cdictLocal);
|
|
cctx->cdictLocal = NULL;
|
|
#ifdef ZSTD_MULTITHREAD
|
|
ZSTDMT_freeCCtx(cctx->mtctx);
|
|
cctx->mtctx = NULL;
|
|
#endif
|
|
ZSTD_free(cctx, cctx->customMem);
|
|
return 0; /* reserved as a potential error code in the future */
|
|
}
|
|
|
|
|
|
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 */
|
|
DEBUGLOG(3, "sizeof(*cctx) : %u", (U32)sizeof(*cctx));
|
|
DEBUGLOG(3, "workSpaceSize (including streaming buffers): %u", (U32)cctx->workSpaceSize);
|
|
DEBUGLOG(3, "inner cdict : %u", (U32)ZSTD_sizeof_CDict(cctx->cdictLocal));
|
|
DEBUGLOG(3, "inner MTCTX : %u", (U32)ZSTD_sizeof_mtctx(cctx));
|
|
return sizeof(*cctx) + cctx->workSpaceSize
|
|
+ ZSTD_sizeof_CDict(cctx->cdictLocal)
|
|
+ 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); }
|
|
|
|
#define ZSTD_CLEVEL_CUSTOM 999
|
|
|
|
static ZSTD_compressionParameters ZSTD_getCParamsFromCCtxParams(
|
|
ZSTD_CCtx_params params, U64 srcSizeHint, size_t dictSize)
|
|
{
|
|
return (params.compressionLevel == ZSTD_CLEVEL_CUSTOM ?
|
|
params.cParams :
|
|
ZSTD_getCParams(params.compressionLevel, srcSizeHint, dictSize));
|
|
}
|
|
|
|
static void ZSTD_cLevelToCCtxParams_srcSize(ZSTD_CCtx_params* params, U64 srcSize)
|
|
{
|
|
params->cParams = ZSTD_getCParamsFromCCtxParams(*params, srcSize, 0);
|
|
params->compressionLevel = ZSTD_CLEVEL_CUSTOM;
|
|
}
|
|
|
|
static void ZSTD_cLevelToCParams(ZSTD_CCtx* cctx)
|
|
{
|
|
ZSTD_cLevelToCCtxParams_srcSize(
|
|
&cctx->requestedParams, cctx->pledgedSrcSizePlusOne-1);
|
|
}
|
|
|
|
static void ZSTD_cLevelToCCtxParams(ZSTD_CCtx_params* params)
|
|
{
|
|
ZSTD_cLevelToCCtxParams_srcSize(params, 0);
|
|
}
|
|
|
|
static ZSTD_CCtx_params ZSTD_makeCCtxParamsFromCParams(
|
|
ZSTD_compressionParameters cParams)
|
|
{
|
|
ZSTD_CCtx_params cctxParams;
|
|
memset(&cctxParams, 0, sizeof(cctxParams));
|
|
cctxParams.cParams = cParams;
|
|
cctxParams.compressionLevel = ZSTD_CLEVEL_CUSTOM;
|
|
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_calloc(
|
|
sizeof(ZSTD_CCtx_params), customMem);
|
|
if (!params) { return NULL; }
|
|
params->customMem = customMem;
|
|
params->compressionLevel = ZSTD_CLEVEL_DEFAULT;
|
|
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_free(params, params->customMem);
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_resetCCtxParams(ZSTD_CCtx_params* params)
|
|
{
|
|
return ZSTD_initCCtxParams(params, ZSTD_CLEVEL_DEFAULT);
|
|
}
|
|
|
|
size_t ZSTD_initCCtxParams(ZSTD_CCtx_params* cctxParams, int compressionLevel) {
|
|
if (!cctxParams) { return ERROR(GENERIC); }
|
|
memset(cctxParams, 0, sizeof(*cctxParams));
|
|
cctxParams->compressionLevel = compressionLevel;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_initCCtxParams_advanced(ZSTD_CCtx_params* cctxParams, ZSTD_parameters params)
|
|
{
|
|
if (!cctxParams) { return ERROR(GENERIC); }
|
|
CHECK_F( ZSTD_checkCParams(params.cParams) );
|
|
memset(cctxParams, 0, sizeof(*cctxParams));
|
|
cctxParams->cParams = params.cParams;
|
|
cctxParams->fParams = params.fParams;
|
|
cctxParams->compressionLevel = ZSTD_CLEVEL_CUSTOM;
|
|
return 0;
|
|
}
|
|
|
|
static ZSTD_CCtx_params ZSTD_assignParamsToCCtxParams(
|
|
ZSTD_CCtx_params cctxParams, ZSTD_parameters params)
|
|
{
|
|
ZSTD_CCtx_params ret = cctxParams;
|
|
ret.cParams = params.cParams;
|
|
ret.fParams = params.fParams;
|
|
ret.compressionLevel = ZSTD_CLEVEL_CUSTOM;
|
|
return ret;
|
|
}
|
|
|
|
#define CLAMPCHECK(val,min,max) { \
|
|
if (((val)<(min)) | ((val)>(max))) { \
|
|
return ERROR(parameter_outOfBound); \
|
|
} }
|
|
|
|
size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, unsigned value)
|
|
{
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
|
|
switch(param)
|
|
{
|
|
case ZSTD_p_format :
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
case ZSTD_p_compressionLevel:
|
|
if (value == 0) return 0; /* special value : 0 means "don't change anything" */
|
|
if (cctx->cdict) return ERROR(stage_wrong);
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
case ZSTD_p_windowLog:
|
|
case ZSTD_p_hashLog:
|
|
case ZSTD_p_chainLog:
|
|
case ZSTD_p_searchLog:
|
|
case ZSTD_p_minMatch:
|
|
case ZSTD_p_targetLength:
|
|
case ZSTD_p_compressionStrategy:
|
|
if (value == 0) return 0; /* special value : 0 means "don't change anything" */
|
|
if (cctx->cdict) return ERROR(stage_wrong);
|
|
ZSTD_cLevelToCParams(cctx); /* Can optimize if srcSize is known */
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
case ZSTD_p_contentSizeFlag:
|
|
case ZSTD_p_checksumFlag:
|
|
case ZSTD_p_dictIDFlag:
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
case ZSTD_p_forceMaxWindow : /* Force back-references to remain < windowSize,
|
|
* even when referencing into Dictionary content
|
|
* default : 0 when using a CDict, 1 when using a Prefix */
|
|
cctx->loadedDictEnd = 0;
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
case ZSTD_p_nbThreads:
|
|
if (value==0) return 0;
|
|
DEBUGLOG(5, " setting nbThreads : %u", value);
|
|
if (value > 1 && cctx->staticSize) {
|
|
return ERROR(parameter_unsupported); /* MT not compatible with static alloc */
|
|
}
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
case ZSTD_p_jobSize:
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
case ZSTD_p_overlapSizeLog:
|
|
DEBUGLOG(5, " setting overlap with nbThreads == %u", cctx->requestedParams.nbThreads);
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
case ZSTD_p_enableLongDistanceMatching:
|
|
if (cctx->cdict) return ERROR(stage_wrong);
|
|
if (value != 0) {
|
|
ZSTD_cLevelToCParams(cctx);
|
|
}
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
case ZSTD_p_ldmHashLog:
|
|
case ZSTD_p_ldmMinMatch:
|
|
if (value == 0) return 0; /* special value : 0 means "don't change anything" */
|
|
if (cctx->cdict) return ERROR(stage_wrong);
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
case ZSTD_p_ldmBucketSizeLog:
|
|
case ZSTD_p_ldmHashEveryLog:
|
|
if (cctx->cdict) return ERROR(stage_wrong);
|
|
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
|
|
|
|
default: return ERROR(parameter_unsupported);
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_CCtxParam_setParameter(
|
|
ZSTD_CCtx_params* params, ZSTD_cParameter param, unsigned value)
|
|
{
|
|
switch(param)
|
|
{
|
|
case ZSTD_p_format :
|
|
if (value > (unsigned)ZSTD_f_zstd1_magicless)
|
|
return ERROR(parameter_unsupported);
|
|
params->format = (ZSTD_format_e)value;
|
|
return 0;
|
|
|
|
case ZSTD_p_compressionLevel :
|
|
if ((int)value > ZSTD_maxCLevel()) value = ZSTD_maxCLevel();
|
|
if (value == 0) return 0;
|
|
params->compressionLevel = value;
|
|
return 0;
|
|
|
|
case ZSTD_p_windowLog :
|
|
if (value == 0) return 0;
|
|
CLAMPCHECK(value, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
|
|
ZSTD_cLevelToCCtxParams(params);
|
|
params->cParams.windowLog = value;
|
|
return 0;
|
|
|
|
case ZSTD_p_hashLog :
|
|
if (value == 0) return 0;
|
|
CLAMPCHECK(value, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
|
|
ZSTD_cLevelToCCtxParams(params);
|
|
params->cParams.hashLog = value;
|
|
return 0;
|
|
|
|
case ZSTD_p_chainLog :
|
|
if (value == 0) return 0;
|
|
CLAMPCHECK(value, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX);
|
|
ZSTD_cLevelToCCtxParams(params);
|
|
params->cParams.chainLog = value;
|
|
return 0;
|
|
|
|
case ZSTD_p_searchLog :
|
|
if (value == 0) return 0;
|
|
CLAMPCHECK(value, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
|
|
ZSTD_cLevelToCCtxParams(params);
|
|
params->cParams.searchLog = value;
|
|
return 0;
|
|
|
|
case ZSTD_p_minMatch :
|
|
if (value == 0) return 0;
|
|
CLAMPCHECK(value, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
|
|
ZSTD_cLevelToCCtxParams(params);
|
|
params->cParams.searchLength = value;
|
|
return 0;
|
|
|
|
case ZSTD_p_targetLength :
|
|
if (value == 0) return 0;
|
|
CLAMPCHECK(value, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX);
|
|
ZSTD_cLevelToCCtxParams(params);
|
|
params->cParams.targetLength = value;
|
|
return 0;
|
|
|
|
case ZSTD_p_compressionStrategy :
|
|
if (value == 0) return 0;
|
|
CLAMPCHECK(value, (unsigned)ZSTD_fast, (unsigned)ZSTD_btultra);
|
|
ZSTD_cLevelToCCtxParams(params);
|
|
params->cParams.strategy = (ZSTD_strategy)value;
|
|
return 0;
|
|
|
|
case ZSTD_p_contentSizeFlag :
|
|
/* Content size written in frame header _when known_ (default:1) */
|
|
DEBUGLOG(5, "set content size flag = %u", (value>0));
|
|
params->fParams.contentSizeFlag = value > 0;
|
|
return 0;
|
|
|
|
case ZSTD_p_checksumFlag :
|
|
/* A 32-bits content checksum will be calculated and written at end of frame (default:0) */
|
|
params->fParams.checksumFlag = value > 0;
|
|
return 0;
|
|
|
|
case ZSTD_p_dictIDFlag : /* When applicable, dictionary's dictID is provided in frame header (default:1) */
|
|
DEBUGLOG(5, "set dictIDFlag = %u", (value>0));
|
|
params->fParams.noDictIDFlag = (value == 0);
|
|
return 0;
|
|
|
|
case ZSTD_p_forceMaxWindow :
|
|
params->forceWindow = value > 0;
|
|
return 0;
|
|
|
|
case ZSTD_p_nbThreads :
|
|
if (value == 0) return 0;
|
|
#ifndef ZSTD_MULTITHREAD
|
|
if (value > 1) return ERROR(parameter_unsupported);
|
|
return 0;
|
|
#else
|
|
return ZSTDMT_initializeCCtxParameters(params, value);
|
|
#endif
|
|
|
|
case ZSTD_p_jobSize :
|
|
#ifndef ZSTD_MULTITHREAD
|
|
return ERROR(parameter_unsupported);
|
|
#else
|
|
if (params->nbThreads <= 1) return ERROR(parameter_unsupported);
|
|
return ZSTDMT_CCtxParam_setMTCtxParameter(params, ZSTDMT_p_sectionSize, value);
|
|
#endif
|
|
|
|
case ZSTD_p_overlapSizeLog :
|
|
#ifndef ZSTD_MULTITHREAD
|
|
return ERROR(parameter_unsupported);
|
|
#else
|
|
if (params->nbThreads <= 1) return ERROR(parameter_unsupported);
|
|
return ZSTDMT_CCtxParam_setMTCtxParameter(params, ZSTDMT_p_overlapSectionLog, value);
|
|
#endif
|
|
|
|
case ZSTD_p_enableLongDistanceMatching :
|
|
if (value != 0) {
|
|
ZSTD_cLevelToCCtxParams(params);
|
|
params->cParams.windowLog = ZSTD_LDM_DEFAULT_WINDOW_LOG;
|
|
}
|
|
return ZSTD_ldm_initializeParameters(¶ms->ldmParams, value);
|
|
|
|
case ZSTD_p_ldmHashLog :
|
|
if (value == 0) return 0;
|
|
CLAMPCHECK(value, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
|
|
params->ldmParams.hashLog = value;
|
|
return 0;
|
|
|
|
case ZSTD_p_ldmMinMatch :
|
|
if (value == 0) return 0;
|
|
CLAMPCHECK(value, ZSTD_LDM_MINMATCH_MIN, ZSTD_LDM_MINMATCH_MAX);
|
|
params->ldmParams.minMatchLength = value;
|
|
return 0;
|
|
|
|
case ZSTD_p_ldmBucketSizeLog :
|
|
if (value > ZSTD_LDM_BUCKETSIZELOG_MAX) {
|
|
return ERROR(parameter_outOfBound);
|
|
}
|
|
params->ldmParams.bucketSizeLog = value;
|
|
return 0;
|
|
|
|
case ZSTD_p_ldmHashEveryLog :
|
|
if (value > ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN) {
|
|
return ERROR(parameter_outOfBound);
|
|
}
|
|
params->ldmParams.hashEveryLog = value;
|
|
return 0;
|
|
|
|
default: return ERROR(parameter_unsupported);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This function should be updated whenever ZSTD_CCtx_params is updated.
|
|
* Parameters are copied manually before the dictionary is loaded.
|
|
* The multithreading parameters jobSize and overlapSizeLog are set only if
|
|
* nbThreads > 1.
|
|
*
|
|
* Pledged srcSize is treated as unknown.
|
|
*/
|
|
size_t ZSTD_CCtx_setParametersUsingCCtxParams(
|
|
ZSTD_CCtx* cctx, const ZSTD_CCtx_params* params)
|
|
{
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
if (cctx->cdict) return ERROR(stage_wrong);
|
|
|
|
/* Assume the compression and frame parameters are validated */
|
|
cctx->requestedParams.cParams = params->cParams;
|
|
cctx->requestedParams.fParams = params->fParams;
|
|
cctx->requestedParams.compressionLevel = params->compressionLevel;
|
|
|
|
/* Set force window explicitly since it sets cctx->loadedDictEnd */
|
|
CHECK_F( ZSTD_CCtx_setParameter(
|
|
cctx, ZSTD_p_forceMaxWindow, params->forceWindow) );
|
|
|
|
/* Set multithreading parameters explicitly */
|
|
CHECK_F( ZSTD_CCtx_setParameter(cctx, ZSTD_p_nbThreads, params->nbThreads) );
|
|
if (params->nbThreads > 1) {
|
|
CHECK_F( ZSTD_CCtx_setParameter(cctx, ZSTD_p_jobSize, params->jobSize) );
|
|
CHECK_F( ZSTD_CCtx_setParameter(
|
|
cctx, ZSTD_p_overlapSizeLog, params->overlapSizeLog) );
|
|
}
|
|
|
|
/* Copy long distance matching parameters */
|
|
cctx->requestedParams.ldmParams = params->ldmParams;
|
|
|
|
/* customMem is used only for create/free params and can be ignored */
|
|
return 0;
|
|
}
|
|
|
|
ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long long pledgedSrcSize)
|
|
{
|
|
DEBUGLOG(4, " setting pledgedSrcSize to %u", (U32)pledgedSrcSize);
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
cctx->pledgedSrcSizePlusOne = pledgedSrcSize+1;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_CCtx_loadDictionary_advanced(
|
|
ZSTD_CCtx* cctx, const void* dict, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictMode_e dictMode)
|
|
{
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
if (cctx->staticSize) return ERROR(memory_allocation); /* no malloc for static CCtx */
|
|
DEBUGLOG(4, "load dictionary of size %u", (U32)dictSize);
|
|
ZSTD_freeCDict(cctx->cdictLocal); /* in case one already exists */
|
|
if (dict==NULL || dictSize==0) { /* no dictionary mode */
|
|
cctx->cdictLocal = NULL;
|
|
cctx->cdict = NULL;
|
|
} else {
|
|
ZSTD_compressionParameters const cParams =
|
|
ZSTD_getCParamsFromCCtxParams(cctx->requestedParams, 0, dictSize);
|
|
cctx->cdictLocal = ZSTD_createCDict_advanced(
|
|
dict, dictSize,
|
|
dictLoadMethod, dictMode,
|
|
cParams, cctx->customMem);
|
|
cctx->cdict = cctx->cdictLocal;
|
|
if (cctx->cdictLocal == NULL)
|
|
return ERROR(memory_allocation);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
ZSTDLIB_API 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_dm_auto);
|
|
}
|
|
|
|
ZSTDLIB_API 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_dm_auto);
|
|
}
|
|
|
|
|
|
size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
|
|
{
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
cctx->cdict = cdict;
|
|
memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); /* exclusive */
|
|
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_dm_rawContent);
|
|
}
|
|
|
|
size_t ZSTD_CCtx_refPrefix_advanced(
|
|
ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize, ZSTD_dictMode_e dictMode)
|
|
{
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
cctx->cdict = NULL; /* prefix discards any prior cdict */
|
|
cctx->prefixDict.dict = prefix;
|
|
cctx->prefixDict.dictSize = prefixSize;
|
|
cctx->prefixDict.dictMode = dictMode;
|
|
return 0;
|
|
}
|
|
|
|
static void ZSTD_startNewCompression(ZSTD_CCtx* cctx)
|
|
{
|
|
cctx->streamStage = zcss_init;
|
|
cctx->pledgedSrcSizePlusOne = 0;
|
|
}
|
|
|
|
/*! ZSTD_CCtx_reset() :
|
|
* Also dumps dictionary */
|
|
void ZSTD_CCtx_reset(ZSTD_CCtx* cctx)
|
|
{
|
|
ZSTD_startNewCompression(cctx);
|
|
cctx->cdict = NULL;
|
|
}
|
|
|
|
/** 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)
|
|
{
|
|
CLAMPCHECK(cParams.windowLog, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
|
|
CLAMPCHECK(cParams.chainLog, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX);
|
|
CLAMPCHECK(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
|
|
CLAMPCHECK(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
|
|
CLAMPCHECK(cParams.searchLength, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
|
|
CLAMPCHECK(cParams.targetLength, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX);
|
|
if ((U32)(cParams.strategy) > (U32)ZSTD_btultra)
|
|
return ERROR(parameter_unsupported);
|
|
return 0;
|
|
}
|
|
|
|
/** ZSTD_clampCParams() :
|
|
* make CParam values within valid range.
