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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /lib/zstd/compress/zstd_compress.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/zstd/compress/zstd_compress.c')
-rw-r--r--lib/zstd/compress/zstd_compress.c5109
1 files changed, 5109 insertions, 0 deletions
diff --git a/lib/zstd/compress/zstd_compress.c b/lib/zstd/compress/zstd_compress.c
new file mode 100644
index 000000000..a4e916008
--- /dev/null
+++ b/lib/zstd/compress/zstd_compress.c
@@ -0,0 +1,5109 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/*-*************************************
+* Dependencies
+***************************************/
+#include "../common/zstd_deps.h" /* INT_MAX, ZSTD_memset, ZSTD_memcpy */
+#include "../common/cpu.h"
+#include "../common/mem.h"
+#include "hist.h" /* HIST_countFast_wksp */
+#define FSE_STATIC_LINKING_ONLY /* FSE_encodeSymbol */
+#include "../common/fse.h"
+#define HUF_STATIC_LINKING_ONLY
+#include "../common/huf.h"
+#include "zstd_compress_internal.h"
+#include "zstd_compress_sequences.h"
+#include "zstd_compress_literals.h"
+#include "zstd_fast.h"
+#include "zstd_double_fast.h"
+#include "zstd_lazy.h"
+#include "zstd_opt.h"
+#include "zstd_ldm.h"
+#include "zstd_compress_superblock.h"
+
+/* ***************************************************************
+* Tuning parameters
+*****************************************************************/
+/*!
+ * COMPRESS_HEAPMODE :
+ * Select how default decompression function ZSTD_compress() allocates its context,
+ * on stack (0, default), or into heap (1).
+ * Note that functions with explicit context such as ZSTD_compressCCtx() are unaffected.
+ */
+
+
+/*-*************************************
+* Helper functions
+***************************************/
+/* ZSTD_compressBound()
+ * Note that the result from this function is only compatible with the "normal"
+ * full-block strategy.
+ * When there are a lot of small blocks due to frequent flush in streaming mode
+ * the overhead of headers can make the compressed data to be larger than the
+ * return value of ZSTD_compressBound().
+ */
+size_t ZSTD_compressBound(size_t srcSize) {
+ return ZSTD_COMPRESSBOUND(srcSize);
+}
+
+
+/*-*************************************
+* Context memory management
+***************************************/
+struct ZSTD_CDict_s {
+ const void* dictContent;
+ size_t dictContentSize;
+ ZSTD_dictContentType_e dictContentType; /* The dictContentType the CDict was created with */
+ U32* entropyWorkspace; /* entropy workspace of HUF_WORKSPACE_SIZE bytes */
+ ZSTD_cwksp workspace;
+ ZSTD_matchState_t matchState;
+ ZSTD_compressedBlockState_t cBlockState;
+ ZSTD_customMem customMem;
+ U32 dictID;
+ int compressionLevel; /* 0 indicates that advanced API was used to select CDict params */
+}; /* typedef'd to ZSTD_CDict within "zstd.h" */
+
+ZSTD_CCtx* ZSTD_createCCtx(void)
+{
+ return ZSTD_createCCtx_advanced(ZSTD_defaultCMem);
+}
+
+static void ZSTD_initCCtx(ZSTD_CCtx* cctx, ZSTD_customMem memManager)
+{
+ assert(cctx != NULL);
+ ZSTD_memset(cctx, 0, sizeof(*cctx));
+ cctx->customMem = memManager;
+ cctx->bmi2 = ZSTD_cpuid_bmi2(ZSTD_cpuid());
+ { size_t const err = ZSTD_CCtx_reset(cctx, ZSTD_reset_parameters);
+ assert(!ZSTD_isError(err));
+ (void)err;
+ }
+}
+
+ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem)
+{
+ ZSTD_STATIC_ASSERT(zcss_init==0);
+ ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN==(0ULL - 1));
+ if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
+ { ZSTD_CCtx* const cctx = (ZSTD_CCtx*)ZSTD_customMalloc(sizeof(ZSTD_CCtx), customMem);
+ if (!cctx) return NULL;
+ ZSTD_initCCtx(cctx, customMem);
+ return cctx;
+ }
+}
+
+ZSTD_CCtx* ZSTD_initStaticCCtx(void* workspace, size_t workspaceSize)
+{
+ ZSTD_cwksp ws;
+ ZSTD_CCtx* cctx;
+ if (workspaceSize <= sizeof(ZSTD_CCtx)) return NULL; /* minimum size */
+ if ((size_t)workspace & 7) return NULL; /* must be 8-aligned */
+ ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_static_alloc);
+
+ cctx = (ZSTD_CCtx*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CCtx));
+ if (cctx == NULL) return NULL;
+
+ ZSTD_memset(cctx, 0, sizeof(ZSTD_CCtx));
+ ZSTD_cwksp_move(&cctx->workspace, &ws);
+ cctx->staticSize = workspaceSize;
+
+ /* statically sized space. entropyWorkspace never moves (but prev/next block swap places) */
+ if (!ZSTD_cwksp_check_available(&cctx->workspace, ENTROPY_WORKSPACE_SIZE + 2 * sizeof(ZSTD_compressedBlockState_t))) return NULL;
+ cctx->blockState.prevCBlock = (ZSTD_compressedBlockState_t*)ZSTD_cwksp_reserve_object(&cctx->workspace, sizeof(ZSTD_compressedBlockState_t));
+ cctx->blockState.nextCBlock = (ZSTD_compressedBlockState_t*)ZSTD_cwksp_reserve_object(&cctx->workspace, sizeof(ZSTD_compressedBlockState_t));
+ cctx->entropyWorkspace = (U32*)ZSTD_cwksp_reserve_object(&cctx->workspace, ENTROPY_WORKSPACE_SIZE);
+ cctx->bmi2 = ZSTD_cpuid_bmi2(ZSTD_cpuid());
+ return cctx;
+}
+
+/*
+ * Clears and frees all of the dictionaries in the CCtx.
+ */
+static void ZSTD_clearAllDicts(ZSTD_CCtx* cctx)
+{
+ ZSTD_customFree(cctx->localDict.dictBuffer, cctx->customMem);
+ ZSTD_freeCDict(cctx->localDict.cdict);
+ ZSTD_memset(&cctx->localDict, 0, sizeof(cctx->localDict));
+ ZSTD_memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict));
+ cctx->cdict = NULL;
+}
+
+static size_t ZSTD_sizeof_localDict(ZSTD_localDict dict)
+{
+ size_t const bufferSize = dict.dictBuffer != NULL ? dict.dictSize : 0;
+ size_t const cdictSize = ZSTD_sizeof_CDict(dict.cdict);
+ return bufferSize + cdictSize;
+}
+
+static void ZSTD_freeCCtxContent(ZSTD_CCtx* cctx)
+{
+ assert(cctx != NULL);
+ assert(cctx->staticSize == 0);
+ ZSTD_clearAllDicts(cctx);
+ ZSTD_cwksp_free(&cctx->workspace, cctx->customMem);
+}
+
+size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx)
+{
+ if (cctx==NULL) return 0; /* support free on NULL */
+ RETURN_ERROR_IF(cctx->staticSize, memory_allocation,
+ "not compatible with static CCtx");
+ {
+ int cctxInWorkspace = ZSTD_cwksp_owns_buffer(&cctx->workspace, cctx);
+ ZSTD_freeCCtxContent(cctx);
+ if (!cctxInWorkspace) {
+ ZSTD_customFree(cctx, cctx->customMem);
+ }
+ }
+ return 0;
+}
+
+
+static size_t ZSTD_sizeof_mtctx(const ZSTD_CCtx* cctx)
+{
+ (void)cctx;
+ return 0;
+}
+
+
+size_t ZSTD_sizeof_CCtx(const ZSTD_CCtx* cctx)
+{
+ if (cctx==NULL) return 0; /* support sizeof on NULL */
+ /* cctx may be in the workspace */
+ return (cctx->workspace.workspace == cctx ? 0 : sizeof(*cctx))
+ + ZSTD_cwksp_sizeof(&cctx->workspace)
+ + ZSTD_sizeof_localDict(cctx->localDict)
+ + ZSTD_sizeof_mtctx(cctx);
+}
+
+size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs)
+{
+ return ZSTD_sizeof_CCtx(zcs); /* same object */
+}
+
+/* private API call, for dictBuilder only */
+const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) { return &(ctx->seqStore); }
+
+/* Returns 1 if compression parameters are such that we should
+ * enable long distance matching (wlog >= 27, strategy >= btopt).
+ * Returns 0 otherwise.
