summaryrefslogtreecommitdiffstats
path: root/src/zstd/lib/compress/zstd_compress.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 18:24:20 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 18:24:20 +0000
commit483eb2f56657e8e7f419ab1a4fab8dce9ade8609 (patch)
treee5d88d25d870d5dedacb6bbdbe2a966086a0a5cf /src/zstd/lib/compress/zstd_compress.c
parentInitial commit. (diff)
downloadceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.tar.xz
ceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.zip
Adding upstream version 14.2.21.upstream/14.2.21upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/zstd/lib/compress/zstd_compress.c')
-rw-r--r--src/zstd/lib/compress/zstd_compress.c3023
1 files changed, 3023 insertions, 0 deletions
diff --git a/src/zstd/lib/compress/zstd_compress.c b/src/zstd/lib/compress/zstd_compress.c
new file mode 100644
index 00000000..2c46c79f
--- /dev/null
+++ b/src/zstd/lib/compress/zstd_compress.c
@@ -0,0 +1,3023 @@
+/*
+ * 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(&params->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(&params);
+}
+
+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(&params);
+}
+
+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(&params.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(&params, 0, sizeof(params));
+ params.cParams = cParams;
+ return params;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 03:55:25 +0000