|
|
* @return : valid CParams */
|
|
static ZSTD_compressionParameters ZSTD_clampCParams(ZSTD_compressionParameters cParams)
|
|
{
|
|
# define CLAMP(val,min,max) { \
|
|
if (val<min) val=min; \
|
|
else if (val>max) val=max; \
|
|
}
|
|
CLAMP(cParams.windowLog, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
|
|
CLAMP(cParams.chainLog, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX);
|
|
CLAMP(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
|
|
CLAMP(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
|
|
CLAMP(cParams.searchLength, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
|
|
CLAMP(cParams.targetLength, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX);
|
|
if ((U32)(cParams.strategy) > (U32)ZSTD_btultra) cParams.strategy = ZSTD_btultra;
|
|
return cParams;
|
|
}
|
|
|
|
/** ZSTD_cycleLog() :
|
|
* condition for correct operation : hashLog > 1 */
|
|
static U32 ZSTD_cycleLog(U32 hashLog, ZSTD_strategy strat)
|
|
{
|
|
U32 const btScale = ((U32)strat >= (U32)ZSTD_btlazy2);
|
|
return hashLog - btScale;
|
|
}
|
|
|
|
/** ZSTD_adjustCParams_internal() :
|
|
optimize `cPar` for a given input (`srcSize` and `dictSize`).
|
|
mostly downsizing to reduce memory consumption and initialization latency.
|
|
Both `srcSize` and `dictSize` are optional (use 0 if unknown).
|
|
Note : cPar is considered validated at this stage. Use ZSTD_checkCParams() to ensure that condition. */
|
|
ZSTD_compressionParameters ZSTD_adjustCParams_internal(ZSTD_compressionParameters cPar, unsigned long long srcSize, size_t dictSize)
|
|
{
|
|
static const U64 minSrcSize = 513; /* (1<<9) + 1 */
|
|
static const U64 maxWindowResize = 1ULL << (ZSTD_WINDOWLOG_MAX-1);
|
|
assert(ZSTD_checkCParams(cPar)==0);
|
|
|
|
if (dictSize && (srcSize+1<2) /* srcSize unknown */ )
|
|
srcSize = minSrcSize; /* presumed small when there is a dictionary */
|
|
else if (srcSize == 0)
|
|
srcSize = ZSTD_CONTENTSIZE_UNKNOWN; /* 0 == unknown : presumed large */
|
|
|
|
/* 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 (cPar.hashLog > cPar.windowLog) cPar.hashLog = cPar.windowLog;
|
|
{ U32 const cycleLog = ZSTD_cycleLog(cPar.chainLog, cPar.strategy);
|
|
if (cycleLog > cPar.windowLog)
|
|
cPar.chainLog -= (cycleLog - cPar.windowLog);
|
|
}
|
|
|
|
if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN)
|
|
cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* required for frame header */
|
|
|
|
return cPar;
|
|
}
|
|
|
|
ZSTD_compressionParameters ZSTD_adjustCParams(ZSTD_compressionParameters cPar, unsigned long long srcSize, size_t dictSize)
|
|
{
|
|
cPar = ZSTD_clampCParams(cPar);
|
|
return ZSTD_adjustCParams_internal(cPar, srcSize, dictSize);
|
|
}
|
|
|
|
size_t ZSTD_estimateCCtxSize_usingCCtxParams(const ZSTD_CCtx_params* params)
|
|
{
|
|
/* Estimate CCtx size is supported for single-threaded compression only. */
|
|
if (params->nbThreads > 1) { return ERROR(GENERIC); }
|
|
{ ZSTD_compressionParameters const cParams =
|
|
ZSTD_getCParamsFromCCtxParams(*params, 0, 0);
|
|
size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << cParams.windowLog);
|
|
U32 const divider = (cParams.searchLength==3) ? 3 : 4;
|
|
size_t const maxNbSeq = blockSize / divider;
|
|
size_t const tokenSpace = blockSize + 11*maxNbSeq;
|
|
size_t const chainSize =
|
|
(cParams.strategy == ZSTD_fast) ? 0 : ((size_t)1 << cParams.chainLog);
|
|
size_t const hSize = ((size_t)1) << cParams.hashLog;
|
|
U32 const hashLog3 = (cParams.searchLength>3) ?
|
|
0 : MIN(ZSTD_HASHLOG3_MAX, cParams.windowLog);
|
|
size_t const h3Size = ((size_t)1) << hashLog3;
|
|
size_t const entropySpace = sizeof(ZSTD_entropyCTables_t);
|
|
size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
|
|
|
|
size_t const optBudget =
|
|
((MaxML+1) + (MaxLL+1) + (MaxOff+1) + (1<<Litbits))*sizeof(U32)
|
|
+ (ZSTD_OPT_NUM+1)*(sizeof(ZSTD_match_t) + sizeof(ZSTD_optimal_t));
|
|
size_t const optSpace = ((cParams.strategy == ZSTD_btopt) || (cParams.strategy == ZSTD_btultra)) ? optBudget : 0;
|
|
|
|
size_t const ldmSpace = params->ldmParams.enableLdm ?
|
|
ZSTD_ldm_getTableSize(params->ldmParams.hashLog,
|
|
params->ldmParams.bucketSizeLog) : 0;
|
|
|
|
size_t const neededSpace = entropySpace + tableSpace + tokenSpace +
|
|
optSpace + ldmSpace;
|
|
|
|
DEBUGLOG(5, "sizeof(ZSTD_CCtx) : %u", (U32)sizeof(ZSTD_CCtx));
|
|
DEBUGLOG(5, "estimate workSpace : %u", (U32)neededSpace);
|
|
return sizeof(ZSTD_CCtx) + neededSpace;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_estimateCCtxSize_usingCParams(ZSTD_compressionParameters cParams)
|
|
{
|
|
ZSTD_CCtx_params const params = ZSTD_makeCCtxParamsFromCParams(cParams);
|
|
return ZSTD_estimateCCtxSize_usingCCtxParams(¶ms);
|
|
}
|
|
|
|
size_t ZSTD_estimateCCtxSize(int compressionLevel)
|
|
{
|
|
ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, 0, 0);
|
|
return ZSTD_estimateCCtxSize_usingCParams(cParams);
|
|
}
|
|
|
|
size_t ZSTD_estimateCStreamSize_usingCCtxParams(const ZSTD_CCtx_params* params)
|
|
{
|
|
if (params->nbThreads > 1) { return ERROR(GENERIC); }
|
|
{ size_t const CCtxSize = ZSTD_estimateCCtxSize_usingCCtxParams(params);
|
|
size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << params->cParams.windowLog);
|
|
size_t const inBuffSize = ((size_t)1 << params->cParams.windowLog) + blockSize;
|
|
size_t const outBuffSize = ZSTD_compressBound(blockSize) + 1;
|
|
size_t const streamingSize = inBuffSize + outBuffSize;
|
|
|
|
return CCtxSize + streamingSize;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_estimateCStreamSize_usingCParams(ZSTD_compressionParameters cParams)
|
|
{
|
|
ZSTD_CCtx_params const params = ZSTD_makeCCtxParamsFromCParams(cParams);
|
|
return ZSTD_estimateCStreamSize_usingCCtxParams(¶ms);
|
|
}
|
|
|
|
size_t ZSTD_estimateCStreamSize(int compressionLevel) {
|
|
ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, 0, 0);
|
|
return ZSTD_estimateCStreamSize_usingCParams(cParams);
|
|
}
|
|
|
|
static U32 ZSTD_equivalentCParams(ZSTD_compressionParameters cParams1,
|
|
ZSTD_compressionParameters cParams2)
|
|
{
|
|
U32 bslog1 = MIN(cParams1.windowLog, ZSTD_BLOCKSIZELOG_MAX);
|
|
U32 bslog2 = MIN(cParams2.windowLog, ZSTD_BLOCKSIZELOG_MAX);
|
|
return (bslog1 == bslog2) /* same block size */
|
|
& (cParams1.hashLog == cParams2.hashLog)
|
|
& (cParams1.chainLog == cParams2.chainLog)
|
|
& (cParams1.strategy == cParams2.strategy) /* opt parser space */
|
|
& ((cParams1.searchLength==3) == (cParams2.searchLength==3)); /* hashlog3 space */
|
|
}
|
|
|
|
/** The parameters are equivalent if ldm is not enabled in both sets or
|
|
* all the parameters are equivalent. */
|
|
static U32 ZSTD_equivalentLdmParams(ldmParams_t ldmParams1,
|
|
ldmParams_t ldmParams2)
|
|
{
|
|
return (!ldmParams1.enableLdm && !ldmParams2.enableLdm) ||
|
|
(ldmParams1.enableLdm == ldmParams2.enableLdm &&
|
|
ldmParams1.hashLog == ldmParams2.hashLog &&
|
|
ldmParams1.bucketSizeLog == ldmParams2.bucketSizeLog &&
|
|
ldmParams1.minMatchLength == ldmParams2.minMatchLength &&
|
|
ldmParams1.hashEveryLog == ldmParams2.hashEveryLog);
|
|
}
|
|
|
|
/** Equivalence for resetCCtx purposes */
|
|
static U32 ZSTD_equivalentParams(ZSTD_CCtx_params params1,
|
|
ZSTD_CCtx_params params2)
|
|
{
|
|
return ZSTD_equivalentCParams(params1.cParams, params2.cParams) &&
|
|
ZSTD_equivalentLdmParams(params1.ldmParams, params2.ldmParams);
|
|
}
|
|
|
|
/*! ZSTD_continueCCtx() :
|
|
* reuse CCtx without reset (note : requires no dictionary) */
|
|
static size_t ZSTD_continueCCtx(ZSTD_CCtx* cctx, ZSTD_CCtx_params params, U64 pledgedSrcSize)
|
|
{
|
|
U32 const end = (U32)(cctx->nextSrc - cctx->base);
|
|
DEBUGLOG(4, "continue mode");
|
|
cctx->appliedParams = params;
|
|
cctx->pledgedSrcSizePlusOne = pledgedSrcSize+1;
|
|
cctx->consumedSrcSize = 0;
|
|
if (pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN)
|
|
cctx->appliedParams.fParams.contentSizeFlag = 0;
|
|
DEBUGLOG(4, "pledged content size : %u ; flag : %u",
|
|
(U32)pledgedSrcSize, cctx->appliedParams.fParams.contentSizeFlag);
|
|
cctx->lowLimit = end;
|
|
cctx->dictLimit = end;
|
|
cctx->nextToUpdate = end+1;
|
|
cctx->stage = ZSTDcs_init;
|
|
cctx->dictID = 0;
|
|
cctx->loadedDictEnd = 0;
|
|
{ int i; for (i=0; i<ZSTD_REP_NUM; i++) cctx->seqStore.rep[i] = repStartValue[i]; }
|
|
cctx->optState.litLengthSum = 0; /* force reset of btopt stats */
|
|
XXH64_reset(&cctx->xxhState, 0);
|
|
return 0;
|
|
}
|
|
|
|
typedef enum { ZSTDcrp_continue, ZSTDcrp_noMemset } ZSTD_compResetPolicy_e;
|
|
typedef enum { ZSTDb_not_buffered, ZSTDb_buffered } ZSTD_buffered_policy_e;
|
|
|
|
/*! ZSTD_resetCCtx_internal() :
|
|
note : `params` are assumed fully validated at this stage */
|
|
static size_t ZSTD_resetCCtx_internal(ZSTD_CCtx* zc,
|
|
ZSTD_CCtx_params params, U64 pledgedSrcSize,
|
|
ZSTD_compResetPolicy_e const crp,
|
|
ZSTD_buffered_policy_e const zbuff)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_resetCCtx_internal");
|
|
assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
|
|
DEBUGLOG(4, "pledgedSrcSize: %u", (U32)pledgedSrcSize);
|
|
|
|
if (crp == ZSTDcrp_continue) {
|
|
if (ZSTD_equivalentParams(params, zc->appliedParams)) {
|
|
DEBUGLOG(4, "ZSTD_equivalentParams()==1");
|
|
assert(!(params.ldmParams.enableLdm &&
|
|
params.ldmParams.hashEveryLog == ZSTD_LDM_HASHEVERYLOG_NOTSET));
|
|
zc->entropy->hufCTable_repeatMode = HUF_repeat_none;
|
|
zc->entropy->offcode_repeatMode = FSE_repeat_none;
|
|
zc->entropy->matchlength_repeatMode = FSE_repeat_none;
|
|
zc->entropy->litlength_repeatMode = FSE_repeat_none;
|
|
return ZSTD_continueCCtx(zc, params, pledgedSrcSize);
|
|
} }
|
|
|
|
if (params.ldmParams.enableLdm) {
|
|
/* Adjust long distance matching parameters */
|
|
ZSTD_ldm_adjustParameters(¶ms.ldmParams, params.cParams.windowLog);
|
|
assert(params.ldmParams.hashLog >= params.ldmParams.bucketSizeLog);
|
|
assert(params.ldmParams.hashEveryLog < 32);
|
|
zc->ldmState.hashPower =
|
|
ZSTD_ldm_getHashPower(params.ldmParams.minMatchLength);
|
|
}
|
|
|
|
{ size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << params.cParams.windowLog);
|
|
U32 const divider = (params.cParams.searchLength==3) ? 3 : 4;
|
|
size_t const maxNbSeq = blockSize / divider;
|
|
size_t const tokenSpace = blockSize + 11*maxNbSeq;
|
|
size_t const chainSize = (params.cParams.strategy == ZSTD_fast) ?
|
|
0 : ((size_t)1 << params.cParams.chainLog);
|
|
size_t const hSize = ((size_t)1) << params.cParams.hashLog;
|
|
U32 const hashLog3 = (params.cParams.searchLength>3) ?
|
|
0 : MIN(ZSTD_HASHLOG3_MAX, params.cParams.windowLog);
|
|
size_t const h3Size = ((size_t)1) << hashLog3;
|
|
size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
|
|
size_t const buffOutSize = (zbuff==ZSTDb_buffered) ? ZSTD_compressBound(blockSize)+1 : 0;
|
|
size_t const buffInSize = (zbuff==ZSTDb_buffered) ? ((size_t)1 << params.cParams.windowLog) + blockSize : 0;
|
|
void* ptr;
|
|
|
|
/* Check if workSpace is large enough, alloc a new one if needed */
|
|
{ size_t const entropySpace = sizeof(ZSTD_entropyCTables_t);
|
|
size_t const optPotentialSpace = ((MaxML+1) + (MaxLL+1) + (MaxOff+1) + (1<<Litbits)) * sizeof(U32)
|
|
+ (ZSTD_OPT_NUM+1) * (sizeof(ZSTD_match_t)+sizeof(ZSTD_optimal_t));
|
|
size_t const optSpace = ( (params.cParams.strategy == ZSTD_btopt)
|
|
|| (params.cParams.strategy == ZSTD_btultra)) ?