+ */
+static U32 ZSTD_CParams_shouldEnableLdm(const ZSTD_compressionParameters* const cParams) {
+ return cParams->strategy >= ZSTD_btopt && cParams->windowLog >= 27;
+}
+
+static ZSTD_CCtx_params ZSTD_makeCCtxParamsFromCParams(
+ ZSTD_compressionParameters cParams)
+{
+ ZSTD_CCtx_params cctxParams;
+ /* should not matter, as all cParams are presumed properly defined */
+ ZSTD_CCtxParams_init(&cctxParams, ZSTD_CLEVEL_DEFAULT);
+ cctxParams.cParams = cParams;
+
+ if (ZSTD_CParams_shouldEnableLdm(&cParams)) {
+ DEBUGLOG(4, "ZSTD_makeCCtxParamsFromCParams(): Including LDM into cctx params");
+ cctxParams.ldmParams.enableLdm = 1;
+ /* LDM is enabled by default for optimal parser and window size >= 128MB */
+ ZSTD_ldm_adjustParameters(&cctxParams.ldmParams, &cParams);
+ assert(cctxParams.ldmParams.hashLog >= cctxParams.ldmParams.bucketSizeLog);
+ assert(cctxParams.ldmParams.hashRateLog < 32);
+ }
+
+ assert(!ZSTD_checkCParams(cParams));
+ return cctxParams;
+}
+
+static ZSTD_CCtx_params* ZSTD_createCCtxParams_advanced(
+ ZSTD_customMem customMem)
+{
+ ZSTD_CCtx_params* params;
+ if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
+ params = (ZSTD_CCtx_params*)ZSTD_customCalloc(
+ sizeof(ZSTD_CCtx_params), customMem);
+ if (!params) { return NULL; }
+ ZSTD_CCtxParams_init(params, ZSTD_CLEVEL_DEFAULT);
+ params->customMem = customMem;
+ return params;
+}
+
+ZSTD_CCtx_params* ZSTD_createCCtxParams(void)
+{
+ return ZSTD_createCCtxParams_advanced(ZSTD_defaultCMem);
+}
+
+size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params)
+{
+ if (params == NULL) { return 0; }
+ ZSTD_customFree(params, params->customMem);
+ return 0;
+}
+
+size_t ZSTD_CCtxParams_reset(ZSTD_CCtx_params* params)
+{
+ return ZSTD_CCtxParams_init(params, ZSTD_CLEVEL_DEFAULT);
+}
+
+size_t ZSTD_CCtxParams_init(ZSTD_CCtx_params* cctxParams, int compressionLevel) {
+ RETURN_ERROR_IF(!cctxParams, GENERIC, "NULL pointer!");
+ ZSTD_memset(cctxParams, 0, sizeof(*cctxParams));
+ cctxParams->compressionLevel = compressionLevel;
+ cctxParams->fParams.contentSizeFlag = 1;
+ return 0;
+}
+
+#define ZSTD_NO_CLEVEL 0
+
+/*
+ * Initializes the cctxParams from params and compressionLevel.
+ * @param compressionLevel If params are derived from a compression level then that compression level, otherwise ZSTD_NO_CLEVEL.
+ */
+static void ZSTD_CCtxParams_init_internal(ZSTD_CCtx_params* cctxParams, ZSTD_parameters const* params, int compressionLevel)
+{
+ assert(!ZSTD_checkCParams(params->cParams));
+ ZSTD_memset(cctxParams, 0, sizeof(*cctxParams));
+ cctxParams->cParams = params->cParams;
+ cctxParams->fParams = params->fParams;
+ /* Should not matter, as all cParams are presumed properly defined.
+ * But, set it for tracing anyway.
+ */
+ cctxParams->compressionLevel = compressionLevel;
+}
+
+size_t ZSTD_CCtxParams_init_advanced(ZSTD_CCtx_params* cctxParams, ZSTD_parameters params)
+{
+ RETURN_ERROR_IF(!cctxParams, GENERIC, "NULL pointer!");
+ FORWARD_IF_ERROR( ZSTD_checkCParams(params.cParams) , "");
+ ZSTD_CCtxParams_init_internal(cctxParams, &params, ZSTD_NO_CLEVEL);
+ return 0;
+}
+
+/*
+ * Sets cctxParams' cParams and fParams from params, but otherwise leaves them alone.
+ * @param param Validated zstd parameters.
+ */
+static void ZSTD_CCtxParams_setZstdParams(
+ ZSTD_CCtx_params* cctxParams, const ZSTD_parameters* params)
+{
+ assert(!ZSTD_checkCParams(params->cParams));
+ cctxParams->cParams = params->cParams;
+ cctxParams->fParams = params->fParams;
+ /* Should not matter, as all cParams are presumed properly defined.
+ * But, set it for tracing anyway.
+ */
+ cctxParams->compressionLevel = ZSTD_NO_CLEVEL;
+}
+
+ZSTD_bounds ZSTD_cParam_getBounds(ZSTD_cParameter param)
+{
+ ZSTD_bounds bounds = { 0, 0, 0 };
+
+ switch(param)
+ {
+ case ZSTD_c_compressionLevel:
+ bounds.lowerBound = ZSTD_minCLevel();
+ bounds.upperBound = ZSTD_maxCLevel();
+ return bounds;
+
+ case ZSTD_c_windowLog:
+ bounds.lowerBound = ZSTD_WINDOWLOG_MIN;
+ bounds.upperBound = ZSTD_WINDOWLOG_MAX;
+ return bounds;
+
+ case ZSTD_c_hashLog:
+ bounds.lowerBound = ZSTD_HASHLOG_MIN;
+ bounds.upperBound = ZSTD_HASHLOG_MAX;
+ return bounds;
+
+ case ZSTD_c_chainLog:
+ bounds.lowerBound = ZSTD_CHAINLOG_MIN;
+ bounds.upperBound = ZSTD_CHAINLOG_MAX;
+ return bounds;
+
+ case ZSTD_c_searchLog:
+ bounds.lowerBound = ZSTD_SEARCHLOG_MIN;
+ bounds.upperBound = ZSTD_SEARCHLOG_MAX;
+ return bounds;
+
+ case ZSTD_c_minMatch:
+ bounds.lowerBound = ZSTD_MINMATCH_MIN;
+ bounds.upperBound = ZSTD_MINMATCH_MAX;
+ return bounds;
+
+ case ZSTD_c_targetLength:
+ bounds.lowerBound = ZSTD_TARGETLENGTH_MIN;
+ bounds.upperBound = ZSTD_TARGETLENGTH_MAX;
+ return bounds;
+
+ case ZSTD_c_strategy:
+ bounds.lowerBound = ZSTD_STRATEGY_MIN;
+ bounds.upperBound = ZSTD_STRATEGY_MAX;
+ return bounds;
+
+ case ZSTD_c_contentSizeFlag:
+ bounds.lowerBound = 0;
+ bounds.upperBound = 1;
+ return bounds;
+
+ case ZSTD_c_checksumFlag:
+ bounds.lowerBound = 0;
+ bounds.upperBound = 1;
+ return bounds;
+
+ case ZSTD_c_dictIDFlag:
+ bounds.lowerBound = 0;
+ bounds.upperBound = 1;
+ return bounds;
+
+ case ZSTD_c_nbWorkers:
+ bounds.lowerBound = 0;
+ bounds.upperBound = 0;
+ return bounds;
+
+ case ZSTD_c_jobSize:
+ bounds.lowerBound = 0;
+ bounds.upperBound = 0;
+ return bounds;
+
+ case ZSTD_c_overlapLog:
+ bounds.lowerBound = 0;
+ bounds.upperBound = 0;
+ return bounds;
+
+ case ZSTD_c_enableDedicatedDictSearch:
+ bounds.lowerBound = 0;
+ bounds.upperBound = 1;
+ return bounds;
+
+ case ZSTD_c_enableLongDistanceMatching:
+ bounds.lowerBound = 0;
+ bounds.upperBound = 1;
+ return bounds;
+
+ case ZSTD_c_ldmHashLog:
+ bounds.lowerBound = ZSTD_LDM_HASHLOG_MIN;
+ bounds.upperBound = ZSTD_LDM_HASHLOG_MAX;
+ return bounds;
+
+ case ZSTD_c_ldmMinMatch:
+ bounds.lowerBound = ZSTD_LDM_MINMATCH_MIN;
+ bounds.upperBound = ZSTD_LDM_MINMATCH_MAX;
+ return bounds;
+
+ case ZSTD_c_ldmBucketSizeLog:
+ bounds.lowerBound = ZSTD_LDM_BUCKETSIZELOG_MIN;
+ bounds.upperBound = ZSTD_LDM_BUCKETSIZELOG_MAX;
+ return bounds;
+
+ case ZSTD_c_ldmHashRateLog:
+ bounds.lowerBound = ZSTD_LDM_HASHRATELOG_MIN;
+ bounds.upperBound = ZSTD_LDM_HASHRATELOG_MAX;
+ return bounds;
+
+ /* experimental parameters */
+ case ZSTD_c_rsyncable:
+ bounds.lowerBound = 0;
+ bounds.upperBound = 1;
+ return bounds;
+
+ case ZSTD_c_forceMaxWindow :
+ bounds.lowerBound = 0;
+ bounds.upperBound = 1;
+ return bounds;
+
+ case ZSTD_c_format:
+ ZSTD_STATIC_ASSERT(ZSTD_f_zstd1 < ZSTD_f_zstd1_magicless);
+ bounds.lowerBound = ZSTD_f_zstd1;
+ bounds.upperBound = ZSTD_f_zstd1_magicless; /* note : how to ensure at compile time that this is the highest value enum ? */
+ return bounds;
+
+ case ZSTD_c_forceAttachDict:
+ ZSTD_STATIC_ASSERT(ZSTD_dictDefaultAttach < ZSTD_dictForceLoad);
+ bounds.lowerBound = ZSTD_dictDefaultAttach;
+ bounds.upperBound = ZSTD_dictForceLoad; /* note : how to ensure at compile time that this is the highest value enum ? */
+ return bounds;
+
+ case ZSTD_c_literalCompressionMode:
+ ZSTD_STATIC_ASSERT(ZSTD_lcm_auto < ZSTD_lcm_huffman && ZSTD_lcm_huffman < ZSTD_lcm_uncompressed);
+ bounds.lowerBound = ZSTD_lcm_auto;
+ bounds.upperBound = ZSTD_lcm_uncompressed;
+ return bounds;
+
+ case ZSTD_c_targetCBlockSize:
+ bounds.lowerBound = ZSTD_TARGETCBLOCKSIZE_MIN;
+ bounds.upperBound = ZSTD_TARGETCBLOCKSIZE_MAX;
+ return bounds;
+
+ case ZSTD_c_srcSizeHint:
+ bounds.lowerBound = ZSTD_SRCSIZEHINT_MIN;
+ bounds.upperBound = ZSTD_SRCSIZEHINT_MAX;
+ return bounds;
+
+ case ZSTD_c_stableInBuffer:
+ case ZSTD_c_stableOutBuffer:
+ bounds.lowerBound = (int)ZSTD_bm_buffered;
+ bounds.upperBound = (int)ZSTD_bm_stable;
+ return bounds;
+
+ case ZSTD_c_blockDelimiters:
+ bounds.lowerBound = (int)ZSTD_sf_noBlockDelimiters;
+ bounds.upperBound = (int)ZSTD_sf_explicitBlockDelimiters;
+ return bounds;
+
+ case ZSTD_c_validateSequences:
+ bounds.lowerBound = 0;
+ bounds.upperBound = 1;
+ return bounds;
+
+ default:
+ bounds.error = ERROR(parameter_unsupported);
+ return bounds;
+ }
+}
+
+/* ZSTD_cParam_clampBounds:
+ * Clamps the value into the bounded range.