|
|
optPotentialSpace : 0;
|
|
size_t const bufferSpace = buffInSize + buffOutSize;
|
|
size_t const ldmSpace = params.ldmParams.enableLdm
|
|
? ZSTD_ldm_getTableSize(params.ldmParams.hashLog, params.ldmParams.bucketSizeLog)
|
|
: 0;
|
|
size_t const neededSpace = entropySpace + optSpace + ldmSpace +
|
|
tableSpace + tokenSpace + bufferSpace;
|
|
|
|
if (zc->workSpaceSize < neededSpace) { /* too small : resize */
|
|
DEBUGLOG(5, "Need to update workSpaceSize from %uK to %uK \n",
|
|
(unsigned)zc->workSpaceSize>>10,
|
|
(unsigned)neededSpace>>10);
|
|
/* static cctx : no resize, error out */
|
|
if (zc->staticSize) return ERROR(memory_allocation);
|
|
|
|
zc->workSpaceSize = 0;
|
|
ZSTD_free(zc->workSpace, zc->customMem);
|
|
zc->workSpace = ZSTD_malloc(neededSpace, zc->customMem);
|
|
if (zc->workSpace == NULL) return ERROR(memory_allocation);
|
|
zc->workSpaceSize = neededSpace;
|
|
ptr = zc->workSpace;
|
|
|
|
/* entropy space */
|
|
assert(((size_t)zc->workSpace & 3) == 0); /* ensure correct alignment */
|
|
assert(zc->workSpaceSize >= sizeof(ZSTD_entropyCTables_t));
|
|
zc->entropy = (ZSTD_entropyCTables_t*)zc->workSpace;
|
|
} }
|
|
|
|
/* init params */
|
|
zc->appliedParams = params;
|
|
zc->pledgedSrcSizePlusOne = pledgedSrcSize+1;
|
|
zc->consumedSrcSize = 0;
|
|
if (pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN)
|
|
zc->appliedParams.fParams.contentSizeFlag = 0;
|
|
DEBUGLOG(5, "pledged content size : %u ; flag : %u",
|
|
(U32)pledgedSrcSize, zc->appliedParams.fParams.contentSizeFlag);
|
|
zc->blockSize = blockSize;
|
|
|
|
XXH64_reset(&zc->xxhState, 0);
|
|
zc->stage = ZSTDcs_init;
|
|
zc->dictID = 0;
|
|
zc->loadedDictEnd = 0;
|
|
zc->entropy->hufCTable_repeatMode = HUF_repeat_none;
|
|
zc->entropy->offcode_repeatMode = FSE_repeat_none;
|
|
zc->entropy->matchlength_repeatMode = FSE_repeat_none;
|
|
zc->entropy->litlength_repeatMode = FSE_repeat_none;
|
|
zc->nextToUpdate = 1;
|
|
zc->nextSrc = NULL;
|
|
zc->base = NULL;
|
|
zc->dictBase = NULL;
|
|
zc->dictLimit = 0;
|
|
zc->lowLimit = 0;
|
|
{ int i; for (i=0; i<ZSTD_REP_NUM; i++) zc->seqStore.rep[i] = repStartValue[i]; }
|
|
zc->hashLog3 = hashLog3;
|
|
zc->optState.litLengthSum = 0;
|
|
|
|
ptr = zc->entropy + 1;
|
|
|
|
/* opt parser space */
|
|
if ((params.cParams.strategy == ZSTD_btopt) || (params.cParams.strategy == ZSTD_btultra)) {
|
|
DEBUGLOG(5, "reserving optimal parser space");
|
|
assert(((size_t)ptr & 3) == 0); /* ensure ptr is properly aligned */
|
|
zc->optState.litFreq = (U32*)ptr;
|
|
zc->optState.litLengthFreq = zc->optState.litFreq + (1<<Litbits);
|
|
zc->optState.matchLengthFreq = zc->optState.litLengthFreq + (MaxLL+1);
|
|
zc->optState.offCodeFreq = zc->optState.matchLengthFreq + (MaxML+1);
|
|
ptr = zc->optState.offCodeFreq + (MaxOff+1);
|
|
zc->optState.matchTable = (ZSTD_match_t*)ptr;
|
|
ptr = zc->optState.matchTable + ZSTD_OPT_NUM+1;
|
|
zc->optState.priceTable = (ZSTD_optimal_t*)ptr;
|
|
ptr = zc->optState.priceTable + ZSTD_OPT_NUM+1;
|
|
}
|
|
|
|
/* ldm hash table */
|
|
/* initialize bucketOffsets table later for pointer alignment */
|
|
if (params.ldmParams.enableLdm) {
|
|
size_t const ldmHSize = ((size_t)1) << params.ldmParams.hashLog;
|
|
memset(ptr, 0, ldmHSize * sizeof(ldmEntry_t));
|
|
assert(((size_t)ptr & 3) == 0); /* ensure ptr is properly aligned */
|
|
zc->ldmState.hashTable = (ldmEntry_t*)ptr;
|
|
ptr = zc->ldmState.hashTable + ldmHSize;
|
|
}
|
|
|
|
/* table Space */
|
|
if (crp!=ZSTDcrp_noMemset) memset(ptr, 0, tableSpace); /* reset tables only */
|
|
assert(((size_t)ptr & 3) == 0); /* ensure ptr is properly aligned */
|
|
zc->hashTable = (U32*)(ptr);
|
|
zc->chainTable = zc->hashTable + hSize;
|
|
zc->hashTable3 = zc->chainTable + chainSize;
|
|
ptr = zc->hashTable3 + h3Size;
|
|
|
|
/* sequences storage */
|
|
zc->seqStore.sequencesStart = (seqDef*)ptr;
|
|
ptr = zc->seqStore.sequencesStart + maxNbSeq;
|
|
zc->seqStore.llCode = (BYTE*) ptr;
|
|
zc->seqStore.mlCode = zc->seqStore.llCode + maxNbSeq;
|
|
zc->seqStore.ofCode = zc->seqStore.mlCode + maxNbSeq;
|
|
zc->seqStore.litStart = zc->seqStore.ofCode + maxNbSeq;
|
|
ptr = zc->seqStore.litStart + blockSize;
|
|
|
|
/* ldm bucketOffsets table */
|
|
if (params.ldmParams.enableLdm) {
|
|
size_t const ldmBucketSize =
|
|
((size_t)1) << (params.ldmParams.hashLog -
|
|
params.ldmParams.bucketSizeLog);
|
|
memset(ptr, 0, ldmBucketSize);
|
|
zc->ldmState.bucketOffsets = (BYTE*)ptr;
|
|
ptr = zc->ldmState.bucketOffsets + ldmBucketSize;
|
|
}
|
|
|
|
/* buffers */
|
|
zc->inBuffSize = buffInSize;
|
|
zc->inBuff = (char*)ptr;
|
|
zc->outBuffSize = buffOutSize;
|
|
zc->outBuff = zc->inBuff + buffInSize;
|
|
|
|
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->seqStore.rep[i] = 0;
|
|
}
|
|
|
|
|
|
/*! ZSTD_copyCCtx_internal() :
|
|
* Duplicate an existing context `srcCCtx` into another one `dstCCtx`.
|
|
* The "context", in this case, refers to the hash and chain tables, entropy
|
|
* tables, and dictionary offsets.
|
|
* Only works during stage ZSTDcs_init (i.e. after creation, but before first call to ZSTD_compressContinue()).
|
|
* pledgedSrcSize=0 means "empty" if fParams.contentSizeFlag=1
|
|
* @return : 0, or an error code */
|
|
static size_t ZSTD_copyCCtx_internal(ZSTD_CCtx* dstCCtx,
|
|
const ZSTD_CCtx* srcCCtx,
|
|
ZSTD_frameParameters fParams,
|
|
unsigned long long pledgedSrcSize,
|
|
ZSTD_buffered_policy_e zbuff)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_copyCCtx_internal");
|
|
if (srcCCtx->stage!=ZSTDcs_init) return ERROR(stage_wrong);
|
|
|
|
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;
|
|
params.fParams = fParams;
|
|
ZSTD_resetCCtx_internal(dstCCtx, params, pledgedSrcSize,
|
|
ZSTDcrp_noMemset, zbuff);
|
|
}
|
|
|
|
/* copy tables */
|
|
{ size_t const chainSize = (srcCCtx->appliedParams.cParams.strategy == ZSTD_fast) ? 0 : ((size_t)1 << srcCCtx->appliedParams.cParams.chainLog);
|
|
size_t const hSize = (size_t)1 << srcCCtx->appliedParams.cParams.hashLog;
|
|
size_t const h3Size = (size_t)1 << srcCCtx->hashLog3;
|
|
size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
|
|
assert((U32*)dstCCtx->chainTable == (U32*)dstCCtx->hashTable + hSize); /* chainTable must follow hashTable */
|
|
assert((U32*)dstCCtx->hashTable3 == (U32*)dstCCtx->chainTable + chainSize);
|
|
memcpy(dstCCtx->hashTable, srcCCtx->hashTable, tableSpace); /* presumes all tables follow each other */
|
|
}
|
|
|
|
/* copy dictionary offsets */
|
|
dstCCtx->nextToUpdate = srcCCtx->nextToUpdate;
|
|
dstCCtx->nextToUpdate3= srcCCtx->nextToUpdate3;
|
|
dstCCtx->nextSrc = srcCCtx->nextSrc;
|
|
dstCCtx->base = srcCCtx->base;
|
|
dstCCtx->dictBase = srcCCtx->dictBase;
|
|
dstCCtx->dictLimit = srcCCtx->dictLimit;
|
|
dstCCtx->lowLimit = srcCCtx->lowLimit;
|
|
dstCCtx->loadedDictEnd= srcCCtx->loadedDictEnd;
|
|
dstCCtx->dictID = srcCCtx->dictID;
|
|
|
|
/* copy entropy tables */
|
|
memcpy(dstCCtx->entropy, srcCCtx->entropy, sizeof(ZSTD_entropyCTables_t));
|
|
|
|
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 = (ZSTD_buffered_policy_e)(srcCCtx->inBuffSize>0);
|
|
ZSTD_STATIC_ASSERT((U32)ZSTDb_buffered==1);
|
|
fParams.contentSizeFlag = pledgedSrcSize>0;
|
|
|
|
return ZSTD_copyCCtx_internal(dstCCtx, srcCCtx, fParams, pledgedSrcSize, zbuff);
|
|
}
|
|
|
|
|
|
/*! ZSTD_reduceTable() :
|
|
* reduce table indexes by `reducerValue` */
|
|
static void ZSTD_reduceTable (U32* const table, U32 const size, U32 const reducerValue)
|
|
{
|
|
U32 u;
|
|
for (u=0 ; u < size ; u++) {
|
|
if (table[u] < reducerValue) table[u] = 0;
|
|
else table[u] -= reducerValue;
|
|
}
|
|
}
|
|
|
|
/*! ZSTD_ldm_reduceTable() :
|
|
* reduce table indexes by `reducerValue` */
|
|
static void ZSTD_ldm_reduceTable(ldmEntry_t* const table, U32 const size,
|
|
U32 const reducerValue)
|
|
{
|
|
U32 u;
|
|
for (u = 0; u < size; u++) {
|
|
if (table[u].offset < reducerValue) table[u].offset = 0;
|
|
else table[u].offset -= reducerValue;
|
|
}
|
|
}
|
|
|
|
/*! ZSTD_reduceIndex() :
|
|
* rescale all indexes to avoid future overflow (indexes are U32) */
|
|
static void ZSTD_reduceIndex (ZSTD_CCtx* zc, const U32 reducerValue)
|
|
{
|
|
{ U32 const hSize = (U32)1 << zc->appliedParams.cParams.hashLog;
|
|
ZSTD_reduceTable(zc->hashTable, hSize, reducerValue); }
|
|
|
|
{ U32 const chainSize = (zc->appliedParams.cParams.strategy == ZSTD_fast) ? 0 : ((U32)1 << zc->appliedParams.cParams.chainLog);
|
|
ZSTD_reduceTable(zc->chainTable, chainSize, reducerValue); }
|
|
|
|
{ U32 const h3Size = (zc->hashLog3) ? (U32)1 << zc->hashLog3 : 0;
|
|
ZSTD_reduceTable(zc->hashTable3, h3Size, reducerValue); }
|
|
|
|
{ if (zc->appliedParams.ldmParams.enableLdm) {
|
|
U32 const ldmHSize = (U32)1 << zc->appliedParams.ldmParams.hashLog;
|
|
ZSTD_ldm_reduceTable(zc->ldmState.hashTable, ldmHSize, reducerValue);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*-*******************************************************
|
|
* Block entropic compression
|
|
*********************************************************/
|
|
|
|
/* See doc/zstd_compression_format.md for detailed format description */
|
|
|
|
size_t ZSTD_noCompressBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
if (srcSize + ZSTD_blockHeaderSize > dstCapacity) return ERROR(dstSize_tooSmall);
|
|
memcpy((BYTE*)dst + ZSTD_blockHeaderSize, src, srcSize);
|
|
MEM_writeLE24(dst, (U32)(srcSize << 2) + (U32)bt_raw);
|
|
return ZSTD_blockHeaderSize+srcSize;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_noCompressLiterals (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
BYTE* const ostart = (BYTE* const)dst;
|
|
U32 const flSize = 1 + (srcSize>31) + (srcSize>4095);
|
|
|
|
if (srcSize + flSize > dstCapacity) return ERROR(dstSize_tooSmall);
|
|
|
|
switch(flSize)
|
|
{
|
|
case 1: /* 2 - 1 - 5 */
|
|
ostart[0] = (BYTE)((U32)set_basic + (srcSize<<3));
|
|
break;
|
|
case 2: /* 2 - 2 - 12 */
|
|
MEM_writeLE16(ostart, (U16)((U32)set_basic + (1<<2) + (srcSize<<4)));
|
|
break;
|
|
case 3: /* 2 - 2 - 20 */
|
|
MEM_writeLE32(ostart, (U32)((U32)set_basic + (3<<2) + (srcSize<<4)));
|
|
break;
|
|
default: /* not necessary : flSize is {1,2,3} */
|
|
assert(0);
|
|
}
|
|
|
|
memcpy(ostart + flSize, src, srcSize);
|
|
return srcSize + flSize;
|
|
}
|
|
|
|
static size_t ZSTD_compressRleLiteralsBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
BYTE* const ostart = (BYTE* const)dst;
|
|
U32 const flSize = 1 + (srcSize>31) + (srcSize>4095);
|
|
|
|
(void)dstCapacity; /* dstCapacity already guaranteed to be >=4, hence large enough */
|
|
|
|
switch(flSize)
|
|
{
|
|
case 1: /* 2 - 1 - 5 */
|
|
ostart[0] = (BYTE)((U32)set_rle + (srcSize<<3));
|
|
break;
|
|
case 2: /* 2 - 2 - 12 */
|
|
MEM_writeLE16(ostart, (U16)((U32)set_rle + (1<<2) + (srcSize<<4)));
|
|
break;
|
|
case 3: /* 2 - 2 - 20 */
|
|
MEM_writeLE32(ostart, (U32)((U32)set_rle + (3<<2) + (srcSize<<4)));
|
|
break;
|
|
default: /* not necessary : flSize is {1,2,3} */
|
|
assert(0);
|
|
}
|
|
|
|
ostart[flSize] = *(const BYTE*)src;
|
|
return flSize+1;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_minGain(size_t srcSize) { return (srcSize >> 6) + 2; }
|
|
|
|
static size_t ZSTD_compressLiterals (ZSTD_entropyCTables_t * entropy,
|
|
ZSTD_strategy strategy,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
size_t const minGain = ZSTD_minGain(srcSize);
|
|
size_t const lhSize = 3 + (srcSize >= 1 KB) + (srcSize >= 16 KB);
|
|
BYTE* const ostart = (BYTE*)dst;
|
|
U32 singleStream = srcSize < 256;
|
|
symbolEncodingType_e hType = set_compressed;
|
|
size_t cLitSize;
|
|
|
|
|
|
/* small ? don't even attempt compression (speed opt) */
|
|
# define LITERAL_NOENTROPY 63
|
|
{ size_t const minLitSize = entropy->hufCTable_repeatMode == HUF_repeat_valid ? 6 : LITERAL_NOENTROPY;
|
|
if (srcSize <= minLitSize) return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
|
|
}
|
|
|
|
if (dstCapacity < lhSize+1) return ERROR(dstSize_tooSmall); /* not enough space for compression */
|
|
{ HUF_repeat repeat = entropy->hufCTable_repeatMode;
|
|
int const preferRepeat = strategy < ZSTD_lazy ? srcSize <= 1024 : 0;
|
|
if (repeat == HUF_repeat_valid && lhSize == 3) singleStream = 1;
|
|
cLitSize = singleStream ? HUF_compress1X_repeat(ostart+lhSize, dstCapacity-lhSize, src, srcSize, 255, 11,
|
|
entropy->workspace, sizeof(entropy->workspace), (HUF_CElt*)entropy->hufCTable, &repeat, preferRepeat)
|
|
: HUF_compress4X_repeat(ostart+lhSize, dstCapacity-lhSize, src, srcSize, 255, 11,
|
|
entropy->workspace, sizeof(entropy->workspace), (HUF_CElt*)entropy->hufCTable, &repeat, preferRepeat);
|
|
if (repeat != HUF_repeat_none) { hType = set_repeat; } /* reused the existing table */
|
|
else { entropy->hufCTable_repeatMode = HUF_repeat_check; } /* now have a table to reuse */
|
|
}
|
|
|
|
if ((cLitSize==0) | (cLitSize >= srcSize - minGain) | ERR_isError(cLitSize)) {
|
|
entropy->hufCTable_repeatMode = HUF_repeat_none;
|
|
return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
|
|
}
|
|
if (cLitSize==1) {
|
|
entropy->hufCTable_repeatMode = HUF_repeat_none;
|
|
return ZSTD_compressRleLiteralsBlock(dst, dstCapacity, src, srcSize);
|
|
}
|
|
|
|
/* Build header */
|
|
switch(lhSize)
|
|
{
|
|
case 3: /* 2 - 2 - 10 - 10 */
|
|
{ U32 const lhc = hType + ((!singleStream) << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<14);
|
|
MEM_writeLE24(ostart, lhc);
|
|
break;
|
|
}
|
|
case 4: /* 2 - 2 - 14 - 14 */
|
|
{ U32 const lhc = hType + (2 << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<18);
|
|
MEM_writeLE32(ostart, lhc);
|
|
break;
|
|
}
|
|
case 5: /* 2 - 2 - 18 - 18 */
|
|
{ U32 const lhc = hType + (3 << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<22);
|
|
MEM_writeLE32(ostart, lhc);
|
|
ostart[4] = (BYTE)(cLitSize >> 10);
|
|
break;
|
|
}
|
|
default: /* not possible : lhSize is {3,4,5} */
|
|
assert(0);
|
|
}
|
|
return lhSize+cLitSize;
|
|
}
|
|
|
|
|
|
void ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
|
|
{
|
|
BYTE const LL_deltaCode = 19;
|
|
BYTE const ML_deltaCode = 36;
|
|
const seqDef* const sequences = seqStorePtr->sequencesStart;
|
|
BYTE* const llCodeTable = seqStorePtr->llCode;
|
|
BYTE* const ofCodeTable = seqStorePtr->ofCode;
|
|
BYTE* const mlCodeTable = seqStorePtr->mlCode;
|
|
U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
|
|
U32 u;
|
|
for (u=0; u<nbSeq; u++) {
|
|
U32 const llv = sequences[u].litLength;
|
|
U32 const mlv = sequences[u].matchLength;
|
|
llCodeTable[u] = (llv> 63) ? (BYTE)ZSTD_highbit32(llv) + LL_deltaCode : LL_Code[llv];
|
|
ofCodeTable[u] = (BYTE)ZSTD_highbit32(sequences[u].offset);
|
|
mlCodeTable[u] = (mlv>127) ? (BYTE)ZSTD_highbit32(mlv) + ML_deltaCode : ML_Code[mlv];
|
|
}
|
|
if (seqStorePtr->longLengthID==1)
|
|
llCodeTable[seqStorePtr->longLengthPos] = MaxLL;
|
|
if (seqStorePtr->longLengthID==2)
|
|
mlCodeTable[seqStorePtr->longLengthPos] = MaxML;
|
|
}
|
|
|
|
typedef enum {
|
|
ZSTD_defaultDisallowed = 0,
|
|
ZSTD_defaultAllowed = 1
|
|
} ZSTD_defaultPolicy_e;
|
|
|
|
MEM_STATIC symbolEncodingType_e ZSTD_selectEncodingType(
|
|
FSE_repeat* repeatMode, size_t const mostFrequent, size_t nbSeq,
|
|
U32 defaultNormLog, ZSTD_defaultPolicy_e const isDefaultAllowed)
|
|
{
|
|
#define MIN_SEQ_FOR_DYNAMIC_FSE 64
|
|
#define MAX_SEQ_FOR_STATIC_FSE 1000
|
|
ZSTD_STATIC_ASSERT(ZSTD_defaultDisallowed == 0 && ZSTD_defaultAllowed != 0);
|
|
if ((mostFrequent == nbSeq) && (!isDefaultAllowed || nbSeq > 2)) {
|
|
/* Prefer set_basic over set_rle when there are 2 or less symbols,
|
|
* since RLE uses 1 byte, but set_basic uses 5-6 bits per symbol.
|
|
* If basic encoding isn't possible, always choose RLE.
|
|
*/
|
|
*repeatMode = FSE_repeat_check;
|
|
return set_rle;
|
|
}
|
|
if (isDefaultAllowed && (*repeatMode == FSE_repeat_valid) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) {
|
|
return set_repeat;
|
|
}
|
|
if (isDefaultAllowed && ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (defaultNormLog-1))))) {
|
|
*repeatMode = FSE_repeat_valid;
|
|
return set_basic;
|
|
}
|
|
*repeatMode = FSE_repeat_check;
|
|
return set_compressed;
|
|
}
|
|
|
|
MEM_STATIC size_t ZSTD_buildCTable(void* dst, size_t dstCapacity,
|
|
FSE_CTable* CTable, U32 FSELog, symbolEncodingType_e type,
|
|
U32* count, U32 max,
|
|
BYTE const* codeTable, size_t nbSeq,
|
|
S16 const* defaultNorm, U32 defaultNormLog, U32 defaultMax,
|
|
void* workspace, size_t workspaceSize)
|
|
{
|
|
BYTE* op = (BYTE*)dst;
|
|
BYTE const* const oend = op + dstCapacity;
|
|
|
|
switch (type) {
|
|
case set_rle:
|
|
*op = codeTable[0];
|
|
CHECK_F(FSE_buildCTable_rle(CTable, (BYTE)max));
|
|
return 1;
|
|
case set_repeat:
|
|
return 0;
|
|
case set_basic:
|
|
CHECK_F(FSE_buildCTable_wksp(CTable, defaultNorm, defaultMax, defaultNormLog, workspace, workspaceSize));
|
|
return 0;
|
|
case set_compressed: {
|
|
S16 norm[MaxSeq + 1];
|
|
size_t nbSeq_1 = nbSeq;
|
|
const U32 tableLog = FSE_optimalTableLog(FSELog, nbSeq, max);
|
|
if (count[codeTable[nbSeq-1]] > 1) {
|
|
count[codeTable[nbSeq-1]]--;
|
|
nbSeq_1--;
|
|
}
|
|
assert(nbSeq_1 > 1);
|
|
CHECK_F(FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max));
|
|
{ size_t const NCountSize = FSE_writeNCount(op, oend - op, norm, max, tableLog); /* overflow protected */
|
|
if (FSE_isError(NCountSize)) return NCountSize;
|
|
CHECK_F(FSE_buildCTable_wksp(CTable, norm, max, tableLog, workspace, workspaceSize));
|
|
return NCountSize;
|
|
}
|
|
}
|
|
default: return assert(0), ERROR(GENERIC);
|
|
}
|
|
}
|
|
|
|
MEM_STATIC size_t ZSTD_encodeSequences(void* dst, size_t dstCapacity,
|
|
FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
|
|
FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
|
|
FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
|
|
seqDef const* sequences, size_t nbSeq, int longOffsets)
|
|
{
|
|
BIT_CStream_t blockStream;
|
|
FSE_CState_t stateMatchLength;
|
|
FSE_CState_t stateOffsetBits;
|
|
FSE_CState_t stateLitLength;
|
|
|
|
CHECK_E(BIT_initCStream(&blockStream, dst, dstCapacity), dstSize_tooSmall); /* not enough space remaining */
|
|
|
|
/* first symbols */
|
|
FSE_initCState2(&stateMatchLength, CTable_MatchLength, mlCodeTable[nbSeq-1]);
|
|
FSE_initCState2(&stateOffsetBits, CTable_OffsetBits, ofCodeTable[nbSeq-1]);
|
|
FSE_initCState2(&stateLitLength, CTable_LitLength, llCodeTable[nbSeq-1]);
|
|
BIT_addBits(&blockStream, sequences[nbSeq-1].litLength, LL_bits[llCodeTable[nbSeq-1]]);
|
|
if (MEM_32bits()) BIT_flushBits(&blockStream);
|
|
BIT_addBits(&blockStream, sequences[nbSeq-1].matchLength, ML_bits[mlCodeTable[nbSeq-1]]);
|
|
if (MEM_32bits()) BIT_flushBits(&blockStream);
|
|
if (longOffsets) {
|
|
U32 const ofBits = ofCodeTable[nbSeq-1];
|
|
int const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1);
|
|
if (extraBits) {
|
|
BIT_addBits(&blockStream, sequences[nbSeq-1].offset, extraBits);
|
|
BIT_flushBits(&blockStream);
|
|
}
|
|
BIT_addBits(&blockStream, sequences[nbSeq-1].offset >> extraBits,
|
|
ofBits - extraBits);
|
|
} else {
|
|
BIT_addBits(&blockStream, sequences[nbSeq-1].offset, ofCodeTable[nbSeq-1]);
|
|
}
|
|
BIT_flushBits(&blockStream);
|
|
|
|
{ size_t n;
|
|
for (n=nbSeq-2 ; n<nbSeq ; n--) { /* intentional underflow */
|
|
BYTE const llCode = llCodeTable[n];
|
|
BYTE const ofCode = ofCodeTable[n];
|
|
BYTE const mlCode = mlCodeTable[n];
|
|
U32 const llBits = LL_bits[llCode];
|
|
U32 const ofBits = ofCode; /* 32b*/ /* 64b*/
|
|
U32 const mlBits = ML_bits[mlCode];
|
|
/* (7)*/ /* (7)*/
|
|
FSE_encodeSymbol(&blockStream, &stateOffsetBits, ofCode); /* 15 */ /* 15 */
|
|
FSE_encodeSymbol(&blockStream, &stateMatchLength, mlCode); /* 24 */ /* 24 */
|
|
if (MEM_32bits()) BIT_flushBits(&blockStream); /* (7)*/
|
|
FSE_encodeSymbol(&blockStream, &stateLitLength, llCode); /* 16 */ /* 33 */
|
|
if (MEM_32bits() || (ofBits+mlBits+llBits >= 64-7-(LLFSELog+MLFSELog+OffFSELog)))
|
|
BIT_flushBits(&blockStream); /* (7)*/
|
|
BIT_addBits(&blockStream, sequences[n].litLength, llBits);
|
|
if (MEM_32bits() && ((llBits+mlBits)>24)) BIT_flushBits(&blockStream);
|
|
BIT_addBits(&blockStream, sequences[n].matchLength, mlBits);
|
|
if (MEM_32bits() || (ofBits+mlBits+llBits > 56)) BIT_flushBits(&blockStream);
|
|
if (longOffsets) {
|
|
int const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1);
|
|
if (extraBits) {
|
|
BIT_addBits(&blockStream, sequences[n].offset, extraBits);
|
|
BIT_flushBits(&blockStream); /* (7)*/
|
|
}
|
|
BIT_addBits(&blockStream, sequences[n].offset >> extraBits,
|
|
ofBits - extraBits); /* 31 */
|
|
} else {
|
|
BIT_addBits(&blockStream, sequences[n].offset, ofBits); /* 31 */
|
|
}
|
|
BIT_flushBits(&blockStream); /* (7)*/
|
|
} }
|
|
|
|
FSE_flushCState(&blockStream, &stateMatchLength);
|
|
FSE_flushCState(&blockStream, &stateOffsetBits);
|
|
FSE_flushCState(&blockStream, &stateLitLength);
|
|
|
|
{ size_t const streamSize = BIT_closeCStream(&blockStream);
|
|
if (streamSize==0) return ERROR(dstSize_tooSmall); /* not enough space */
|
|
return streamSize;
|
|
}
|
|
}
|
|
|
|
MEM_STATIC size_t ZSTD_compressSequences_internal(seqStore_t* seqStorePtr,
|
|
ZSTD_entropyCTables_t* entropy,
|
|
ZSTD_compressionParameters const* cParams,
|
|
void* dst, size_t dstCapacity)
|
|
{
|
|
const int longOffsets = cParams->windowLog > STREAM_ACCUMULATOR_MIN;
|
|
U32 count[MaxSeq+1];
|
|
FSE_CTable* CTable_LitLength = entropy->litlengthCTable;
|
|
FSE_CTable* CTable_OffsetBits = entropy->offcodeCTable;
|
|
FSE_CTable* CTable_MatchLength = entropy->matchlengthCTable;
|
|
U32 LLtype, Offtype, MLtype; /* compressed, raw or rle */
|
|
const seqDef* const sequences = seqStorePtr->sequencesStart;
|
|
const BYTE* const ofCodeTable = seqStorePtr->ofCode;
|
|
const BYTE* const llCodeTable = seqStorePtr->llCode;
|
|
const BYTE* const mlCodeTable = seqStorePtr->mlCode;
|
|
BYTE* const ostart = (BYTE*)dst;
|
|
BYTE* const oend = ostart + dstCapacity;
|
|
BYTE* op = ostart;
|
|
size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
|
|
BYTE* seqHead;
|
|
|
|
ZSTD_STATIC_ASSERT(sizeof(entropy->workspace) >= (1<<MAX(MLFSELog,LLFSELog)));
|
|
|
|
/* Compress literals */
|
|
{ const BYTE* const literals = seqStorePtr->litStart;
|
|
size_t const litSize = seqStorePtr->lit - literals;
|
|
size_t const cSize = ZSTD_compressLiterals(
|
|
entropy, cParams->strategy, op, dstCapacity, literals, litSize);
|
|
if (ZSTD_isError(cSize))
|
|
return cSize;
|
|
op += cSize;
|
|
}
|
|
|
|
/* Sequences Header */
|
|
if ((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead */) return ERROR(dstSize_tooSmall);
|
|
if (nbSeq < 0x7F) *op++ = (BYTE)nbSeq;
|
|
else if (nbSeq < LONGNBSEQ) op[0] = (BYTE)((nbSeq>>8) + 0x80), op[1] = (BYTE)nbSeq, op+=2;
|
|
else op[0]=0xFF, MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ)), op+=3;
|
|
if (nbSeq==0) return op - ostart;
|
|
|
|
/* seqHead : flags for FSE encoding type */
|
|
seqHead = op++;
|
|
|
|
/* convert length/distances into codes */
|
|
ZSTD_seqToCodes(seqStorePtr);
|
|
/* CTable for Literal Lengths */
|
|
{ U32 max = MaxLL;
|
|
size_t const mostFrequent = FSE_countFast_wksp(count, &max, llCodeTable, nbSeq, entropy->workspace);
|
|
LLtype = ZSTD_selectEncodingType(&entropy->litlength_repeatMode, mostFrequent, nbSeq, LL_defaultNormLog, ZSTD_defaultAllowed);
|
|
{ size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_LitLength, LLFSELog, (symbolEncodingType_e)LLtype,
|
|
count, max, llCodeTable, nbSeq, LL_defaultNorm, LL_defaultNormLog, MaxLL,
|
|
entropy->workspace, sizeof(entropy->workspace));
|
|
if (ZSTD_isError(countSize)) return countSize;
|
|
op += countSize;
|
|
} }
|
|
/* CTable for Offsets */
|
|
{ U32 max = MaxOff;
|
|
size_t const mostFrequent = FSE_countFast_wksp(count, &max, ofCodeTable, nbSeq, entropy->workspace);
|
|
/* 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;
|
|
Offtype = ZSTD_selectEncodingType(&entropy->offcode_repeatMode, mostFrequent, nbSeq, OF_defaultNormLog, defaultPolicy);
|
|
{ size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_OffsetBits, OffFSELog, (symbolEncodingType_e)Offtype,
|
|
count, max, ofCodeTable, nbSeq, OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
|
|
entropy->workspace, sizeof(entropy->workspace));
|
|
if (ZSTD_isError(countSize)) return countSize;
|
|
op += countSize;
|
|
} }
|
|
/* CTable for MatchLengths */
|
|
{ U32 max = MaxML;
|
|
size_t const mostFrequent = FSE_countFast_wksp(count, &max, mlCodeTable, nbSeq, entropy->workspace);
|
|
MLtype = ZSTD_selectEncodingType(&entropy->matchlength_repeatMode, mostFrequent, nbSeq, ML_defaultNormLog, ZSTD_defaultAllowed);
|
|
{ size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_MatchLength, MLFSELog, (symbolEncodingType_e)MLtype,
|
|
count, max, mlCodeTable, nbSeq, ML_defaultNorm, ML_defaultNormLog, MaxML,
|
|
entropy->workspace, sizeof(entropy->workspace));
|
|
if (ZSTD_isError(countSize)) return countSize;
|
|
op += countSize;
|
|
} }
|
|
|
|
*seqHead = (BYTE)((LLtype<<6) + (Offtype<<4) + (MLtype<<2));
|
|
|
|
{ size_t const streamSize = ZSTD_encodeSequences(op, oend - op,
|
|
CTable_MatchLength, mlCodeTable,
|
|
CTable_OffsetBits, ofCodeTable,
|
|
CTable_LitLength, llCodeTable,
|
|
sequences, nbSeq, longOffsets);
|
|
if (ZSTD_isError(streamSize)) return streamSize;
|
|
op += streamSize;
|
|
}
|
|
|
|
return op - ostart;
|
|
}
|
|
|
|
MEM_STATIC size_t ZSTD_compressSequences(seqStore_t* seqStorePtr,
|
|
ZSTD_entropyCTables_t* entropy,
|
|
ZSTD_compressionParameters const* cParams,
|
|
void* dst, size_t dstCapacity,
|
|
size_t srcSize)
|
|
{
|
|
size_t const cSize = ZSTD_compressSequences_internal(seqStorePtr, entropy, cParams,
|
|
dst, dstCapacity);
|
|
size_t const minGain = ZSTD_minGain(srcSize);
|
|
size_t const maxCSize = srcSize - minGain;
|
|
/* If the srcSize <= dstCapacity, then there is enough space to write a
|
|
* raw uncompressed block. Since we ran out of space, the block must not
|
|
* be compressible, so fall back to a raw uncompressed block.