+ */
+static size_t ZSTD_cParam_clampBounds(ZSTD_cParameter cParam, int* value)
+{
+ ZSTD_bounds const bounds = ZSTD_cParam_getBounds(cParam);
+ if (ZSTD_isError(bounds.error)) return bounds.error;
+ if (*value < bounds.lowerBound) *value = bounds.lowerBound;
+ if (*value > bounds.upperBound) *value = bounds.upperBound;
+ return 0;
+}
+
+#define BOUNDCHECK(cParam, val) { \
+ RETURN_ERROR_IF(!ZSTD_cParam_withinBounds(cParam,val), \
+ parameter_outOfBound, "Param out of bounds"); \
+}
+
+
+static int ZSTD_isUpdateAuthorized(ZSTD_cParameter param)
+{
+ switch(param)
+ {
+ case ZSTD_c_compressionLevel:
+ case ZSTD_c_hashLog:
+ case ZSTD_c_chainLog:
+ case ZSTD_c_searchLog:
+ case ZSTD_c_minMatch:
+ case ZSTD_c_targetLength:
+ case ZSTD_c_strategy:
+ return 1;
+
+ case ZSTD_c_format:
+ case ZSTD_c_windowLog:
+ case ZSTD_c_contentSizeFlag:
+ case ZSTD_c_checksumFlag:
+ case ZSTD_c_dictIDFlag:
+ case ZSTD_c_forceMaxWindow :
+ case ZSTD_c_nbWorkers:
+ case ZSTD_c_jobSize:
+ case ZSTD_c_overlapLog:
+ case ZSTD_c_rsyncable:
+ case ZSTD_c_enableDedicatedDictSearch:
+ case ZSTD_c_enableLongDistanceMatching:
+ case ZSTD_c_ldmHashLog:
+ case ZSTD_c_ldmMinMatch:
+ case ZSTD_c_ldmBucketSizeLog:
+ case ZSTD_c_ldmHashRateLog:
+ case ZSTD_c_forceAttachDict:
+ case ZSTD_c_literalCompressionMode:
+ case ZSTD_c_targetCBlockSize:
+ case ZSTD_c_srcSizeHint:
+ case ZSTD_c_stableInBuffer:
+ case ZSTD_c_stableOutBuffer:
+ case ZSTD_c_blockDelimiters:
+ case ZSTD_c_validateSequences:
+ default:
+ return 0;
+ }
+}
+
+size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, int value)
+{
+ DEBUGLOG(4, "ZSTD_CCtx_setParameter (%i, %i)", (int)param, value);
+ if (cctx->streamStage != zcss_init) {
+ if (ZSTD_isUpdateAuthorized(param)) {
+ cctx->cParamsChanged = 1;
+ } else {
+ RETURN_ERROR(stage_wrong, "can only set params in ctx init stage");
+ } }
+
+ switch(param)
+ {
+ case ZSTD_c_nbWorkers:
+ RETURN_ERROR_IF((value!=0) && cctx->staticSize, parameter_unsupported,
+ "MT not compatible with static alloc");
+ break;
+
+ case ZSTD_c_compressionLevel:
+ case ZSTD_c_windowLog:
+ case ZSTD_c_hashLog:
+ case ZSTD_c_chainLog:
+ case ZSTD_c_searchLog:
+ case ZSTD_c_minMatch:
+ case ZSTD_c_targetLength:
+ case ZSTD_c_strategy:
+ case ZSTD_c_ldmHashRateLog:
+ case ZSTD_c_format:
+ case ZSTD_c_contentSizeFlag:
+ case ZSTD_c_checksumFlag:
+ case ZSTD_c_dictIDFlag:
+ case ZSTD_c_forceMaxWindow:
+ case ZSTD_c_forceAttachDict:
+ case ZSTD_c_literalCompressionMode:
+ case ZSTD_c_jobSize:
+ case ZSTD_c_overlapLog:
+ case ZSTD_c_rsyncable:
+ case ZSTD_c_enableDedicatedDictSearch:
+ case ZSTD_c_enableLongDistanceMatching:
+ case ZSTD_c_ldmHashLog:
+ case ZSTD_c_ldmMinMatch:
+ case ZSTD_c_ldmBucketSizeLog:
+ case ZSTD_c_targetCBlockSize:
+ case ZSTD_c_srcSizeHint:
+ case ZSTD_c_stableInBuffer:
+ case ZSTD_c_stableOutBuffer:
+ case ZSTD_c_blockDelimiters:
+ case ZSTD_c_validateSequences:
+ break;
+
+ default: RETURN_ERROR(parameter_unsupported, "unknown parameter");
+ }
+ return ZSTD_CCtxParams_setParameter(&cctx->requestedParams, param, value);
+}
+
+size_t ZSTD_CCtxParams_setParameter(ZSTD_CCtx_params* CCtxParams,
+ ZSTD_cParameter param, int value)
+{
+ DEBUGLOG(4, "ZSTD_CCtxParams_setParameter (%i, %i)", (int)param, value);
+ switch(param)
+ {
+ case ZSTD_c_format :
+ BOUNDCHECK(ZSTD_c_format, value);
+ CCtxParams->format = (ZSTD_format_e)value;
+ return (size_t)CCtxParams->format;
+
+ case ZSTD_c_compressionLevel : {
+ FORWARD_IF_ERROR(ZSTD_cParam_clampBounds(param, &value), "");
+ if (value == 0)
+ CCtxParams->compressionLevel = ZSTD_CLEVEL_DEFAULT; /* 0 == default */
+ else
+ CCtxParams->compressionLevel = value;
+ if (CCtxParams->compressionLevel >= 0) return (size_t)CCtxParams->compressionLevel;
+ return 0; /* return type (size_t) cannot represent negative values */
+ }
+
+ case ZSTD_c_windowLog :
+ if (value!=0) /* 0 => use default */
+ BOUNDCHECK(ZSTD_c_windowLog, value);
+ CCtxParams->cParams.windowLog = (U32)value;
+ return CCtxParams->cParams.windowLog;
+
+ case ZSTD_c_hashLog :
+ if (value!=0) /* 0 => use default */
+ BOUNDCHECK(ZSTD_c_hashLog, value);
+ CCtxParams->cParams.hashLog = (U32)value;
+ return CCtxParams->cParams.hashLog;
+
+ case ZSTD_c_chainLog :
+ if (value!=0) /* 0 => use default */
+ BOUNDCHECK(ZSTD_c_chainLog, value);
+ CCtxParams->cParams.chainLog = (U32)value;
+ return CCtxParams->cParams.chainLog;
+
+ case ZSTD_c_searchLog :
+ if (value!=0) /* 0 => use default */
+ BOUNDCHECK(ZSTD_c_searchLog, value);
+ CCtxParams->cParams.searchLog = (U32)value;
+ return (size_t)value;
+
+ case ZSTD_c_minMatch :
+ if (value!=0) /* 0 => use default */
+ BOUNDCHECK(ZSTD_c_minMatch, value);
+ CCtxParams->cParams.minMatch = value;
+ return CCtxParams->cParams.minMatch;
+
+ case ZSTD_c_targetLength :
+ BOUNDCHECK(ZSTD_c_targetLength, value);
+ CCtxParams->cParams.targetLength = value;
+ return CCtxParams->cParams.targetLength;
+
+ case ZSTD_c_strategy :
+ if (value!=0) /* 0 => use default */
+ BOUNDCHECK(ZSTD_c_strategy, value);
+ CCtxParams->cParams.strategy = (ZSTD_strategy)value;
+ return (size_t)CCtxParams->cParams.strategy;
+
+ case ZSTD_c_contentSizeFlag :
+ /* Content size written in frame header _when known_ (default:1) */
+ DEBUGLOG(4, "set content size flag = %u", (value!=0));
+ CCtxParams->fParams.contentSizeFlag = value != 0;
+ return CCtxParams->fParams.contentSizeFlag;
+
+ case ZSTD_c_checksumFlag :
+ /* A 32-bits content checksum will be calculated and written at end of frame (default:0) */
+ CCtxParams->fParams.checksumFlag = value != 0;
+ return CCtxParams->fParams.checksumFlag;
+
+ case ZSTD_c_dictIDFlag : /* When applicable, dictionary's dictID is provided in frame header (default:1) */
+ DEBUGLOG(4, "set dictIDFlag = %u", (value!=0));
+ CCtxParams->fParams.noDictIDFlag = !value;
+ return !CCtxParams->fParams.noDictIDFlag;
+
+ case ZSTD_c_forceMaxWindow :
+ CCtxParams->forceWindow = (value != 0);
+ return CCtxParams->forceWindow;
+
+ case ZSTD_c_forceAttachDict : {
+ const ZSTD_dictAttachPref_e pref = (ZSTD_dictAttachPref_e)value;
+ BOUNDCHECK(ZSTD_c_forceAttachDict, pref);
+ CCtxParams->attachDictPref = pref;
+ return CCtxParams->attachDictPref;
+ }
+
+ case ZSTD_c_literalCompressionMode : {
+ const ZSTD_literalCompressionMode_e lcm = (ZSTD_literalCompressionMode_e)value;
+ BOUNDCHECK(ZSTD_c_literalCompressionMode, lcm);
+ CCtxParams->literalCompressionMode = lcm;
+ return CCtxParams->literalCompressionMode;
+ }
+
+ case ZSTD_c_nbWorkers :
+ RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
+ return 0;
+
+ case ZSTD_c_jobSize :
+ RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
+ return 0;
+
+ case ZSTD_c_overlapLog :
+ RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
+ return 0;
+
+ case ZSTD_c_rsyncable :
+ RETURN_ERROR_IF(value!=0, parameter_unsupported, "not compiled with multithreading");
+ return 0;
+
+ case ZSTD_c_enableDedicatedDictSearch :
+ CCtxParams->enableDedicatedDictSearch = (value!=0);
+ return CCtxParams->enableDedicatedDictSearch;
+
+ case ZSTD_c_enableLongDistanceMatching :
+ CCtxParams->ldmParams.enableLdm = (value!=0);
+ return CCtxParams->ldmParams.enableLdm;
+
+ case ZSTD_c_ldmHashLog :
+ if (value!=0) /* 0 ==> auto */
+ BOUNDCHECK(ZSTD_c_ldmHashLog, value);
+ CCtxParams->ldmParams.hashLog = value;
+ return CCtxParams->ldmParams.hashLog;
+
+ case ZSTD_c_ldmMinMatch :
+ if (value!=0) /* 0 ==> default */
+ BOUNDCHECK(ZSTD_c_ldmMinMatch, value);
+ CCtxParams->ldmParams.minMatchLength = value;
+ return CCtxParams->ldmParams.minMatchLength;
+
+ case ZSTD_c_ldmBucketSizeLog :
+ if (value!=0) /* 0 ==> default */
+ BOUNDCHECK(ZSTD_c_ldmBucketSizeLog, value);
+ CCtxParams->ldmParams.bucketSizeLog = value;
+ return CCtxParams->ldmParams.bucketSizeLog;
+
+ case ZSTD_c_ldmHashRateLog :
+ if (value!=0) /* 0 ==> default */
+ BOUNDCHECK(ZSTD_c_ldmHashRateLog, value);
+ CCtxParams->ldmParams.hashRateLog = value;
+ return CCtxParams->ldmParams.hashRateLog;
+
+ case ZSTD_c_targetCBlockSize :
+ if (value!=0) /* 0 ==> default */
+ BOUNDCHECK(ZSTD_c_targetCBlockSize, value);
+ CCtxParams->targetCBlockSize = value;
+ return CCtxParams->targetCBlockSize;
+
+ case ZSTD_c_srcSizeHint :
+ if (value!=0) /* 0 ==> default */
+ BOUNDCHECK(ZSTD_c_srcSizeHint, value);
+ CCtxParams->srcSizeHint = value;
+ return CCtxParams->srcSizeHint;
+
+ case ZSTD_c_stableInBuffer:
+ BOUNDCHECK(ZSTD_c_stableInBuffer, value);
+ CCtxParams->inBufferMode = (ZSTD_bufferMode_e)value;
+ return CCtxParams->inBufferMode;
+
+ case ZSTD_c_stableOutBuffer:
+ BOUNDCHECK(ZSTD_c_stableOutBuffer, value);
+ CCtxParams->outBufferMode = (ZSTD_bufferMode_e)value;
+ return CCtxParams->outBufferMode;
+
+ case ZSTD_c_blockDelimiters:
+ BOUNDCHECK(ZSTD_c_blockDelimiters, value);
+ CCtxParams->blockDelimiters = (ZSTD_sequenceFormat_e)value;
+ return CCtxParams->blockDelimiters;
+
+ case ZSTD_c_validateSequences:
+ BOUNDCHECK(ZSTD_c_validateSequences, value);
+ CCtxParams->validateSequences = value;
+ return CCtxParams->validateSequences;
+
+ default: RETURN_ERROR(parameter_unsupported, "unknown parameter");
+ }
+}
+
+size_t ZSTD_CCtx_getParameter(ZSTD_CCtx const* cctx, ZSTD_cParameter param, int* value)
+{
+ return ZSTD_CCtxParams_getParameter(&cctx->requestedParams, param, value);
+}
+
+size_t ZSTD_CCtxParams_getParameter(
+ ZSTD_CCtx_params const* CCtxParams, ZSTD_cParameter param, int* value)
+{
+ switch(param)
+ {
+ case ZSTD_c_format :
+ *value = CCtxParams->format;
+ break;
+ case ZSTD_c_compressionLevel :
+ *value = CCtxParams->compressionLevel;
+ break;
+ case ZSTD_c_windowLog :
+ *value = (int)CCtxParams->cParams.windowLog;
+ break;
+ case ZSTD_c_hashLog :
+ *value = (int)CCtxParams->cParams.hashLog;
+ break;
+ case ZSTD_c_chainLog :
+ *value = (int)CCtxParams->cParams.chainLog;
+ break;
+ case ZSTD_c_searchLog :
+ *value = CCtxParams->cParams.searchLog;
+ break;
+ case ZSTD_c_minMatch :
+ *value = CCtxParams->cParams.minMatch;
+ break;
+ case ZSTD_c_targetLength :
+ *value = CCtxParams->cParams.targetLength;
+ break;
+ case ZSTD_c_strategy :
+ *value = (unsigned)CCtxParams->cParams.strategy;
+ break;
+ case ZSTD_c_contentSizeFlag :
+ *value = CCtxParams->fParams.contentSizeFlag;
+ break;
+ case ZSTD_c_checksumFlag :
+ *value = CCtxParams->fParams.checksumFlag;
+ break;
+ case ZSTD_c_dictIDFlag :
+ *value = !CCtxParams->fParams.noDictIDFlag;
+ break;
+ case ZSTD_c_forceMaxWindow :
+ *value = CCtxParams->forceWindow;
+ break;
+ case ZSTD_c_forceAttachDict :
+ *value = CCtxParams->attachDictPref;
+ break;
+ case ZSTD_c_literalCompressionMode :
+ *value = CCtxParams->literalCompressionMode;
+ break;
+ case ZSTD_c_nbWorkers :
+ assert(CCtxParams->nbWorkers == 0);
+ *value = CCtxParams->nbWorkers;
+ break;
+ case ZSTD_c_jobSize :
+ RETURN_ERROR(parameter_unsupported, "not compiled with multithreading");
+ case ZSTD_c_overlapLog :
+ RETURN_ERROR(parameter_unsupported, "not compiled with multithreading");
+ case ZSTD_c_rsyncable :
+ RETURN_ERROR(parameter_unsupported, "not compiled with multithreading");
+ case ZSTD_c_enableDedicatedDictSearch :
+ *value = CCtxParams->enableDedicatedDictSearch;
+ break;
+ case ZSTD_c_enableLongDistanceMatching :
+ *value = CCtxParams->ldmParams.enableLdm;
+ break;
+ case ZSTD_c_ldmHashLog :
+ *value = CCtxParams->ldmParams.hashLog;
+ break;
+ case ZSTD_c_ldmMinMatch :
+ *value = CCtxParams->ldmParams.minMatchLength;
+ break;
+ case ZSTD_c_ldmBucketSizeLog :
+ *value = CCtxParams->ldmParams.bucketSizeLog;
+ break;
+ case ZSTD_c_ldmHashRateLog :
+ *value = CCtxParams->ldmParams.hashRateLog;
+ break;
+ case ZSTD_c_targetCBlockSize :
+ *value = (int)CCtxParams->targetCBlockSize;
+ break;
+ case ZSTD_c_srcSizeHint :
+ *value = (int)CCtxParams->srcSizeHint;
+ break;
+ case ZSTD_c_stableInBuffer :
+ *value = (int)CCtxParams->inBufferMode;
+ break;
+ case ZSTD_c_stableOutBuffer :
+ *value = (int)CCtxParams->outBufferMode;
+ break;
+ case ZSTD_c_blockDelimiters :
+ *value = (int)CCtxParams->blockDelimiters;
+ break;
+ case ZSTD_c_validateSequences :
+ *value = (int)CCtxParams->validateSequences;
+ break;
+ default: RETURN_ERROR(parameter_unsupported, "unknown parameter");
+ }
+ return 0;
+}
+
+/* ZSTD_CCtx_setParametersUsingCCtxParams() :
+ * just applies `params` into `cctx`
+ * no action is performed, parameters are merely stored.
+ * If ZSTDMT is enabled, parameters are pushed to cctx->mtctx.
+ * This is possible even if a compression is ongoing.
+ * In which case, new parameters will be applied on the fly, starting with next compression job.
+ */
+size_t ZSTD_CCtx_setParametersUsingCCtxParams(
+ ZSTD_CCtx* cctx, const ZSTD_CCtx_params* params)
+{
+ DEBUGLOG(4, "ZSTD_CCtx_setParametersUsingCCtxParams");
+ RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
+ "The context is in the wrong stage!");
+ RETURN_ERROR_IF(cctx->cdict, stage_wrong,
+ "Can't override parameters with cdict attached (some must "
+ "be inherited from the cdict).");
+
+ cctx->requestedParams = *params;
+ return 0;
+}
+
+ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long long pledgedSrcSize)
+{
+ DEBUGLOG(4, "ZSTD_CCtx_setPledgedSrcSize to %u bytes", (U32)pledgedSrcSize);
+ RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
+ "Can't set pledgedSrcSize when not in init stage.");
+ cctx->pledgedSrcSizePlusOne = pledgedSrcSize+1;
+ return 0;
+}
+
+static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(
+ int const compressionLevel,
+ size_t const dictSize);
+static int ZSTD_dedicatedDictSearch_isSupported(
+ const ZSTD_compressionParameters* cParams);
+static void ZSTD_dedicatedDictSearch_revertCParams(
+ ZSTD_compressionParameters* cParams);
+
+/*
+ * Initializes the local dict using the requested parameters.