|
|
*/
|
|
int const uncompressibleError = cSize == ERROR(dstSize_tooSmall) && srcSize <= dstCapacity;
|
|
|
|
if (ZSTD_isError(cSize) && !uncompressibleError)
|
|
return cSize;
|
|
/* Check compressibility */
|
|
if (cSize >= maxCSize || uncompressibleError) {
|
|
entropy->hufCTable_repeatMode = HUF_repeat_none;
|
|
entropy->offcode_repeatMode = FSE_repeat_none;
|
|
entropy->matchlength_repeatMode = FSE_repeat_none;
|
|
entropy->litlength_repeatMode = FSE_repeat_none;
|
|
return 0;
|
|
}
|
|
assert(!ZSTD_isError(cSize));
|
|
|
|
/* confirm repcodes */
|
|
{ int i; for (i=0; i<ZSTD_REP_NUM; i++) seqStorePtr->rep[i] = seqStorePtr->repToConfirm[i]; }
|
|
return cSize;
|
|
}
|
|
|
|
/* ZSTD_selectBlockCompressor() :
|
|
* Not static, but internal use only (used by long distance matcher)
|
|
* assumption : strat is a valid strategy */
|
|
typedef size_t (*ZSTD_blockCompressor) (ZSTD_CCtx* ctx, const void* src, size_t srcSize);
|
|
ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, int extDict)
|
|
{
|
|
static const ZSTD_blockCompressor blockCompressor[2][(unsigned)ZSTD_btultra+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_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_STATIC_ASSERT((unsigned)ZSTD_fast == 1);
|
|
assert((U32)strat >= (U32)ZSTD_fast);
|
|
assert((U32)strat <= (U32)ZSTD_btultra);
|
|
|
|
return blockCompressor[extDict!=0][(U32)strat];
|
|
}
|
|
|
|
static void ZSTD_storeLastLiterals(seqStore_t* seqStorePtr,
|
|
const BYTE* anchor, size_t lastLLSize)
|
|
{
|
|
memcpy(seqStorePtr->lit, anchor, lastLLSize);
|
|
seqStorePtr->lit += lastLLSize;
|
|
}
|
|
|
|
static size_t ZSTD_compressBlock_internal(ZSTD_CCtx* zc, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
const BYTE* const base = zc->base;
|
|
const BYTE* const istart = (const BYTE*)src;
|
|
const U32 current = (U32)(istart-base);
|
|
size_t lastLLSize;
|
|
const BYTE* anchor;
|
|
U32 const extDict = zc->lowLimit < zc->dictLimit;
|
|
const ZSTD_blockCompressor blockCompressor =
|
|
zc->appliedParams.ldmParams.enableLdm
|
|
? (extDict ? ZSTD_compressBlock_ldm_extDict : ZSTD_compressBlock_ldm)
|
|
: ZSTD_selectBlockCompressor(zc->appliedParams.cParams.strategy, extDict);
|
|
|
|
if (srcSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) return 0; /* don't even attempt compression below a certain srcSize */
|
|
ZSTD_resetSeqStore(&(zc->seqStore));
|
|
if (current > zc->nextToUpdate + 384)
|
|
zc->nextToUpdate = current - MIN(192, (U32)(current - zc->nextToUpdate - 384)); /* limited update after finding a very long match */
|
|
|
|
lastLLSize = blockCompressor(zc, src, srcSize);
|
|
|
|
/* Last literals */
|
|
anchor = (const BYTE*)src + srcSize - lastLLSize;
|
|
ZSTD_storeLastLiterals(&zc->seqStore, anchor, lastLLSize);
|
|
|
|
return ZSTD_compressSequences(&zc->seqStore, zc->entropy, &zc->appliedParams.cParams, dst, dstCapacity, srcSize);
|
|
}
|
|
|
|
|
|
/*! 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;
|
|
|
|
if (cctx->appliedParams.fParams.checksumFlag && srcSize)
|
|
XXH64_update(&cctx->xxhState, src, srcSize);
|
|
|
|
while (remaining) {
|
|
U32 const lastBlock = lastFrameChunk & (blockSize >= remaining);
|
|
size_t cSize;
|
|
|
|
if (dstCapacity < ZSTD_blockHeaderSize + MIN_CBLOCK_SIZE)
|
|
return ERROR(dstSize_tooSmall); /* not enough space to store compressed block */
|
|
if (remaining < blockSize) blockSize = remaining;
|
|
|
|
/* preemptive overflow correction:
|
|
* 1. correction is large enough:
|
|
* lowLimit > (3<<29) ==> current > 3<<29 + 1<<windowLog - blockSize
|
|
* 1<<windowLog <= newCurrent < 1<<chainLog + 1<<windowLog
|
|
*
|
|
* current - newCurrent
|
|
* > (3<<29 + 1<<windowLog - blockSize) - (1<<windowLog + 1<<chainLog)
|
|
* > (3<<29 - blockSize) - (1<<chainLog)
|
|
* > (3<<29 - blockSize) - (1<<30) (NOTE: chainLog <= 30)
|
|
* > 1<<29 - 1<<17
|
|
*
|
|
* 2. (ip+blockSize - cctx->base) doesn't overflow:
|
|
* In 32 bit mode we limit windowLog to 30 so we don't get
|
|
* differences larger than 1<<31-1.
|
|
* 3. cctx->lowLimit < 1<<32:
|
|
* windowLog <= 31 ==> 3<<29 + 1<<windowLog < 7<<29 < 1<<32.
|
|
*/
|
|
if (cctx->lowLimit > (3U<<29)) {
|
|
U32 const cycleMask = ((U32)1 << ZSTD_cycleLog(cctx->appliedParams.cParams.chainLog, cctx->appliedParams.cParams.strategy)) - 1;
|
|
U32 const current = (U32)(ip - cctx->base);
|
|
U32 const newCurrent = (current & cycleMask) + ((U32)1 << cctx->appliedParams.cParams.windowLog);
|
|
U32 const correction = current - newCurrent;
|
|
ZSTD_STATIC_ASSERT(ZSTD_CHAINLOG_MAX <= 30);
|
|
ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX_32 <= 30);
|
|
ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX <= 31);
|
|
assert(current > newCurrent);
|
|
assert(correction > 1<<28); /* Loose bound, should be about 1<<29 */
|
|
ZSTD_reduceIndex(cctx, correction);
|
|
cctx->base += correction;
|
|
cctx->dictBase += correction;
|
|
cctx->lowLimit -= correction;
|
|
cctx->dictLimit -= correction;
|
|
if (cctx->nextToUpdate < correction) cctx->nextToUpdate = 0;
|
|
else cctx->nextToUpdate -= correction;
|
|
DEBUGLOG(4, "Correction of 0x%x bytes to lowLimit=0x%x\n", correction, cctx->lowLimit);
|
|
}
|
|
|
|
if ((U32)(ip+blockSize - cctx->base) > cctx->loadedDictEnd + maxDist) {
|
|
/* enforce maxDist */
|
|
U32 const newLowLimit = (U32)(ip+blockSize - cctx->base) - maxDist;
|
|
if (cctx->lowLimit < newLowLimit) cctx->lowLimit = newLowLimit;
|
|
if (cctx->dictLimit < cctx->lowLimit) cctx->dictLimit = cctx->lowLimit;
|
|
}
|
|
|
|
cSize = ZSTD_compressBlock_internal(cctx, op+ZSTD_blockHeaderSize, dstCapacity-ZSTD_blockHeaderSize, ip, blockSize);
|
|
if (ZSTD_isError(cSize)) return cSize;
|
|
|
|
if (cSize == 0) { /* block is not compressible */
|
|
U32 const cBlockHeader24 = lastBlock + (((U32)bt_raw)<<1) + (U32)(blockSize << 3);
|
|
if (blockSize + ZSTD_blockHeaderSize > dstCapacity) return ERROR(dstSize_tooSmall);
|
|
MEM_writeLE32(op, cBlockHeader24); /* no pb, 4th byte will be overwritten */
|
|
memcpy(op + ZSTD_blockHeaderSize, ip, blockSize);
|
|
cSize = ZSTD_blockHeaderSize+blockSize;
|
|
} else {
|
|
U32 const cBlockHeader24 = lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
|
|
MEM_writeLE24(op, cBlockHeader24);
|
|
cSize += ZSTD_blockHeaderSize;
|
|
}
|
|
|
|
remaining -= blockSize;
|
|
dstCapacity -= cSize;
|
|
ip += blockSize;
|
|
op += cSize;
|
|
}
|
|
|
|
if (lastFrameChunk && (op>ostart)) cctx->stage = ZSTDcs_ending;
|
|
return op-ostart;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_writeFrameHeader(void* dst, size_t dstCapacity,
|
|
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 frameHeaderDecriptionByte = (BYTE)(dictIDSizeCode + (checksumFlag<<2) + (singleSegment<<5) + (fcsCode<<6) );
|
|
size_t pos=0;
|
|
|
|
if (dstCapacity < ZSTD_frameHeaderSize_max) return ERROR(dstSize_tooSmall);
|
|
DEBUGLOG(4, "ZSTD_writeFrameHeader : dictIDFlag : %u ; dictID : %u ; dictIDSizeCode : %u",
|
|
!params.fParams.noDictIDFlag, dictID, dictIDSizeCode);
|
|
|
|
if (params.format == ZSTD_f_zstd1) {
|
|
DEBUGLOG(4, "writing zstd magic number");
|
|
MEM_writeLE32(dst, ZSTD_MAGICNUMBER);
|
|
pos = 4;
|
|
}
|
|
op[pos++] = frameHeaderDecriptionByte;
|
|
if (!singleSegment) op[pos++] = windowLogByte;
|
|
switch(dictIDSizeCode)
|
|
{
|
|
default: assert(0); /* impossible */
|
|
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 */
|
|
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;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
U32 frame, U32 lastFrameChunk)
|
|
{
|
|
const BYTE* const ip = (const BYTE*) src;
|
|
size_t fhSize = 0;
|
|
|
|
DEBUGLOG(5, "ZSTD_compressContinue_internal");
|
|
DEBUGLOG(5, "stage: %u", cctx->stage);
|
|
if (cctx->stage==ZSTDcs_created) return ERROR(stage_wrong); /* missing init (ZSTD_compressBegin) */
|
|
|
|
if (frame && (cctx->stage==ZSTDcs_init)) {
|
|
fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->appliedParams,
|
|
cctx->pledgedSrcSizePlusOne-1, cctx->dictID);
|
|
if (ZSTD_isError(fhSize)) return fhSize;
|
|
dstCapacity -= fhSize;
|
|
dst = (char*)dst + fhSize;
|
|
cctx->stage = ZSTDcs_ongoing;
|
|
}
|
|
|
|
/* Check if blocks follow each other */
|
|
if (src != cctx->nextSrc) {
|
|
/* not contiguous */
|
|
ptrdiff_t const delta = cctx->nextSrc - ip;
|
|
cctx->lowLimit = cctx->dictLimit;
|
|
cctx->dictLimit = (U32)(cctx->nextSrc - cctx->base);
|
|
cctx->dictBase = cctx->base;
|
|
cctx->base -= delta;
|
|
cctx->nextToUpdate = cctx->dictLimit;
|
|
if (cctx->dictLimit - cctx->lowLimit < HASH_READ_SIZE) cctx->lowLimit = cctx->dictLimit; /* too small extDict */
|
|
}
|
|
|
|
/* if input and dictionary overlap : reduce dictionary (area presumed modified by input) */
|
|
if ((ip+srcSize > cctx->dictBase + cctx->lowLimit) & (ip < cctx->dictBase + cctx->dictLimit)) {
|
|
ptrdiff_t const highInputIdx = (ip + srcSize) - cctx->dictBase;
|
|
U32 const lowLimitMax = (highInputIdx > (ptrdiff_t)cctx->dictLimit) ? cctx->dictLimit : (U32)highInputIdx;
|
|
cctx->lowLimit = lowLimitMax;
|
|
}
|
|
|
|
cctx->nextSrc = ip + srcSize;
|
|
|
|
if (srcSize) {
|
|
size_t const cSize = frame ?
|
|
ZSTD_compress_frameChunk (cctx, dst, dstCapacity, src, srcSize, lastFrameChunk) :
|
|
ZSTD_compressBlock_internal (cctx, dst, dstCapacity, src, srcSize);
|
|
if (ZSTD_isError(cSize)) return cSize;
|
|
cctx->consumedSrcSize += srcSize;
|
|
return cSize + fhSize;
|
|
} else
|
|
return fhSize;
|
|
}
|
|
|
|
size_t ZSTD_compressContinue (ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1 /* frame mode */, 0 /* last chunk */);
|
|
}
|
|
|
|
|
|
size_t ZSTD_getBlockSize(const ZSTD_CCtx* cctx)
|
|
{
|
|
ZSTD_compressionParameters const cParams =
|
|
ZSTD_getCParamsFromCCtxParams(cctx->appliedParams, 0, 0);
|
|
return MIN (ZSTD_BLOCKSIZE_MAX, (U32)1 << cParams.windowLog);
|
|
}
|
|
|
|
size_t ZSTD_compressBlock(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
size_t const blockSizeMax = ZSTD_getBlockSize(cctx);
|
|
if (srcSize > blockSizeMax) return ERROR(srcSize_wrong);
|
|
return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 0 /* frame mode */, 0 /* last chunk */);
|
|
}
|
|
|
|
/*! ZSTD_loadDictionaryContent() :
|
|
* @return : 0, or an error code
|
|
*/
|
|
static size_t ZSTD_loadDictionaryContent(ZSTD_CCtx* zc, const void* src, size_t srcSize)
|
|
{
|
|
const BYTE* const ip = (const BYTE*) src;
|
|
const BYTE* const iend = ip + srcSize;
|
|
|
|
/* input becomes current prefix */
|
|
zc->lowLimit = zc->dictLimit;
|
|
zc->dictLimit = (U32)(zc->nextSrc - zc->base);
|
|
zc->dictBase = zc->base;
|
|
zc->base += ip - zc->nextSrc;
|
|
zc->nextToUpdate = zc->dictLimit;
|
|
zc->loadedDictEnd = zc->appliedParams.forceWindow ? 0 : (U32)(iend - zc->base);
|
|
|
|
zc->nextSrc = iend;
|
|
if (srcSize <= HASH_READ_SIZE) return 0;
|
|
|
|
switch(zc->appliedParams.cParams.strategy)
|
|
{
|
|
case ZSTD_fast:
|
|
ZSTD_fillHashTable (zc, iend, zc->appliedParams.cParams.searchLength);
|
|
break;
|
|
case ZSTD_dfast:
|
|
ZSTD_fillDoubleHashTable (zc, iend, zc->appliedParams.cParams.searchLength);
|
|
break;
|
|
|
|
case ZSTD_greedy:
|
|
case ZSTD_lazy:
|
|
case ZSTD_lazy2:
|
|
if (srcSize >= HASH_READ_SIZE)
|
|
ZSTD_insertAndFindFirstIndex(zc, iend-HASH_READ_SIZE, zc->appliedParams.cParams.searchLength);
|
|
break;
|
|
|
|
case ZSTD_btlazy2:
|
|
case ZSTD_btopt:
|
|
case ZSTD_btultra:
|
|
if (srcSize >= HASH_READ_SIZE)
|
|
ZSTD_updateTree(zc, iend-HASH_READ_SIZE, iend, (U32)1 << zc->appliedParams.cParams.searchLog, zc->appliedParams.cParams.searchLength);
|
|
break;
|
|
|
|
default:
|
|
assert(0); /* not possible : not a valid strategy id */
|
|
}
|
|
|
|
zc->nextToUpdate = (U32)(iend - zc->base);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Dictionaries that assign zero probability to symbols that show up causes problems
|
|
when FSE encoding. Refuse dictionaries that assign zero probability to symbols
|
|
that we may encounter during compression.