+ * NOTE: This does not use the pledged src size, because it may be used for more
+ * than one compression.
+ */
+static size_t ZSTD_initLocalDict(ZSTD_CCtx* cctx)
+{
+ ZSTD_localDict* const dl = &cctx->localDict;
+ if (dl->dict == NULL) {
+ /* No local dictionary. */
+ assert(dl->dictBuffer == NULL);
+ assert(dl->cdict == NULL);
+ assert(dl->dictSize == 0);
+ return 0;
+ }
+ if (dl->cdict != NULL) {
+ assert(cctx->cdict == dl->cdict);
+ /* Local dictionary already initialized. */
+ return 0;
+ }
+ assert(dl->dictSize > 0);
+ assert(cctx->cdict == NULL);
+ assert(cctx->prefixDict.dict == NULL);
+
+ dl->cdict = ZSTD_createCDict_advanced2(
+ dl->dict,
+ dl->dictSize,
+ ZSTD_dlm_byRef,
+ dl->dictContentType,
+ &cctx->requestedParams,
+ cctx->customMem);
+ RETURN_ERROR_IF(!dl->cdict, memory_allocation, "ZSTD_createCDict_advanced failed");
+ cctx->cdict = dl->cdict;
+ return 0;
+}
+
+size_t ZSTD_CCtx_loadDictionary_advanced(
+ ZSTD_CCtx* cctx, const void* dict, size_t dictSize,
+ ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictContentType_e dictContentType)
+{
+ RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
+ "Can't load a dictionary when ctx is not in init stage.");
+ DEBUGLOG(4, "ZSTD_CCtx_loadDictionary_advanced (size: %u)", (U32)dictSize);
+ ZSTD_clearAllDicts(cctx); /* in case one already exists */
+ if (dict == NULL || dictSize == 0) /* no dictionary mode */
+ return 0;
+ if (dictLoadMethod == ZSTD_dlm_byRef) {
+ cctx->localDict.dict = dict;
+ } else {
+ void* dictBuffer;
+ RETURN_ERROR_IF(cctx->staticSize, memory_allocation,
+ "no malloc for static CCtx");
+ dictBuffer = ZSTD_customMalloc(dictSize, cctx->customMem);
+ RETURN_ERROR_IF(!dictBuffer, memory_allocation, "NULL pointer!");
+ ZSTD_memcpy(dictBuffer, dict, dictSize);
+ cctx->localDict.dictBuffer = dictBuffer;
+ cctx->localDict.dict = dictBuffer;
+ }
+ cctx->localDict.dictSize = dictSize;
+ cctx->localDict.dictContentType = dictContentType;
+ 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_dct_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_dct_auto);
+}
+
+
+size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
+{
+ RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
+ "Can't ref a dict when ctx not in init stage.");
+ /* Free the existing local cdict (if any) to save memory. */
+ ZSTD_clearAllDicts(cctx);
+ cctx->cdict = cdict;
+ return 0;
+}
+
+size_t ZSTD_CCtx_refThreadPool(ZSTD_CCtx* cctx, ZSTD_threadPool* pool)
+{
+ RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
+ "Can't ref a pool when ctx not in init stage.");
+ cctx->pool = pool;
+ return 0;
+}
+
+size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize)
+{
+ return ZSTD_CCtx_refPrefix_advanced(cctx, prefix, prefixSize, ZSTD_dct_rawContent);
+}
+
+size_t ZSTD_CCtx_refPrefix_advanced(
+ ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize, ZSTD_dictContentType_e dictContentType)
+{
+ RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
+ "Can't ref a prefix when ctx not in init stage.");
+ ZSTD_clearAllDicts(cctx);
+ if (prefix != NULL && prefixSize > 0) {
+ cctx->prefixDict.dict = prefix;
+ cctx->prefixDict.dictSize = prefixSize;
+ cctx->prefixDict.dictContentType = dictContentType;
+ }
+ return 0;
+}
+
+/*! ZSTD_CCtx_reset() :
+ * Also dumps dictionary */
+size_t ZSTD_CCtx_reset(ZSTD_CCtx* cctx, ZSTD_ResetDirective reset)
+{
+ if ( (reset == ZSTD_reset_session_only)
+ || (reset == ZSTD_reset_session_and_parameters) ) {
+ cctx->streamStage = zcss_init;
+ cctx->pledgedSrcSizePlusOne = 0;
+ }
+ if ( (reset == ZSTD_reset_parameters)
+ || (reset == ZSTD_reset_session_and_parameters) ) {
+ RETURN_ERROR_IF(cctx->streamStage != zcss_init, stage_wrong,
+ "Can't reset parameters only when not in init stage.");
+ ZSTD_clearAllDicts(cctx);
+ return ZSTD_CCtxParams_reset(&cctx->requestedParams);
+ }
+ return 0;
+}
+
+
+/* ZSTD_checkCParams() :
+ control CParam values remain within authorized range.
+ @return : 0, or an error code if one value is beyond authorized range */
+size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams)
+{
+ BOUNDCHECK(ZSTD_c_windowLog, (int)cParams.windowLog);
+ BOUNDCHECK(ZSTD_c_chainLog, (int)cParams.chainLog);
+ BOUNDCHECK(ZSTD_c_hashLog, (int)cParams.hashLog);
+ BOUNDCHECK(ZSTD_c_searchLog, (int)cParams.searchLog);
+ BOUNDCHECK(ZSTD_c_minMatch, (int)cParams.minMatch);
+ BOUNDCHECK(ZSTD_c_targetLength,(int)cParams.targetLength);
+ BOUNDCHECK(ZSTD_c_strategy, cParams.strategy);
+ return 0;
+}
+
+/* ZSTD_clampCParams() :
+ * make CParam values within valid range.
+ * @return : valid CParams */
+static ZSTD_compressionParameters
+ZSTD_clampCParams(ZSTD_compressionParameters cParams)
+{
+# define CLAMP_TYPE(cParam, val, type) { \
+ ZSTD_bounds const bounds = ZSTD_cParam_getBounds(cParam); \
+ if ((int)val<bounds.lowerBound) val=(type)bounds.lowerBound; \
+ else if ((int)val>bounds.upperBound) val=(type)bounds.upperBound; \
+ }
+# define CLAMP(cParam, val) CLAMP_TYPE(cParam, val, unsigned)
+ CLAMP(ZSTD_c_windowLog, cParams.windowLog);
+ CLAMP(ZSTD_c_chainLog, cParams.chainLog);
+ CLAMP(ZSTD_c_hashLog, cParams.hashLog);
+ CLAMP(ZSTD_c_searchLog, cParams.searchLog);
+ CLAMP(ZSTD_c_minMatch, cParams.minMatch);
+ CLAMP(ZSTD_c_targetLength,cParams.targetLength);
+ CLAMP_TYPE(ZSTD_c_strategy,cParams.strategy, ZSTD_strategy);
+ return cParams;
+}
+
+/* ZSTD_cycleLog() :
+ * condition for correct operation : hashLog > 1 */
+U32 ZSTD_cycleLog(U32 hashLog, ZSTD_strategy strat)
+{
+ U32 const btScale = ((U32)strat >= (U32)ZSTD_btlazy2);
+ return hashLog - btScale;
+}
+
+/* ZSTD_dictAndWindowLog() :
+ * Returns an adjusted window log that is large enough to fit the source and the dictionary.
+ * The zstd format says that the entire dictionary is valid if one byte of the dictionary
+ * is within the window. So the hashLog and chainLog should be large enough to reference both
+ * the dictionary and the window. So we must use this adjusted dictAndWindowLog when downsizing
+ * the hashLog and windowLog.
+ * NOTE: srcSize must not be ZSTD_CONTENTSIZE_UNKNOWN.
+ */
+static U32 ZSTD_dictAndWindowLog(U32 windowLog, U64 srcSize, U64 dictSize)
+{
+ const U64 maxWindowSize = 1ULL << ZSTD_WINDOWLOG_MAX;
+ /* No dictionary ==> No change */
+ if (dictSize == 0) {
+ return windowLog;
+ }
+ assert(windowLog <= ZSTD_WINDOWLOG_MAX);
+ assert(srcSize != ZSTD_CONTENTSIZE_UNKNOWN); /* Handled in ZSTD_adjustCParams_internal() */
+ {
+ U64 const windowSize = 1ULL << windowLog;
+ U64 const dictAndWindowSize = dictSize + windowSize;
+ /* If the window size is already large enough to fit both the source and the dictionary
+ * then just use the window size. Otherwise adjust so that it fits the dictionary and
+ * the window.
+ */
+ if (windowSize >= dictSize + srcSize) {
+ return windowLog; /* Window size large enough already */
+ } else if (dictAndWindowSize >= maxWindowSize) {
+ return ZSTD_WINDOWLOG_MAX; /* Larger than max window log */
+ } else {
+ return ZSTD_highbit32((U32)dictAndWindowSize - 1) + 1;
+ }
+ }
+}
+
+/* ZSTD_adjustCParams_internal() :
+ * optimize `cPar` for a specified input (`srcSize` and `dictSize`).
+ * mostly downsize to reduce memory consumption and initialization latency.
+ * `srcSize` can be ZSTD_CONTENTSIZE_UNKNOWN when not known.
+ * `mode` is the mode for parameter adjustment. See docs for `ZSTD_cParamMode_e`.
+ * note : `srcSize==0` means 0!
+ * condition : cPar is presumed validated (can be checked using ZSTD_checkCParams()). */
+static ZSTD_compressionParameters
+ZSTD_adjustCParams_internal(ZSTD_compressionParameters cPar,
+ unsigned long long srcSize,
+ size_t dictSize,
+ ZSTD_cParamMode_e mode)
+{
+ const U64 minSrcSize = 513; /* (1<<9) + 1 */
+ const U64 maxWindowResize = 1ULL << (ZSTD_WINDOWLOG_MAX-1);
+ assert(ZSTD_checkCParams(cPar)==0);
+
+ switch (mode) {
+ case ZSTD_cpm_unknown:
+ case ZSTD_cpm_noAttachDict:
+ /* If we don't know the source size, don't make any
+ * assumptions about it. We will already have selected
+ * smaller parameters if a dictionary is in use.