|
|
NOTE: This behavior is not standard and could be improved in the future. */
|
|
static size_t ZSTD_checkDictNCount(short* normalizedCounter, unsigned dictMaxSymbolValue, unsigned maxSymbolValue) {
|
|
U32 s;
|
|
if (dictMaxSymbolValue < maxSymbolValue) return ERROR(dictionary_corrupted);
|
|
for (s = 0; s <= maxSymbolValue; ++s) {
|
|
if (normalizedCounter[s] == 0) return ERROR(dictionary_corrupted);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Dictionary format :
|
|
* See :
|
|
* https://github.com/facebook/zstd/blob/master/doc/zstd_compression_format.md#dictionary-format
|
|
*/
|
|
/*! ZSTD_loadZstdDictionary() :
|
|
* @return : 0, or an error code
|
|
* assumptions : magic number supposed already checked
|
|
* dictSize supposed > 8
|
|
*/
|
|
static size_t ZSTD_loadZstdDictionary(ZSTD_CCtx* cctx, const void* dict, size_t dictSize)
|
|
{
|
|
const BYTE* dictPtr = (const BYTE*)dict;
|
|
const BYTE* const dictEnd = dictPtr + dictSize;
|
|
short offcodeNCount[MaxOff+1];
|
|
unsigned offcodeMaxValue = MaxOff;
|
|
|
|
ZSTD_STATIC_ASSERT(sizeof(cctx->entropy->workspace) >= (1<<MAX(MLFSELog,LLFSELog)));
|
|
|
|
dictPtr += 4; /* skip magic number */
|
|
cctx->dictID = cctx->appliedParams.fParams.noDictIDFlag ? 0 : MEM_readLE32(dictPtr);
|
|
dictPtr += 4;
|
|
|
|
{ unsigned maxSymbolValue = 255;
|
|
size_t const hufHeaderSize = HUF_readCTable((HUF_CElt*)cctx->entropy->hufCTable, &maxSymbolValue, dictPtr, dictEnd-dictPtr);
|
|
if (HUF_isError(hufHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (maxSymbolValue < 255) return ERROR(dictionary_corrupted);
|
|
dictPtr += hufHeaderSize;
|
|
}
|
|
|
|
{ unsigned offcodeLog;
|
|
size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr);
|
|
if (FSE_isError(offcodeHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (offcodeLog > OffFSELog) return ERROR(dictionary_corrupted);
|
|
/* Defer checking offcodeMaxValue because we need to know the size of the dictionary content */
|
|
CHECK_E( FSE_buildCTable_wksp(cctx->entropy->offcodeCTable, offcodeNCount, offcodeMaxValue, offcodeLog, cctx->entropy->workspace, sizeof(cctx->entropy->workspace)),
|
|
dictionary_corrupted);
|
|
dictPtr += offcodeHeaderSize;
|
|
}
|
|
|
|
{ short matchlengthNCount[MaxML+1];
|
|
unsigned matchlengthMaxValue = MaxML, matchlengthLog;
|
|
size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr);
|
|
if (FSE_isError(matchlengthHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (matchlengthLog > MLFSELog) return ERROR(dictionary_corrupted);
|
|
/* Every match length code must have non-zero probability */
|
|
CHECK_F( ZSTD_checkDictNCount(matchlengthNCount, matchlengthMaxValue, MaxML));
|
|
CHECK_E( FSE_buildCTable_wksp(cctx->entropy->matchlengthCTable, matchlengthNCount, matchlengthMaxValue, matchlengthLog, cctx->entropy->workspace, sizeof(cctx->entropy->workspace)),
|
|
dictionary_corrupted);
|
|
dictPtr += matchlengthHeaderSize;
|
|
}
|
|
|
|
{ short litlengthNCount[MaxLL+1];
|
|
unsigned litlengthMaxValue = MaxLL, litlengthLog;
|
|
size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr);
|
|
if (FSE_isError(litlengthHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (litlengthLog > LLFSELog) return ERROR(dictionary_corrupted);
|
|
/* Every literal length code must have non-zero probability */
|
|
CHECK_F( ZSTD_checkDictNCount(litlengthNCount, litlengthMaxValue, MaxLL));
|
|
CHECK_E( FSE_buildCTable_wksp(cctx->entropy->litlengthCTable, litlengthNCount, litlengthMaxValue, litlengthLog, cctx->entropy->workspace, sizeof(cctx->entropy->workspace)),
|
|
dictionary_corrupted);
|
|
dictPtr += litlengthHeaderSize;
|
|
}
|
|
|
|
if (dictPtr+12 > dictEnd) return ERROR(dictionary_corrupted);
|
|
cctx->seqStore.rep[0] = MEM_readLE32(dictPtr+0);
|
|
cctx->seqStore.rep[1] = MEM_readLE32(dictPtr+4);
|
|
cctx->seqStore.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 */
|
|
CHECK_F (ZSTD_checkDictNCount(offcodeNCount, offcodeMaxValue, MIN(offcodeMax, MaxOff)));
|
|
/* All repCodes must be <= dictContentSize and != 0*/
|
|
{ U32 u;
|
|
for (u=0; u<3; u++) {
|
|
if (cctx->seqStore.rep[u] == 0) return ERROR(dictionary_corrupted);
|
|
if (cctx->seqStore.rep[u] > dictContentSize) return ERROR(dictionary_corrupted);
|
|
} }
|
|
|
|
cctx->entropy->hufCTable_repeatMode = HUF_repeat_valid;
|
|
cctx->entropy->offcode_repeatMode = FSE_repeat_valid;
|
|
cctx->entropy->matchlength_repeatMode = FSE_repeat_valid;
|
|
cctx->entropy->litlength_repeatMode = FSE_repeat_valid;
|
|
return ZSTD_loadDictionaryContent(cctx, dictPtr, dictContentSize);
|
|
}
|
|
}
|
|
|
|
/** ZSTD_compress_insertDictionary() :
|
|
* @return : 0, or an error code */
|
|
static size_t ZSTD_compress_insertDictionary(ZSTD_CCtx* cctx,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictMode_e dictMode)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_compress_insertDictionary");
|
|
if ((dict==NULL) || (dictSize<=8)) return 0;
|
|
|
|
/* dict restricted modes */
|
|
if (dictMode==ZSTD_dm_rawContent)
|
|
return ZSTD_loadDictionaryContent(cctx, dict, dictSize);
|
|
|
|
if (MEM_readLE32(dict) != ZSTD_MAGIC_DICTIONARY) {
|
|
if (dictMode == ZSTD_dm_auto) {
|
|
DEBUGLOG(5, "raw content dictionary detected");
|
|
return ZSTD_loadDictionaryContent(cctx, dict, dictSize);
|
|
}
|
|
if (dictMode == ZSTD_dm_fullDict)
|
|
return ERROR(dictionary_wrong);
|
|
assert(0); /* impossible */
|
|
}
|
|
|
|
/* dict as full zstd dictionary */
|
|
return ZSTD_loadZstdDictionary(cctx, dict, dictSize);
|
|
}
|
|
|
|
/*! ZSTD_compressBegin_internal() :
|
|
* @return : 0, or an error code */
|
|
static size_t ZSTD_compressBegin_internal(ZSTD_CCtx* cctx,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictMode_e dictMode,
|
|
const ZSTD_CDict* cdict,
|
|
ZSTD_CCtx_params params, U64 pledgedSrcSize,
|
|
ZSTD_buffered_policy_e zbuff)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_compressBegin_internal");
|
|
/* 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) {
|
|
return ZSTD_copyCCtx_internal(cctx, cdict->refContext,
|
|
params.fParams, pledgedSrcSize,
|
|
zbuff);
|
|
}
|
|
|
|
CHECK_F( ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
|
|
ZSTDcrp_continue, zbuff) );
|
|
return ZSTD_compress_insertDictionary(cctx, dict, dictSize, dictMode);
|
|
}
|
|
|
|
size_t ZSTD_compressBegin_advanced_internal(
|
|
ZSTD_CCtx* cctx,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictMode_e dictMode,
|
|
ZSTD_CCtx_params params,
|
|
unsigned long long pledgedSrcSize)
|
|
{
|
|
/* compression parameters verification and optimization */
|
|
CHECK_F( ZSTD_checkCParams(params.cParams) );
|
|
return ZSTD_compressBegin_internal(cctx, dict, dictSize, dictMode, NULL,
|
|
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 const cctxParams =
|
|
ZSTD_assignParamsToCCtxParams(cctx->requestedParams, params);
|
|
return ZSTD_compressBegin_advanced_internal(cctx, dict, dictSize, ZSTD_dm_auto,
|
|
cctxParams,
|
|
pledgedSrcSize);
|
|
}
|
|
|
|
size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_parameters const params = ZSTD_getParams(compressionLevel, 0, dictSize);
|
|
ZSTD_CCtx_params const cctxParams =
|
|
ZSTD_assignParamsToCCtxParams(cctx->requestedParams, params);
|
|
return ZSTD_compressBegin_internal(cctx, dict, dictSize, ZSTD_dm_auto, NULL,
|
|
cctxParams, 0, ZSTDb_not_buffered);
|
|
}
|
|
|
|
size_t ZSTD_compressBegin(ZSTD_CCtx* cctx, int compressionLevel)
|
|
{
|
|
return ZSTD_compressBegin_usingDict(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;
|
|
size_t fhSize = 0;
|
|
|
|
DEBUGLOG(5, "ZSTD_writeEpilogue");
|
|
if (cctx->stage == ZSTDcs_created) return ERROR(stage_wrong); /* init missing */
|
|
|
|
/* special case : empty frame */
|
|
if (cctx->stage == ZSTDcs_init) {
|
|
fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->appliedParams, 0, 0);
|
|
if (ZSTD_isError(fhSize)) return fhSize;
|
|
dstCapacity -= fhSize;
|
|
op += fhSize;
|
|
cctx->stage = ZSTDcs_ongoing;
|
|
}
|
|
|
|
if (cctx->stage != ZSTDcs_ending) {
|
|
/* write one last empty block, make it the "last" block */
|
|
U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1) + 0;
|
|
if (dstCapacity<4) return ERROR(dstSize_tooSmall);
|
|
MEM_writeLE32(op, cBlockHeader24);
|
|
op += ZSTD_blockHeaderSize;
|
|
dstCapacity -= ZSTD_blockHeaderSize;
|
|
}
|
|
|
|
if (cctx->appliedParams.fParams.checksumFlag) {
|
|
U32 const checksum = (U32) XXH64_digest(&cctx->xxhState);
|
|
if (dstCapacity<4) return ERROR(dstSize_tooSmall);
|
|
MEM_writeLE32(op, checksum);
|
|
op += 4;
|
|
}
|
|
|
|
cctx->stage = ZSTDcs_created; /* return to "created but no init" status */
|
|
return op-ostart;
|
|
}
|
|
|
|
|
|
size_t ZSTD_compressEnd (ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
size_t endResult;
|
|
size_t const cSize = ZSTD_compressContinue_internal(cctx,
|
|
dst, dstCapacity, src, srcSize,
|
|
1 /* frame mode */, 1 /* last chunk */);
|
|
if (ZSTD_isError(cSize)) return cSize;
|
|
endResult = ZSTD_writeEpilogue(cctx, (char*)dst + cSize, dstCapacity-cSize);
|
|
if (ZSTD_isError(endResult)) return endResult;
|
|
if (cctx->appliedParams.fParams.contentSizeFlag) { /* control src size */
|
|
DEBUGLOG(4, "end of frame : controlling src size");
|
|
if (cctx->pledgedSrcSizePlusOne != cctx->consumedSrcSize+1) {
|
|
DEBUGLOG(4, "error : pledgedSrcSize = %u, while realSrcSize = %u",
|
|
(U32)cctx->pledgedSrcSizePlusOne-1, (U32)cctx->consumedSrcSize);
|
|
return ERROR(srcSize_wrong);
|
|
} }
|
|
return cSize + endResult;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_compress_internal (ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict,size_t dictSize,
|
|
ZSTD_parameters params)
|
|
{
|
|
ZSTD_CCtx_params const cctxParams =
|
|
ZSTD_assignParamsToCCtxParams(cctx->requestedParams, params);
|
|
return ZSTD_compress_advanced_internal(cctx,
|
|
dst, dstCapacity,
|
|
src, srcSize,
|
|
dict, dictSize,
|
|
cctxParams);
|
|
}
|
|
|
|
size_t ZSTD_compress_advanced (ZSTD_CCtx* ctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict,size_t dictSize,
|
|
ZSTD_parameters params)
|
|
{
|
|
CHECK_F(ZSTD_checkCParams(params.cParams));
|
|
return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params);
|
|
}
|
|
|
|
/* 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,
|
|
ZSTD_CCtx_params params)
|
|
{
|
|
CHECK_F( ZSTD_compressBegin_internal(cctx, dict, dictSize, ZSTD_dm_auto, NULL,
|
|
params, srcSize, ZSTDb_not_buffered) );
|
|
return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
|
|
}
|
|
|
|
size_t ZSTD_compress_usingDict(ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize,
|
|
const void* dict, size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_parameters params = ZSTD_getParams(compressionLevel, srcSize, dict ? dictSize : 0);
|
|
params.fParams.contentSizeFlag = 1;
|
|
return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params);
|
|
}
|
|
|
|
size_t ZSTD_compressCCtx (ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel)
|
|
{
|
|
return ZSTD_compress_usingDict(ctx, 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;
|
|
ZSTD_CCtx ctxBody;
|
|
memset(&ctxBody, 0, sizeof(ctxBody));
|
|
ctxBody.customMem = ZSTD_defaultCMem;
|
|
result = ZSTD_compressCCtx(&ctxBody, dst, dstCapacity, src, srcSize, compressionLevel);
|
|
ZSTD_free(ctxBody.workSpace, ZSTD_defaultCMem); /* can't free ctxBody itself, as it's on stack; free only heap content */
|
|
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", (U32)sizeof(ZSTD_CDict));
|
|
DEBUGLOG(5, "CCtx estimate : %u",
|
|
(U32)ZSTD_estimateCCtxSize_usingCParams(cParams));
|
|
return sizeof(ZSTD_CDict) + ZSTD_estimateCCtxSize_usingCParams(cParams)
|
|
+ (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize);
|
|
}
|
|
|
|
size_t ZSTD_estimateCDictSize(size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
|
|
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", (U32)sizeof(*cdict));
|
|
DEBUGLOG(5, "ZSTD_sizeof_CCtx : %u", (U32)ZSTD_sizeof_CCtx(cdict->refContext));
|
|
return ZSTD_sizeof_CCtx(cdict->refContext) + (cdict->dictBuffer ? cdict->dictContentSize : 0) + sizeof(*cdict);
|
|
}
|
|
|
|
static size_t ZSTD_initCDict_internal(
|
|
ZSTD_CDict* cdict,
|
|
const void* dictBuffer, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictMode_e dictMode,
|
|
ZSTD_compressionParameters cParams)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_initCDict_internal, mode %u", (U32)dictMode);
|
|
if ((dictLoadMethod == ZSTD_dlm_byRef) || (!dictBuffer) || (!dictSize)) {
|
|
cdict->dictBuffer = NULL;
|
|
cdict->dictContent = dictBuffer;
|
|
} else {
|
|
void* const internalBuffer = ZSTD_malloc(dictSize, cdict->refContext->customMem);
|
|
cdict->dictBuffer = internalBuffer;
|
|
cdict->dictContent = internalBuffer;
|
|
if (!internalBuffer) return ERROR(memory_allocation);
|
|
memcpy(internalBuffer, dictBuffer, dictSize);
|
|
}
|
|
cdict->dictContentSize = dictSize;
|
|
|
|
{ ZSTD_CCtx_params cctxParams = cdict->refContext->requestedParams;
|
|
cctxParams.cParams = cParams;
|
|
CHECK_F( ZSTD_compressBegin_internal(cdict->refContext,
|
|
cdict->dictContent, dictSize, dictMode,
|
|
NULL,
|
|
cctxParams, ZSTD_CONTENTSIZE_UNKNOWN,
|
|
ZSTDb_not_buffered) );
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
ZSTD_CDict* ZSTD_createCDict_advanced(const void* dictBuffer, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictMode_e dictMode,
|
|
ZSTD_compressionParameters cParams, ZSTD_customMem customMem)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_createCDict_advanced, mode %u", (U32)dictMode);
|
|
if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
|
|
|
|
{ ZSTD_CDict* const cdict = (ZSTD_CDict*)ZSTD_malloc(sizeof(ZSTD_CDict), customMem);
|
|
ZSTD_CCtx* const cctx = ZSTD_createCCtx_advanced(customMem);
|
|
|
|
if (!cdict || !cctx) {
|
|
ZSTD_free(cdict, customMem);
|
|
ZSTD_freeCCtx(cctx);
|
|
return NULL;
|
|
}
|
|
cdict->refContext = cctx;
|
|
if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
|
|
dictBuffer, dictSize,
|
|
dictLoadMethod, dictMode,
|
|
cParams) )) {
|
|
ZSTD_freeCDict(cdict);
|
|
return NULL;
|
|
}
|
|
|
|
return cdict;
|
|
}
|
|
}
|
|
|
|
ZSTD_CDict* ZSTD_createCDict(const void* dict, size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_compressionParameters cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
|
|
return ZSTD_createCDict_advanced(dict, dictSize,
|
|
ZSTD_dlm_byCopy, ZSTD_dm_auto,
|
|
cParams, ZSTD_defaultCMem);
|
|
}
|
|
|
|
ZSTD_CDict* ZSTD_createCDict_byReference(const void* dict, size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_compressionParameters cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
|
|
return ZSTD_createCDict_advanced(dict, dictSize,
|
|
ZSTD_dlm_byRef, ZSTD_dm_auto,
|
|
cParams, ZSTD_defaultCMem);
|
|
}
|
|
|
|
size_t ZSTD_freeCDict(ZSTD_CDict* cdict)
|
|
{
|
|
if (cdict==NULL) return 0; /* support free on NULL */
|
|
{ ZSTD_customMem const cMem = cdict->refContext->customMem;
|
|
ZSTD_freeCCtx(cdict->refContext);
|
|
ZSTD_free(cdict->dictBuffer, cMem);
|
|
ZSTD_free(cdict, cMem);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*! 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.
|
|
*/
|
|
ZSTD_CDict* ZSTD_initStaticCDict(void* workspace, size_t workspaceSize,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictMode_e dictMode,
|
|
ZSTD_compressionParameters cParams)
|
|
{
|
|
size_t const cctxSize = ZSTD_estimateCCtxSize_usingCParams(cParams);
|
|
size_t const neededSize = sizeof(ZSTD_CDict) + (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize)
|
|
+ cctxSize;
|
|
ZSTD_CDict* const cdict = (ZSTD_CDict*) workspace;
|
|
void* ptr;
|
|
DEBUGLOG(5, "(size_t)workspace & 7 : %u", (U32)(size_t)workspace & 7);
|
|
if ((size_t)workspace & 7) return NULL; /* 8-aligned */
|
|
DEBUGLOG(5, "(workspaceSize < neededSize) : (%u < %u) => %u",
|
|
(U32)workspaceSize, (U32)neededSize, (U32)(workspaceSize < neededSize));
|
|
if (workspaceSize < neededSize) return NULL;
|
|
|
|
if (dictLoadMethod == ZSTD_dlm_byCopy) {
|
|
memcpy(cdict+1, dict, dictSize);
|
|
dict = cdict+1;
|
|
ptr = (char*)workspace + sizeof(ZSTD_CDict) + dictSize;
|
|
} else {
|
|
ptr = cdict+1;
|
|
}
|
|
cdict->refContext = ZSTD_initStaticCCtx(ptr, cctxSize);
|
|
|
|
if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
|
|
dict, dictSize,
|
|
ZSTD_dlm_byRef, dictMode,
|
|
cParams) ))
|
|
return NULL;
|
|
|
|
return cdict;
|
|
}
|
|
|
|
ZSTD_compressionParameters ZSTD_getCParamsFromCDict(const ZSTD_CDict* cdict) {
|
|
return cdict->refContext->appliedParams.cParams;
|
|
}
|
|
|
|
/* ZSTD_compressBegin_usingCDict_advanced() :
|
|
* 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)
|
|
{
|
|
if (cdict==NULL) return ERROR(dictionary_wrong);
|
|
{ ZSTD_CCtx_params params = cctx->requestedParams;
|
|
params.cParams = ZSTD_getCParamsFromCDict(cdict);
|
|
params.fParams = fParams;
|
|
DEBUGLOG(5, "ZSTD_compressBegin_usingCDict_advanced");
|
|
return ZSTD_compressBegin_internal(cctx,
|
|
NULL, 0, ZSTD_dm_auto,
|
|
cdict,
|
|
params, pledgedSrcSize,
|
|
ZSTDb_not_buffered);
|
|
}
|
|
}
|
|
|
|
/* ZSTD_compressBegin_usingCDict() :
|
|
* pledgedSrcSize=0 means "unknown"
|
|
* if pledgedSrcSize>0, it will enable contentSizeFlag */
|
|
size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
|
|
{
|
|
ZSTD_frameParameters const fParams = { 0 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
|
|
DEBUGLOG(5, "ZSTD_compressBegin_usingCDict : dictIDFlag == %u", !fParams.noDictIDFlag);
|
|
return ZSTD_compressBegin_usingCDict_advanced(cctx, cdict, fParams, 0);
|
|
}
|
|
|
|
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)
|
|
{
|
|
CHECK_F (ZSTD_compressBegin_usingCDict_advanced(cctx, cdict, fParams, srcSize)); /* will check if cdict != NULL */
|
|
return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
|
|
}
|
|
|
|
/*! 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_advanced(cctx, dst, dstCapacity, src, srcSize, cdict, fParams);
|
|
}
|
|
|
|
|
|
|
|
/* ******************************************************************
|
|
* Streaming
|
|
********************************************************************/
|
|
|
|
ZSTD_CStream* ZSTD_createCStream(void)
|
|
{
|
|
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 size_t ZSTD_resetCStream_internal(ZSTD_CStream* zcs,
|
|
const void* dict, size_t dictSize, ZSTD_dictMode_e dictMode,
|
|
const ZSTD_CDict* cdict,
|
|
const ZSTD_CCtx_params params, unsigned long long pledgedSrcSize)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_resetCStream_internal");
|
|
/* 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 */
|
|
|
|
CHECK_F( ZSTD_compressBegin_internal(zcs,
|
|
dict, dictSize, dictMode,
|
|
cdict,
|
|
params, pledgedSrcSize,
|
|
ZSTDb_buffered) );
|
|
|
|
zcs->inToCompress = 0;
|
|
zcs->inBuffPos = 0;
|
|
zcs->inBuffTarget = zcs->blockSize;
|
|
zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0;
|
|
zcs->streamStage = zcss_load;
|
|
zcs->frameEnded = 0;
|
|
return 0; /* ready to go */
|
|
}
|
|
|
|
size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pledgedSrcSize)
|
|
{
|
|
ZSTD_CCtx_params params = zcs->requestedParams;
|
|
params.fParams.contentSizeFlag = (pledgedSrcSize > 0);
|
|
params.cParams = ZSTD_getCParamsFromCCtxParams(params, pledgedSrcSize, 0);
|
|
DEBUGLOG(4, "ZSTD_resetCStream");
|
|
return ZSTD_resetCStream_internal(zcs, NULL, 0, ZSTD_dm_auto, zcs->cdict, params, pledgedSrcSize);
|
|
}
|
|
|
|
/*! ZSTD_initCStream_internal() :
|
|
* Note : not static, but hidden (not exposed). 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,
|
|
ZSTD_CCtx_params params, unsigned long long pledgedSrcSize)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_initCStream_internal");
|
|
assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
|
|
assert(!((dict) && (cdict))); /* either dict or cdict, not both */
|
|
|
|
if (dict && dictSize >= 8) {
|
|
DEBUGLOG(5, "loading dictionary of size %u", (U32)dictSize);
|
|
if (zcs->staticSize) { /* static CCtx : never uses malloc */
|
|
/* incompatible with internal cdict creation */
|
|
return ERROR(memory_allocation);
|
|
}
|
|
ZSTD_freeCDict(zcs->cdictLocal);
|
|
zcs->cdictLocal = ZSTD_createCDict_advanced(dict, dictSize,
|
|
ZSTD_dlm_byCopy, ZSTD_dm_auto,
|
|
params.cParams, zcs->customMem);
|
|
zcs->cdict = zcs->cdictLocal;
|
|
if (zcs->cdictLocal == NULL) return ERROR(memory_allocation);
|
|
} else {
|
|
if (cdict) {
|
|
params.cParams = ZSTD_getCParamsFromCDict(cdict); /* cParams are enforced from cdict */
|
|
}
|
|
ZSTD_freeCDict(zcs->cdictLocal);
|
|
zcs->cdictLocal = NULL;
|
|
zcs->cdict = cdict;
|
|
}
|
|
|
|
params.compressionLevel = ZSTD_CLEVEL_CUSTOM;
|
|
zcs->requestedParams = params;
|
|
|
|
return ZSTD_resetCStream_internal(zcs, NULL, 0, ZSTD_dm_auto, zcs->cdict, params, pledgedSrcSize);
|
|
}
|
|
|
|
/* 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)
|
|
{ /* cannot handle NULL cdict (does not know what to do) */
|
|
if (!cdict) return ERROR(dictionary_wrong);
|
|
{ ZSTD_CCtx_params params = zcs->requestedParams;
|
|
params.cParams = ZSTD_getCParamsFromCDict(cdict);
|
|
params.fParams = fParams;
|
|
return ZSTD_initCStream_internal(zcs,
|
|
NULL, 0, cdict,
|
|
params, pledgedSrcSize);
|
|
}
|
|
}
|
|
|
|
/* note : cdict must outlive compression session */
|
|
size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict)
|
|
{
|
|
ZSTD_frameParameters const fParams = { 0 /* contentSize */, 0 /* checksum */, 0 /* hideDictID */ };
|
|
return ZSTD_initCStream_usingCDict_advanced(zcs, cdict, fParams, 0); /* note : will check that cdict != NULL */
|
|
}
|
|
|
|
size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_parameters params, unsigned long long pledgedSrcSize)
|
|
{
|
|
ZSTD_CCtx_params const cctxParams =
|
|
ZSTD_assignParamsToCCtxParams(zcs->requestedParams, params);
|
|
CHECK_F( ZSTD_checkCParams(params.cParams) );
|
|
return ZSTD_initCStream_internal(zcs, dict, dictSize, NULL, cctxParams, pledgedSrcSize);
|
|
}
|
|
|
|
size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_parameters const params = ZSTD_getParams(compressionLevel, 0, dictSize);
|
|
ZSTD_CCtx_params const cctxParams =
|
|
ZSTD_assignParamsToCCtxParams(zcs->requestedParams, params);
|
|
return ZSTD_initCStream_internal(zcs, dict, dictSize, NULL, cctxParams, 0);
|
|
}
|
|
|
|
size_t ZSTD_initCStream_srcSize(ZSTD_CStream* zcs, int compressionLevel, unsigned long long pledgedSrcSize)
|
|
{
|
|
ZSTD_CCtx_params cctxParams;
|
|
ZSTD_parameters const params = ZSTD_getParams(compressionLevel, pledgedSrcSize, 0);
|
|
cctxParams = ZSTD_assignParamsToCCtxParams(zcs->requestedParams, params);
|
|
cctxParams.fParams.contentSizeFlag = (pledgedSrcSize>0);
|
|
return ZSTD_initCStream_internal(zcs, NULL, 0, NULL, cctxParams, pledgedSrcSize);
|
|
}
|
|
|
|
size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel)
|
|
{
|
|
return ZSTD_initCStream_srcSize(zcs, compressionLevel, 0);
|
|
}
|
|
|
|
/*====== Compression ======*/
|
|
|
|
MEM_STATIC size_t ZSTD_limitCopy(void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
size_t const length = MIN(dstCapacity, srcSize);
|
|
if (length) memcpy(dst, src, length);
|
|
return length;
|
|
}
|
|
|
|
/** ZSTD_compressStream_generic():
|
|
* internal function for all *compressStream*() variants and *compress_generic()
|
|
* non-static, because can be called from zstdmt.c
|
|
* @return : hint size for next input */
|
|
size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs,
|
|
ZSTD_outBuffer* output,
|
|
ZSTD_inBuffer* input,
|
|
ZSTD_EndDirective const flushMode)
|
|
{
|
|
const char* const istart = (const char*)input->src;
|
|
const char* const iend = istart + input->size;
|
|
const char* ip = istart + input->pos;
|
|
char* const ostart = (char*)output->dst;
|
|
char* const oend = ostart + output->size;
|
|
char* op = ostart + output->pos;
|
|
U32 someMoreWork = 1;
|
|
|
|
/* check expectations */
|
|
DEBUGLOG(5, "ZSTD_compressStream_generic, flush=%u", (U32)flushMode);
|
|
assert(zcs->inBuff != NULL);
|
|
assert(zcs->inBuffSize>0);
|
|
assert(zcs->outBuff!= NULL);
|
|
assert(zcs->outBuffSize>0);
|
|
assert(output->pos <= output->size);
|
|
assert(input->pos <= input->size);
|
|
|
|
while (someMoreWork) {
|
|
switch(zcs->streamStage)
|
|
{
|
|
case zcss_init:
|
|
/* call ZSTD_initCStream() first ! */
|
|
return ERROR(init_missing);
|
|
|
|
case zcss_load:
|
|
if ( (flushMode == ZSTD_e_end)
|
|
&& ((size_t)(oend-op) >= ZSTD_compressBound(iend-ip)) /* enough dstCapacity */
|
|
&& (zcs->inBuffPos == 0) ) {
|
|
/* shortcut to compression pass directly into output buffer */
|
|
size_t const cSize = ZSTD_compressEnd(zcs,
|
|
op, oend-op, ip, iend-ip);
|
|
DEBUGLOG(4, "ZSTD_compressEnd : %u", (U32)cSize);
|
|
if (ZSTD_isError(cSize)) return cSize;
|
|
ip = iend;
|
|
op += cSize;
|
|
zcs->frameEnded = 1;
|
|
ZSTD_startNewCompression(zcs);
|
|
someMoreWork = 0; break;
|
|
}
|
|
/* complete loading into inBuffer */
|
|
{ size_t const toLoad = zcs->inBuffTarget - zcs->inBuffPos;
|
|
size_t const loaded = ZSTD_limitCopy(
|
|
zcs->inBuff + zcs->inBuffPos, toLoad,
|
|
ip, iend-ip);
|
|
zcs->inBuffPos += loaded;
|
|
ip += loaded;
|
|
if ( (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;
|
|
}
|
|
}
|
|
/* compress current block (note : this stage cannot be stopped in the middle) */
|
|
DEBUGLOG(5, "stream compression stage (flushMode==%u)", flushMode);
|
|
{ void* cDst;
|
|
size_t cSize;
|
|
size_t const iSize = zcs->inBuffPos - zcs->inToCompress;
|
|
size_t oSize = oend-op;
|
|
unsigned const lastBlock = (flushMode == ZSTD_e_end) && (ip==iend);
|
|
if (oSize >= ZSTD_compressBound(iSize))
|
|
cDst = op; /* compress into output buffer, to skip flush stage */
|
|
else
|
|
cDst = zcs->outBuff, oSize = zcs->outBuffSize;
|
|
cSize = lastBlock ?