+ */
+ break;
+ case ZSTD_cpm_createCDict:
+ /* Assume a small source size when creating a dictionary
+ * with an unkown source size.
+ */
+ if (dictSize && srcSize == ZSTD_CONTENTSIZE_UNKNOWN)
+ srcSize = minSrcSize;
+ break;
+ case ZSTD_cpm_attachDict:
+ /* Dictionary has its own dedicated parameters which have
+ * already been selected. We are selecting parameters
+ * for only the source.
+ */
+ dictSize = 0;
+ break;
+ default:
+ assert(0);
+ break;
+ }
+
+ /* resize windowLog if input is small enough, to use less memory */
+ if ( (srcSize < maxWindowResize)
+ && (dictSize < maxWindowResize) ) {
+ U32 const tSize = (U32)(srcSize + dictSize);
+ static U32 const hashSizeMin = 1 << ZSTD_HASHLOG_MIN;
+ U32 const srcLog = (tSize < hashSizeMin) ? ZSTD_HASHLOG_MIN :
+ ZSTD_highbit32(tSize-1) + 1;
+ if (cPar.windowLog > srcLog) cPar.windowLog = srcLog;
+ }
+ if (srcSize != ZSTD_CONTENTSIZE_UNKNOWN) {
+ U32 const dictAndWindowLog = ZSTD_dictAndWindowLog(cPar.windowLog, (U64)srcSize, (U64)dictSize);
+ U32 const cycleLog = ZSTD_cycleLog(cPar.chainLog, cPar.strategy);
+ if (cPar.hashLog > dictAndWindowLog+1) cPar.hashLog = dictAndWindowLog+1;
+ if (cycleLog > dictAndWindowLog)
+ cPar.chainLog -= (cycleLog - dictAndWindowLog);
+ }
+
+ if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN)
+ cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* minimum wlog required for valid frame header */
+
+ return cPar;
+}
+
+ZSTD_compressionParameters
+ZSTD_adjustCParams(ZSTD_compressionParameters cPar,
+ unsigned long long srcSize,
+ size_t dictSize)
+{
+ cPar = ZSTD_clampCParams(cPar); /* resulting cPar is necessarily valid (all parameters within range) */
+ if (srcSize == 0) srcSize = ZSTD_CONTENTSIZE_UNKNOWN;
+ return ZSTD_adjustCParams_internal(cPar, srcSize, dictSize, ZSTD_cpm_unknown);
+}
+
+static ZSTD_compressionParameters ZSTD_getCParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode);
+static ZSTD_parameters ZSTD_getParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode);
+
+static void ZSTD_overrideCParams(
+ ZSTD_compressionParameters* cParams,
+ const ZSTD_compressionParameters* overrides)
+{
+ if (overrides->windowLog) cParams->windowLog = overrides->windowLog;
+ if (overrides->hashLog) cParams->hashLog = overrides->hashLog;
+ if (overrides->chainLog) cParams->chainLog = overrides->chainLog;
+ if (overrides->searchLog) cParams->searchLog = overrides->searchLog;
+ if (overrides->minMatch) cParams->minMatch = overrides->minMatch;
+ if (overrides->targetLength) cParams->targetLength = overrides->targetLength;
+ if (overrides->strategy) cParams->strategy = overrides->strategy;
+}
+
+ZSTD_compressionParameters ZSTD_getCParamsFromCCtxParams(
+ const ZSTD_CCtx_params* CCtxParams, U64 srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode)
+{
+ ZSTD_compressionParameters cParams;
+ if (srcSizeHint == ZSTD_CONTENTSIZE_UNKNOWN && CCtxParams->srcSizeHint > 0) {
+ srcSizeHint = CCtxParams->srcSizeHint;
+ }
+ cParams = ZSTD_getCParams_internal(CCtxParams->compressionLevel, srcSizeHint, dictSize, mode);
+ if (CCtxParams->ldmParams.enableLdm) cParams.windowLog = ZSTD_LDM_DEFAULT_WINDOW_LOG;
+ ZSTD_overrideCParams(&cParams, &CCtxParams->cParams);
+ assert(!ZSTD_checkCParams(cParams));
+ /* srcSizeHint == 0 means 0 */
+ return ZSTD_adjustCParams_internal(cParams, srcSizeHint, dictSize, mode);
+}
+
+static size_t
+ZSTD_sizeof_matchState(const ZSTD_compressionParameters* const cParams,
+ const U32 forCCtx)
+{
+ 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 = (forCCtx && cParams->minMatch==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
+ size_t const h3Size = hashLog3 ? ((size_t)1) << hashLog3 : 0;
+ /* We don't use ZSTD_cwksp_alloc_size() here because the tables aren't
+ * surrounded by redzones in ASAN. */
+ size_t const tableSpace = chainSize * sizeof(U32)
+ + hSize * sizeof(U32)
+ + h3Size * sizeof(U32);
+ size_t const optPotentialSpace =
+ ZSTD_cwksp_alloc_size((MaxML+1) * sizeof(U32))
+ + ZSTD_cwksp_alloc_size((MaxLL+1) * sizeof(U32))
+ + ZSTD_cwksp_alloc_size((MaxOff+1) * sizeof(U32))
+ + ZSTD_cwksp_alloc_size((1<<Litbits) * sizeof(U32))
+ + ZSTD_cwksp_alloc_size((ZSTD_OPT_NUM+1) * sizeof(ZSTD_match_t))
+ + ZSTD_cwksp_alloc_size((ZSTD_OPT_NUM+1) * sizeof(ZSTD_optimal_t));
+ size_t const optSpace = (forCCtx && (cParams->strategy >= ZSTD_btopt))
+ ? optPotentialSpace
+ : 0;
+ DEBUGLOG(4, "chainSize: %u - hSize: %u - h3Size: %u",
+ (U32)chainSize, (U32)hSize, (U32)h3Size);
+ return tableSpace + optSpace;
+}
+
+static size_t ZSTD_estimateCCtxSize_usingCCtxParams_internal(
+ const ZSTD_compressionParameters* cParams,
+ const ldmParams_t* ldmParams,
+ const int isStatic,
+ const size_t buffInSize,
+ const size_t buffOutSize,
+ const U64 pledgedSrcSize)
+{
+ size_t const windowSize = MAX(1, (size_t)MIN(((U64)1 << cParams->windowLog), pledgedSrcSize));
+ size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, windowSize);
+ U32 const divider = (cParams->minMatch==3) ? 3 : 4;
+ size_t const maxNbSeq = blockSize / divider;
+ size_t const tokenSpace = ZSTD_cwksp_alloc_size(WILDCOPY_OVERLENGTH + blockSize)
+ + ZSTD_cwksp_alloc_size(maxNbSeq * sizeof(seqDef))
+ + 3 * ZSTD_cwksp_alloc_size(maxNbSeq * sizeof(BYTE));
+ size_t const entropySpace = ZSTD_cwksp_alloc_size(ENTROPY_WORKSPACE_SIZE);
+ size_t const blockStateSpace = 2 * ZSTD_cwksp_alloc_size(sizeof(ZSTD_compressedBlockState_t));
+ size_t const matchStateSize = ZSTD_sizeof_matchState(cParams, /* forCCtx */ 1);
+
+ size_t const ldmSpace = ZSTD_ldm_getTableSize(*ldmParams);
+ size_t const maxNbLdmSeq = ZSTD_ldm_getMaxNbSeq(*ldmParams, blockSize);
+ size_t const ldmSeqSpace = ldmParams->enableLdm ?