|
|
ZSTD_compressEnd(zcs, cDst, oSize,
|
|
zcs->inBuff + zcs->inToCompress, iSize) :
|
|
ZSTD_compressContinue(zcs, cDst, oSize,
|
|
zcs->inBuff + zcs->inToCompress, iSize);
|
|
if (ZSTD_isError(cSize)) return cSize;
|
|
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",
|
|
(U32)zcs->inBuffTarget, (U32)zcs->inBuffSize);
|
|
if (!lastBlock)
|
|
assert(zcs->inBuffTarget <= zcs->inBuffSize);
|
|
zcs->inToCompress = zcs->inBuffPos;
|
|
if (cDst == op) { /* no need to flush */
|
|
op += cSize;
|
|
if (zcs->frameEnded) {
|
|
DEBUGLOG(5, "Frame completed directly in outBuffer");
|
|
someMoreWork = 0;
|
|
ZSTD_startNewCompression(zcs);
|
|
}
|
|
break;
|
|
}
|
|
zcs->outBuffContentSize = cSize;
|
|
zcs->outBuffFlushedSize = 0;
|
|
zcs->streamStage = zcss_flush; /* pass-through to flush stage */
|
|
}
|
|
/* fall-through */
|
|
case zcss_flush:
|
|
DEBUGLOG(5, "flush stage");
|
|
{ size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize;
|
|
size_t const flushed = ZSTD_limitCopy(op, oend-op,
|
|
zcs->outBuff + zcs->outBuffFlushedSize, toFlush);
|
|
DEBUGLOG(5, "toFlush: %u into %u ==> flushed: %u",
|
|
(U32)toFlush, (U32)(oend-op), (U32)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_startNewCompression(zcs);
|
|
break;
|
|
}
|
|
zcs->streamStage = zcss_load;
|
|
break;
|
|
}
|
|
|
|
default: /* impossible */
|
|
assert(0);
|
|
}
|
|
}
|
|
|
|
input->pos = ip - istart;
|
|
output->pos = op - ostart;
|
|
if (zcs->frameEnded) return 0;
|
|
{ size_t hintInSize = zcs->inBuffTarget - zcs->inBuffPos;
|
|
if (hintInSize==0) hintInSize = zcs->blockSize;
|
|
return hintInSize;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_compressStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
|
|
{
|
|
/* check conditions */
|
|
if (output->pos > output->size) return ERROR(GENERIC);
|
|
if (input->pos > input->size) return ERROR(GENERIC);
|
|
|
|
return ZSTD_compressStream_generic(zcs, output, input, ZSTD_e_continue);
|
|
}
|
|
|
|
|
|
size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
|
|
ZSTD_outBuffer* output,
|
|
ZSTD_inBuffer* input,
|
|
ZSTD_EndDirective endOp)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_compress_generic");
|
|
/* check conditions */
|
|
if (output->pos > output->size) return ERROR(GENERIC);
|
|
if (input->pos > input->size) return ERROR(GENERIC);
|
|
assert(cctx!=NULL);
|
|
|
|
/* transparent initialization stage */
|
|
if (cctx->streamStage == zcss_init) {
|
|
ZSTD_prefixDict const prefixDict = cctx->prefixDict;
|
|
ZSTD_CCtx_params params = cctx->requestedParams;
|
|
params.cParams = ZSTD_getCParamsFromCCtxParams(
|
|
cctx->requestedParams, cctx->pledgedSrcSizePlusOne-1, 0 /*dictSize*/);
|
|
memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); /* single usage */
|
|
assert(prefixDict.dict==NULL || cctx->cdict==NULL); /* only one can be set */
|
|
DEBUGLOG(4, "ZSTD_compress_generic : transparent init stage");
|
|
|
|
#ifdef ZSTD_MULTITHREAD
|
|
if (params.nbThreads > 1) {
|
|
if (cctx->mtctx == NULL || cctx->appliedParams.nbThreads != params.nbThreads) {
|
|
ZSTDMT_freeCCtx(cctx->mtctx);
|
|
cctx->mtctx = ZSTDMT_createCCtx_advanced(params.nbThreads, cctx->customMem);
|
|
if (cctx->mtctx == NULL) return ERROR(memory_allocation);
|
|
}
|
|
DEBUGLOG(4, "call ZSTDMT_initCStream_internal as nbThreads=%u", params.nbThreads);
|
|
CHECK_F( ZSTDMT_initCStream_internal(
|
|
cctx->mtctx,
|
|
prefixDict.dict, prefixDict.dictSize, ZSTD_dm_rawContent,
|
|
cctx->cdict, params, cctx->pledgedSrcSizePlusOne-1) );
|
|
cctx->streamStage = zcss_load;
|
|
cctx->appliedParams.nbThreads = params.nbThreads;
|
|
} else
|
|
#endif
|
|
{
|
|
CHECK_F( ZSTD_resetCStream_internal(
|
|
cctx, prefixDict.dict, prefixDict.dictSize,
|
|
prefixDict.dictMode, cctx->cdict, params,
|
|
cctx->pledgedSrcSizePlusOne-1) );
|
|
} }
|
|
|
|
/* compression stage */
|
|
#ifdef ZSTD_MULTITHREAD
|
|
if (cctx->appliedParams.nbThreads > 1) {
|
|
size_t const flushMin = ZSTDMT_compressStream_generic(cctx->mtctx, output, input, endOp);
|
|
DEBUGLOG(5, "ZSTDMT_compressStream_generic result : %u", (U32)flushMin);
|
|
if ( ZSTD_isError(flushMin)
|
|
|| (endOp == ZSTD_e_end && flushMin == 0) ) { /* compression completed */
|
|
ZSTD_startNewCompression(cctx);
|
|
}
|
|
return flushMin;
|
|
}
|
|
#endif
|
|
CHECK_F( ZSTD_compressStream_generic(cctx, output, input, endOp) );
|
|
DEBUGLOG(5, "completed ZSTD_compress_generic");
|
|
return cctx->outBuffContentSize - cctx->outBuffFlushedSize; /* remaining to flush */
|
|
}
|
|
|
|
size_t ZSTD_compress_generic_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 = { dst, dstCapacity, *dstPos };
|
|
ZSTD_inBuffer input = { src, srcSize, *srcPos };
|
|
/* ZSTD_compress_generic() will check validity of dstPos and srcPos */
|
|
size_t const cErr = ZSTD_compress_generic(cctx, &output, &input, endOp);
|
|
*dstPos = output.pos;
|
|
*srcPos = input.pos;
|
|
return cErr;
|
|
}
|
|
|
|
|
|
/*====== Finalize ======*/
|
|
|
|
/*! ZSTD_flushStream() :
|
|
* @return : amount of data remaining to flush */
|
|
size_t ZSTD_flushStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
|
|
{
|
|
ZSTD_inBuffer input = { NULL, 0, 0 };
|
|
if (output->pos > output->size) return ERROR(GENERIC);
|
|
CHECK_F( ZSTD_compressStream_generic(zcs, output, &input, ZSTD_e_flush) );
|
|
return zcs->outBuffContentSize - zcs->outBuffFlushedSize; /* remaining to flush */
|
|
}
|
|
|
|
|
|
size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
|
|
{
|
|
ZSTD_inBuffer input = { NULL, 0, 0 };
|
|
if (output->pos > output->size) return ERROR(GENERIC);
|
|
CHECK_F( ZSTD_compressStream_generic(zcs, output, &input, ZSTD_e_end) );
|
|
{ size_t const lastBlockSize = zcs->frameEnded ? 0 : ZSTD_BLOCKHEADERSIZE;
|
|
size_t const checksumSize = zcs->frameEnded ? 0 : zcs->appliedParams.fParams.checksumFlag * 4;
|
|
size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize + lastBlockSize + checksumSize;
|
|
DEBUGLOG(5, "ZSTD_endStream : remaining to flush : %u",
|
|
(unsigned)toFlush);
|
|
return toFlush;
|
|
}
|
|
}
|
|
|
|
|
|
/*-===== Pre-defined compression levels =====-*/
|
|
|
|
#define ZSTD_MAX_CLEVEL 22
|
|
int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }
|
|
|
|
static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEVEL+1] = {
|
|
{ /* "default" - guarantees a monotonically increasing memory budget */
|
|
/* W, C, H, S, L, TL, strat */
|
|
{ 18, 12, 12, 1, 7, 16, ZSTD_fast }, /* level 0 - never used */
|
|
{ 19, 13, 14, 1, 7, 16, ZSTD_fast }, /* level 1 */
|
|
{ 19, 15, 16, 1, 6, 16, ZSTD_fast }, /* level 2 */
|
|
{ 20, 16, 17, 1, 5, 16, ZSTD_dfast }, /* level 3 */
|
|
{ 20, 17, 18, 1, 5, 16, ZSTD_dfast }, /* level 4 */
|
|
{ 20, 17, 18, 2, 5, 16, ZSTD_greedy }, /* level 5 */
|
|
{ 21, 17, 19, 2, 5, 16, ZSTD_lazy }, /* level 6 */
|
|
{ 21, 18, 19, 3, 5, 16, ZSTD_lazy }, /* level 7 */
|
|
{ 21, 18, 20, 3, 5, 16, ZSTD_lazy2 }, /* level 8 */
|
|
{ 21, 19, 20, 3, 5, 16, ZSTD_lazy2 }, /* level 9 */
|
|
{ 21, 19, 21, 4, 5, 16, ZSTD_lazy2 }, /* level 10 */
|
|
{ 22, 20, 22, 4, 5, 16, ZSTD_lazy2 }, /* level 11 */
|
|
{ 22, 20, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 12 */
|
|
{ 22, 21, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 13 */
|
|
{ 22, 21, 22, 6, 5, 16, ZSTD_lazy2 }, /* level 14 */
|
|
{ 22, 21, 22, 5, 5, 16, ZSTD_btlazy2 }, /* level 15 */
|
|
{ 23, 22, 22, 5, 5, 16, ZSTD_btlazy2 }, /* level 16 */
|
|
{ 23, 22, 22, 4, 5, 24, ZSTD_btopt }, /* level 17 */
|
|
{ 23, 22, 22, 5, 4, 32, ZSTD_btopt }, /* level 18 */
|
|
{ 23, 23, 22, 6, 3, 48, ZSTD_btopt }, /* level 19 */
|
|
{ 25, 25, 23, 7, 3, 64, ZSTD_btultra }, /* level 20 */
|
|
{ 26, 26, 24, 7, 3,256, ZSTD_btultra }, /* level 21 */
|
|
{ 27, 27, 25, 9, 3,512, ZSTD_btultra }, /* level 22 */
|
|
},
|
|
{ /* for srcSize <= 256 KB */
|
|
/* W, C, H, S, L, T, strat */
|
|
{ 0, 0, 0, 0, 0, 0, ZSTD_fast }, /* level 0 - not used */
|
|
{ 18, 13, 14, 1, 6, 8, ZSTD_fast }, /* level 1 */
|
|
{ 18, 14, 13, 1, 5, 8, ZSTD_dfast }, /* level 2 */
|
|
{ 18, 16, 15, 1, 5, 8, ZSTD_dfast }, /* level 3 */
|
|
{ 18, 15, 17, 1, 5, 8, ZSTD_greedy }, /* level 4.*/
|
|
{ 18, 16, 17, 4, 5, 8, ZSTD_greedy }, /* level 5.*/
|
|
{ 18, 16, 17, 3, 5, 8, ZSTD_lazy }, /* level 6.*/
|
|
{ 18, 17, 17, 4, 4, 8, ZSTD_lazy }, /* level 7 */
|
|
{ 18, 17, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */
|
|
{ 18, 17, 17, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */
|
|
{ 18, 17, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */
|
|
{ 18, 18, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 11.*/
|
|
{ 18, 18, 17, 7, 4, 8, ZSTD_lazy2 }, /* level 12.*/
|
|
{ 18, 19, 17, 6, 4, 8, ZSTD_btlazy2 }, /* level 13 */
|
|
{ 18, 18, 18, 4, 4, 16, ZSTD_btopt }, /* level 14.*/
|
|
{ 18, 18, 18, 4, 3, 16, ZSTD_btopt }, /* level 15.*/
|
|
{ 18, 19, 18, 6, 3, 32, ZSTD_btopt }, /* level 16.*/
|
|
{ 18, 19, 18, 8, 3, 64, ZSTD_btopt }, /* level 17.*/
|
|
{ 18, 19, 18, 9, 3,128, ZSTD_btopt }, /* level 18.*/
|
|
{ 18, 19, 18, 10, 3,256, ZSTD_btopt }, /* level 19.*/
|
|
{ 18, 19, 18, 11, 3,512, ZSTD_btultra }, /* level 20.*/
|
|
{ 18, 19, 18, 12, 3,512, ZSTD_btultra }, /* level 21.*/
|
|
{ 18, 19, 18, 13, 3,512, ZSTD_btultra }, /* level 22.*/
|
|
},
|
|
{ /* for srcSize <= 128 KB */
|
|
/* W, C, H, S, L, T, strat */
|
|
{ 17, 12, 12, 1, 7, 8, ZSTD_fast }, /* level 0 - not used */
|
|
{ 17, 12, 13, 1, 6, 8, ZSTD_fast }, /* level 1 */
|
|
{ 17, 13, 16, 1, 5, 8, ZSTD_fast }, /* level 2 */
|
|
{ 17, 16, 16, 2, 5, 8, ZSTD_dfast }, /* level 3 */
|
|
{ 17, 13, 15, 3, 4, 8, ZSTD_greedy }, /* level 4 */
|
|
{ 17, 15, 17, 4, 4, 8, ZSTD_greedy }, /* level 5 */
|
|
{ 17, 16, 17, 3, 4, 8, ZSTD_lazy }, /* level 6 */
|
|
{ 17, 15, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 7 */
|
|
{ 17, 17, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */
|
|
{ 17, 17, 17, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */
|
|
{ 17, 17, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */
|
|
{ 17, 17, 17, 7, 4, 8, ZSTD_lazy2 }, /* level 11 */
|
|
{ 17, 17, 17, 8, 4, 8, ZSTD_lazy2 }, /* level 12 */
|
|
{ 17, 18, 17, 6, 4, 8, ZSTD_btlazy2 }, /* level 13.*/
|
|
{ 17, 17, 17, 7, 3, 8, ZSTD_btopt }, /* level 14.*/
|
|
{ 17, 17, 17, 7, 3, 16, ZSTD_btopt }, /* level 15.*/
|
|
{ 17, 18, 17, 7, 3, 32, ZSTD_btopt }, /* level 16.*/
|
|
{ 17, 18, 17, 7, 3, 64, ZSTD_btopt }, /* level 17.*/
|
|
{ 17, 18, 17, 7, 3,256, ZSTD_btopt }, /* level 18.*/
|
|
{ 17, 18, 17, 8, 3,256, ZSTD_btopt }, /* level 19.*/
|
|
{ 17, 18, 17, 9, 3,256, ZSTD_btultra }, /* level 20.*/
|
|
{ 17, 18, 17, 10, 3,256, ZSTD_btultra }, /* level 21.*/
|
|
{ 17, 18, 17, 11, 3,512, ZSTD_btultra }, /* level 22.*/
|
|
},
|
|
{ /* for srcSize <= 16 KB */
|
|
/* W, C, H, S, L, T, strat */
|
|
{ 14, 12, 12, 1, 7, 6, ZSTD_fast }, /* level 0 - not used */
|
|
{ 14, 14, 14, 1, 6, 6, ZSTD_fast }, /* level 1 */
|
|
{ 14, 14, 14, 1, 4, 6, ZSTD_fast }, /* level 2 */
|
|
{ 14, 14, 14, 1, 4, 6, ZSTD_dfast }, /* level 3.*/
|
|
{ 14, 14, 14, 4, 4, 6, ZSTD_greedy }, /* level 4.*/
|
|
{ 14, 14, 14, 3, 4, 6, ZSTD_lazy }, /* level 5.*/
|
|
{ 14, 14, 14, 4, 4, 6, ZSTD_lazy2 }, /* level 6 */
|
|
{ 14, 14, 14, 5, 4, 6, ZSTD_lazy2 }, /* level 7 */
|
|
{ 14, 14, 14, 6, 4, 6, ZSTD_lazy2 }, /* level 8.*/
|
|
{ 14, 15, 14, 6, 4, 6, ZSTD_btlazy2 }, /* level 9.*/
|
|
{ 14, 15, 14, 3, 3, 6, ZSTD_btopt }, /* level 10.*/
|
|
{ 14, 15, 14, 6, 3, 8, ZSTD_btopt }, /* level 11.*/
|
|
{ 14, 15, 14, 6, 3, 16, ZSTD_btopt }, /* level 12.*/
|
|
{ 14, 15, 14, 6, 3, 24, ZSTD_btopt }, /* level 13.*/
|
|
{ 14, 15, 15, 6, 3, 48, ZSTD_btopt }, /* level 14.*/
|
|
{ 14, 15, 15, 6, 3, 64, ZSTD_btopt }, /* level 15.*/
|
|
{ 14, 15, 15, 6, 3, 96, ZSTD_btopt }, /* level 16.*/
|
|
{ 14, 15, 15, 6, 3,128, ZSTD_btopt }, /* level 17.*/
|
|
{ 14, 15, 15, 6, 3,256, ZSTD_btopt }, /* level 18.*/
|
|
{ 14, 15, 15, 7, 3,256, ZSTD_btopt }, /* level 19.*/
|
|
{ 14, 15, 15, 8, 3,256, ZSTD_btultra }, /* level 20.*/
|
|
{ 14, 15, 15, 9, 3,256, ZSTD_btultra }, /* level 21.*/
|
|
{ 14, 15, 15, 10, 3,256, ZSTD_btultra }, /* level 22.*/
|
|
},
|
|
};
|
|
|
|
#if defined(ZSTD_DEBUG) && (ZSTD_DEBUG>=1)
|
|
/* This function just controls
|
|
* the monotonic memory budget increase of ZSTD_defaultCParameters[0].
|
|
* Run once, on first ZSTD_getCParams() usage, if ZSTD_DEBUG is enabled
|
|
*/
|
|
MEM_STATIC void ZSTD_check_compressionLevel_monotonicIncrease_memoryBudget(void)
|
|
{
|
|
int level;
|
|
for (level=1; level<ZSTD_maxCLevel(); level++) {
|
|
ZSTD_compressionParameters const c1 = ZSTD_defaultCParameters[0][level];
|
|
ZSTD_compressionParameters const c2 = ZSTD_defaultCParameters[0][level+1];
|
|
assert(c1.windowLog <= c2.windowLog);
|
|
# define ZSTD_TABLECOST(h,c) ((1<<(h)) + (1<<(c)))
|
|
assert(ZSTD_TABLECOST(c1.hashLog, c1.chainLog) <= ZSTD_TABLECOST(c2.hashLog, c2.chainLog));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*! 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)
|
|
{
|
|
size_t const addedSize = srcSizeHint ? 0 : 500;
|
|
U64 const rSize = srcSizeHint+dictSize ? srcSizeHint+dictSize+addedSize : (U64)-1;
|
|
U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB); /* intentional underflow for srcSizeHint == 0 */
|
|
|
|
#if defined(ZSTD_DEBUG) && (ZSTD_DEBUG>=1)
|
|
static int g_monotonicTest = 1;
|
|
if (g_monotonicTest) {
|
|
ZSTD_check_compressionLevel_monotonicIncrease_memoryBudget();
|
|
g_monotonicTest=0;
|
|
}
|
|
#endif
|
|
|
|
if (compressionLevel <= 0) compressionLevel = ZSTD_CLEVEL_DEFAULT; /* 0 == default; no negative compressionLevel yet */
|
|
if (compressionLevel > ZSTD_MAX_CLEVEL) compressionLevel = ZSTD_MAX_CLEVEL;
|
|
{ ZSTD_compressionParameters const cp = ZSTD_defaultCParameters[tableID][compressionLevel];
|
|
return ZSTD_adjustCParams_internal(cp, srcSizeHint, dictSize); }
|
|
|
|
}
|
|
|
|
/*! ZSTD_getParams() :
|
|
* same as ZSTD_getCParams(), but @return a `ZSTD_parameters` object (instead of `ZSTD_compressionParameters`).
|
|
* All fields of `ZSTD_frameParameters` are set to default (0) */
|
|
ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize) {
|
|
ZSTD_parameters params;
|
|
ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, srcSizeHint, dictSize);
|
|
memset(¶ms, 0, sizeof(params));
|
|
params.cParams = cParams;
|
|
return params;
|
|
}
|