+ ZSTD_cwksp_alloc_size(maxNbLdmSeq * sizeof(rawSeq)) : 0;
+
+
+ size_t const bufferSpace = ZSTD_cwksp_alloc_size(buffInSize)
+ + ZSTD_cwksp_alloc_size(buffOutSize);
+
+ size_t const cctxSpace = isStatic ? ZSTD_cwksp_alloc_size(sizeof(ZSTD_CCtx)) : 0;
+
+ size_t const neededSpace =
+ cctxSpace +
+ entropySpace +
+ blockStateSpace +
+ ldmSpace +
+ ldmSeqSpace +
+ matchStateSize +
+ tokenSpace +
+ bufferSpace;
+
+ DEBUGLOG(5, "estimate workspace : %u", (U32)neededSpace);
+ return neededSpace;
+}
+
+size_t ZSTD_estimateCCtxSize_usingCCtxParams(const ZSTD_CCtx_params* params)
+{
+ ZSTD_compressionParameters const cParams =
+ ZSTD_getCParamsFromCCtxParams(params, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict);
+
+ RETURN_ERROR_IF(params->nbWorkers > 0, GENERIC, "Estimate CCtx size is supported for single-threaded compression only.");
+ /* estimateCCtxSize is for one-shot compression. So no buffers should
+ * be needed. However, we still allocate two 0-sized buffers, which can
+ * take space under ASAN. */
+ return ZSTD_estimateCCtxSize_usingCCtxParams_internal(
+ &cParams, &params->ldmParams, 1, 0, 0, ZSTD_CONTENTSIZE_UNKNOWN);
+}
+
+size_t ZSTD_estimateCCtxSize_usingCParams(ZSTD_compressionParameters cParams)
+{
+ ZSTD_CCtx_params const params = ZSTD_makeCCtxParamsFromCParams(cParams);
+ return ZSTD_estimateCCtxSize_usingCCtxParams(&params);
+}
+
+static size_t ZSTD_estimateCCtxSize_internal(int compressionLevel)
+{
+ int tier = 0;
+ size_t largestSize = 0;
+ static const unsigned long long srcSizeTiers[4] = {16 KB, 128 KB, 256 KB, ZSTD_CONTENTSIZE_UNKNOWN};
+ for (; tier < 4; ++tier) {
+ /* Choose the set of cParams for a given level across all srcSizes that give the largest cctxSize */
+ ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, srcSizeTiers[tier], 0, ZSTD_cpm_noAttachDict);
+ largestSize = MAX(ZSTD_estimateCCtxSize_usingCParams(cParams), largestSize);
+ }
+ return largestSize;
+}
+
+size_t ZSTD_estimateCCtxSize(int compressionLevel)
+{
+ int level;
+ size_t memBudget = 0;
+ for (level=MIN(compressionLevel, 1); level<=compressionLevel; level++) {
+ /* Ensure monotonically increasing memory usage as compression level increases */
+ size_t const newMB = ZSTD_estimateCCtxSize_internal(level);
+ if (newMB > memBudget) memBudget = newMB;
+ }
+ return memBudget;
+}
+
+size_t ZSTD_estimateCStreamSize_usingCCtxParams(const ZSTD_CCtx_params* params)
+{
+ RETURN_ERROR_IF(params->nbWorkers > 0, GENERIC, "Estimate CCtx size is supported for single-threaded compression only.");
+ { ZSTD_compressionParameters const cParams =
+ ZSTD_getCParamsFromCCtxParams(params, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict);
+ size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << cParams.windowLog);
+ size_t const inBuffSize = (params->inBufferMode == ZSTD_bm_buffered)
+ ? ((size_t)1 << cParams.windowLog) + blockSize
+ : 0;
+ size_t const outBuffSize = (params->outBufferMode == ZSTD_bm_buffered)
+ ? ZSTD_compressBound(blockSize) + 1
+ : 0;
+
+ return ZSTD_estimateCCtxSize_usingCCtxParams_internal(
+ &cParams, &params->ldmParams, 1, inBuffSize, outBuffSize,
+ ZSTD_CONTENTSIZE_UNKNOWN);
+ }
+}
+
+size_t ZSTD_estimateCStreamSize_usingCParams(ZSTD_compressionParameters cParams)
+{
+ ZSTD_CCtx_params const params = ZSTD_makeCCtxParamsFromCParams(cParams);
+ return ZSTD_estimateCStreamSize_usingCCtxParams(&params);
+}
+
+static size_t ZSTD_estimateCStreamSize_internal(int compressionLevel)
+{
+ ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_cpm_noAttachDict);
+ return ZSTD_estimateCStreamSize_usingCParams(cParams);
+}
+
+size_t ZSTD_estimateCStreamSize(int compressionLevel)
+{
+ int level;
+ size_t memBudget = 0;
+ for (level=MIN(compressionLevel, 1); level<=compressionLevel; level++) {
+ size_t const newMB = ZSTD_estimateCStreamSize_internal(level);
+ if (newMB > memBudget) memBudget = newMB;
+ }
+ return memBudget;
+}
+
+/* ZSTD_getFrameProgression():
+ * tells how much data has been consumed (input) and produced (output) for current frame.
+ * able to count progression inside worker threads (non-blocking mode).
+ */
+ZSTD_frameProgression ZSTD_getFrameProgression(const ZSTD_CCtx* cctx)
+{
+ { ZSTD_frameProgression fp;
+ size_t const buffered = (cctx->inBuff == NULL) ? 0 :
+ cctx->inBuffPos - cctx->inToCompress;
+ if (buffered) assert(cctx->inBuffPos >= cctx->inToCompress);
+ assert(buffered <= ZSTD_BLOCKSIZE_MAX);
+ fp.ingested = cctx->consumedSrcSize + buffered;
+ fp.consumed = cctx->consumedSrcSize;
+ fp.produced = cctx->producedCSize;
+ fp.flushed = cctx->producedCSize; /* simplified; some data might still be left within streaming output buffer */
+ fp.currentJobID = 0;
+ fp.nbActiveWorkers = 0;
+ return fp;
+} }
+
+/*! ZSTD_toFlushNow()
+ * Only useful for multithreading scenarios currently (nbWorkers >= 1).
+ */
+size_t ZSTD_toFlushNow(ZSTD_CCtx* cctx)
+{
+ (void)cctx;
+ return 0; /* over-simplification; could also check if context is currently running in streaming mode, and in which case, report how many bytes are left to be flushed within output buffer */
+}
+
+static void ZSTD_assertEqualCParams(ZSTD_compressionParameters cParams1,
+ ZSTD_compressionParameters cParams2)
+{
+ (void)cParams1;
+ (void)cParams2;
+ assert(cParams1.windowLog == cParams2.windowLog);
+ assert(cParams1.chainLog == cParams2.chainLog);
+ assert(cParams1.hashLog == cParams2.hashLog);
+ assert(cParams1.searchLog == cParams2.searchLog);
+ assert(cParams1.minMatch == cParams2.minMatch);
+ assert(cParams1.targetLength == cParams2.targetLength);
+ assert(cParams1.strategy == cParams2.strategy);
+}
+
+void ZSTD_reset_compressedBlockState(ZSTD_compressedBlockState_t* bs)
+{
+ int i;
+ for (i = 0; i < ZSTD_REP_NUM; ++i)
+ bs->rep[i] = repStartValue[i];
+ bs->entropy.huf.repeatMode = HUF_repeat_none;
+ bs->entropy.fse.offcode_repeatMode = FSE_repeat_none;
+ bs->entropy.fse.matchlength_repeatMode = FSE_repeat_none;
+ bs->entropy.fse.litlength_repeatMode = FSE_repeat_none;
+}
+
+/*! ZSTD_invalidateMatchState()
+ * Invalidate all the matches in the match finder tables.
+ * Requires nextSrc and base to be set (can be NULL).
+ */
+static void ZSTD_invalidateMatchState(ZSTD_matchState_t* ms)
+{
+ ZSTD_window_clear(&ms->window);
+
+ ms->nextToUpdate = ms->window.dictLimit;
+ ms->loadedDictEnd = 0;
+ ms->opt.litLengthSum = 0; /* force reset of btopt stats */
+ ms->dictMatchState = NULL;
+}
+
+/*
+ * Controls, for this matchState reset, whether the tables need to be cleared /
+ * prepared for the coming compression (ZSTDcrp_makeClean), or whether the
+ * tables can be left unclean (ZSTDcrp_leaveDirty), because we know that a
+ * subsequent operation will overwrite the table space anyways (e.g., copying
+ * the matchState contents in from a CDict).
+ */
+typedef enum {
+ ZSTDcrp_makeClean,
+ ZSTDcrp_leaveDirty
+} ZSTD_compResetPolicy_e;
+
+/*
+ * Controls, for this matchState reset, whether indexing can continue where it
+ * left off (ZSTDirp_continue), or whether it needs to be restarted from zero
+ * (ZSTDirp_reset).
+ */
+typedef enum {
+ ZSTDirp_continue,
+ ZSTDirp_reset
+} ZSTD_indexResetPolicy_e;
+
+typedef enum {
+ ZSTD_resetTarget_CDict,
+ ZSTD_resetTarget_CCtx
+} ZSTD_resetTarget_e;
+
+static size_t
+ZSTD_reset_matchState(ZSTD_matchState_t* ms,
+ ZSTD_cwksp* ws,
+ const ZSTD_compressionParameters* cParams,
+ const ZSTD_compResetPolicy_e crp,
+ const ZSTD_indexResetPolicy_e forceResetIndex,
+ const ZSTD_resetTarget_e forWho)
+{
+ 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 = ((forWho == ZSTD_resetTarget_CCtx) && cParams->minMatch==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
+ size_t const h3Size = hashLog3 ? ((size_t)1) << hashLog3 : 0;
+
+ DEBUGLOG(4, "reset indices : %u", forceResetIndex == ZSTDirp_reset);
+ if (forceResetIndex == ZSTDirp_reset) {
+ ZSTD_window_init(&ms->window);
+ ZSTD_cwksp_mark_tables_dirty(ws);
+ }
+
+ ms->hashLog3 = hashLog3;
+
+ ZSTD_invalidateMatchState(ms);
+
+ assert(!ZSTD_cwksp_reserve_failed(ws)); /* check that allocation hasn't already failed */
+
+ ZSTD_cwksp_clear_tables(ws);
+
+ DEBUGLOG(5, "reserving table space");
+ /* table Space */
+ ms->hashTable = (U32*)ZSTD_cwksp_reserve_table(ws, hSize * sizeof(U32));
+ ms->chainTable = (U32*)ZSTD_cwksp_reserve_table(ws, chainSize * sizeof(U32));
+ ms->hashTable3 = (U32*)ZSTD_cwksp_reserve_table(ws, h3Size * sizeof(U32));
+ RETURN_ERROR_IF(ZSTD_cwksp_reserve_failed(ws), memory_allocation,
+ "failed a workspace allocation in ZSTD_reset_matchState");
+
+ DEBUGLOG(4, "reset table : %u", crp!=ZSTDcrp_leaveDirty);
+ if (crp!=ZSTDcrp_leaveDirty) {
+ /* reset tables only */
+ ZSTD_cwksp_clean_tables(ws);
+ }
+
+ /* opt parser space */
+ if ((forWho == ZSTD_resetTarget_CCtx) && (cParams->strategy >= ZSTD_btopt)) {
+ DEBUGLOG(4, "reserving optimal parser space");
+ ms->opt.litFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (1<<Litbits) * sizeof(unsigned));
+ ms->opt.litLengthFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxLL+1) * sizeof(unsigned));
+ ms->opt.matchLengthFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxML+1) * sizeof(unsigned));
+ ms->opt.offCodeFreq = (unsigned*)ZSTD_cwksp_reserve_aligned(ws, (MaxOff+1) * sizeof(unsigned));
+ ms->opt.matchTable = (ZSTD_match_t*)ZSTD_cwksp_reserve_aligned(ws, (ZSTD_OPT_NUM+1) * sizeof(ZSTD_match_t));
+ ms->opt.priceTable = (ZSTD_optimal_t*)ZSTD_cwksp_reserve_aligned(ws, (ZSTD_OPT_NUM+1) * sizeof(ZSTD_optimal_t));
+ }
+
+ ms->cParams = *cParams;
+
+ RETURN_ERROR_IF(ZSTD_cwksp_reserve_failed(ws), memory_allocation,
+ "failed a workspace allocation in ZSTD_reset_matchState");
+
+ return 0;
+}
+
+/* ZSTD_indexTooCloseToMax() :
+ * minor optimization : prefer memset() rather than reduceIndex()
+ * which is measurably slow in some circumstances (reported for Visual Studio).
+ * Works when re-using a context for a lot of smallish inputs :
+ * if all inputs are smaller than ZSTD_INDEXOVERFLOW_MARGIN,
+ * memset() will be triggered before reduceIndex().
+ */
+#define ZSTD_INDEXOVERFLOW_MARGIN (16 MB)
+static int ZSTD_indexTooCloseToMax(ZSTD_window_t w)
+{
+ return (size_t)(w.nextSrc - w.base) > (ZSTD_CURRENT_MAX - ZSTD_INDEXOVERFLOW_MARGIN);
+}
+
+/*! ZSTD_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 const pledgedSrcSize,
+ ZSTD_compResetPolicy_e const crp,
+ ZSTD_buffered_policy_e const zbuff)
+{
+ ZSTD_cwksp* const ws = &zc->workspace;
+ DEBUGLOG(4, "ZSTD_resetCCtx_internal: pledgedSrcSize=%u, wlog=%u",
+ (U32)pledgedSrcSize, params.cParams.windowLog);
+ assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
+
+ zc->isFirstBlock = 1;
+
+ if (params.ldmParams.enableLdm) {
+ /* Adjust long distance matching parameters */
+ ZSTD_ldm_adjustParameters(&params.ldmParams, &params.cParams);
+ assert(params.ldmParams.hashLog >= params.ldmParams.bucketSizeLog);
+ assert(params.ldmParams.hashRateLog < 32);
+ }
+
+ { size_t const windowSize = MAX(1, (size_t)MIN(((U64)1 << params.cParams.windowLog), pledgedSrcSize));
+ size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, windowSize);
+ U32 const divider = (params.cParams.minMatch==3) ? 3 : 4;
+ size_t const maxNbSeq = blockSize / divider;
+ size_t const buffOutSize = (zbuff == ZSTDb_buffered && params.outBufferMode == ZSTD_bm_buffered)
+ ? ZSTD_compressBound(blockSize) + 1
+ : 0;
+ size_t const buffInSize = (zbuff == ZSTDb_buffered && params.inBufferMode == ZSTD_bm_buffered)
+ ? windowSize + blockSize
+ : 0;
+ size_t const maxNbLdmSeq = ZSTD_ldm_getMaxNbSeq(params.ldmParams, blockSize);
+
+ int const indexTooClose = ZSTD_indexTooCloseToMax(zc->blockState.matchState.window);
+ ZSTD_indexResetPolicy_e needsIndexReset =
+ (!indexTooClose && zc->initialized) ? ZSTDirp_continue : ZSTDirp_reset;
+
+ size_t const neededSpace =
+ ZSTD_estimateCCtxSize_usingCCtxParams_internal(
+ &params.cParams, &params.ldmParams, zc->staticSize != 0,
+ buffInSize, buffOutSize, pledgedSrcSize);
+ FORWARD_IF_ERROR(neededSpace, "cctx size estimate failed!");
+
+ if (!zc->staticSize) ZSTD_cwksp_bump_oversized_duration(ws, 0);
+
+ /* Check if workspace is large enough, alloc a new one if needed */
+ {
+ int const workspaceTooSmall = ZSTD_cwksp_sizeof(ws) < neededSpace;
+ int const workspaceWasteful = ZSTD_cwksp_check_wasteful(ws, neededSpace);
+
+ DEBUGLOG(4, "Need %zu B workspace", neededSpace);
+ DEBUGLOG(4, "windowSize: %zu - blockSize: %zu", windowSize, blockSize);
+
+ if (workspaceTooSmall || workspaceWasteful) {
+ DEBUGLOG(4, "Resize workspaceSize from %zuKB to %zuKB",
+ ZSTD_cwksp_sizeof(ws) >> 10,
+ neededSpace >> 10);
+
+ RETURN_ERROR_IF(zc->staticSize, memory_allocation, "static cctx : no resize");
+
+ needsIndexReset = ZSTDirp_reset;
+
+ ZSTD_cwksp_free(ws, zc->customMem);
+ FORWARD_IF_ERROR(ZSTD_cwksp_create(ws, neededSpace, zc->customMem), "");
+
+ DEBUGLOG(5, "reserving object space");
+ /* Statically sized space.
+ * entropyWorkspace never moves,
+ * though prev/next block swap places */
+ assert(ZSTD_cwksp_check_available(ws, 2 * sizeof(ZSTD_compressedBlockState_t)));
+ zc->blockState.prevCBlock = (ZSTD_compressedBlockState_t*) ZSTD_cwksp_reserve_object(ws, sizeof(ZSTD_compressedBlockState_t));
+ RETURN_ERROR_IF(zc->blockState.prevCBlock == NULL, memory_allocation, "couldn't allocate prevCBlock");
+ zc->blockState.nextCBlock = (ZSTD_compressedBlockState_t*) ZSTD_cwksp_reserve_object(ws, sizeof(ZSTD_compressedBlockState_t));
+ RETURN_ERROR_IF(zc->blockState.nextCBlock == NULL, memory_allocation, "couldn't allocate nextCBlock");
+ zc->entropyWorkspace = (U32*) ZSTD_cwksp_reserve_object(ws, ENTROPY_WORKSPACE_SIZE);
+ RETURN_ERROR_IF(zc->blockState.nextCBlock == NULL, memory_allocation, "couldn't allocate entropyWorkspace");
+ } }
+
+ ZSTD_cwksp_clear(ws);
+
+ /* init params */
+ zc->appliedParams = params;
+ zc->blockState.matchState.cParams = params.cParams;
+ zc->pledgedSrcSizePlusOne = pledgedSrcSize+1;
+ zc->consumedSrcSize = 0;
+ zc->producedCSize = 0;
+ if (pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN)
+ zc->appliedParams.fParams.contentSizeFlag = 0;
+ DEBUGLOG(4, "pledged content size : %u ; flag : %u",
+ (unsigned)pledgedSrcSize, zc->appliedParams.fParams.contentSizeFlag);
+ zc->blockSize = blockSize;
+
+ xxh64_reset(&zc->xxhState, 0);
+ zc->stage = ZSTDcs_init;
+ zc->dictID = 0;
+ zc->dictContentSize = 0;
+
+ ZSTD_reset_compressedBlockState(zc->blockState.prevCBlock);
+
+ /* ZSTD_wildcopy() is used to copy into the literals buffer,
+ * so we have to oversize the buffer by WILDCOPY_OVERLENGTH bytes.
+ */
+ zc->seqStore.litStart = ZSTD_cwksp_reserve_buffer(ws, blockSize + WILDCOPY_OVERLENGTH);
+ zc->seqStore.maxNbLit = blockSize;
+
+ /* buffers */
+ zc->bufferedPolicy = zbuff;
+ zc->inBuffSize = buffInSize;
+ zc->inBuff = (char*)ZSTD_cwksp_reserve_buffer(ws, buffInSize);
+ zc->outBuffSize = buffOutSize;
+ zc->outBuff = (char*)ZSTD_cwksp_reserve_buffer(ws, buffOutSize);
+
+ /* ldm bucketOffsets table */
+ if (params.ldmParams.enableLdm) {
+ /* TODO: avoid memset? */
+ size_t const numBuckets =
+ ((size_t)1) << (params.ldmParams.hashLog -
+ params.ldmParams.bucketSizeLog);
+ zc->ldmState.bucketOffsets = ZSTD_cwksp_reserve_buffer(ws, numBuckets);
+ ZSTD_memset(zc->ldmState.bucketOffsets, 0, numBuckets);
+ }
+
+ /* sequences storage */
+ ZSTD_referenceExternalSequences(zc, NULL, 0);
+ zc->seqStore.maxNbSeq = maxNbSeq;
+ zc->seqStore.llCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
+ zc->seqStore.mlCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
+ zc->seqStore.ofCode = ZSTD_cwksp_reserve_buffer(ws, maxNbSeq * sizeof(BYTE));
+ zc->seqStore.sequencesStart = (seqDef*)ZSTD_cwksp_reserve_aligned(ws, maxNbSeq * sizeof(seqDef));
+
+ FORWARD_IF_ERROR(ZSTD_reset_matchState(
+ &zc->blockState.matchState,
+ ws,
+ &params.cParams,
+ crp,
+ needsIndexReset,
+ ZSTD_resetTarget_CCtx), "");
+
+ /* ldm hash table */
+ if (params.ldmParams.enableLdm) {
+ /* TODO: avoid memset? */
+ size_t const ldmHSize = ((size_t)1) << params.ldmParams.hashLog;
+ zc->ldmState.hashTable = (ldmEntry_t*)ZSTD_cwksp_reserve_aligned(ws, ldmHSize * sizeof(ldmEntry_t));
+ ZSTD_memset(zc->ldmState.hashTable, 0, ldmHSize * sizeof(ldmEntry_t));
+ zc->ldmSequences = (rawSeq*)ZSTD_cwksp_reserve_aligned(ws, maxNbLdmSeq * sizeof(rawSeq));
+ zc->maxNbLdmSequences = maxNbLdmSeq;
+
+ ZSTD_window_init(&zc->ldmState.window);
+ ZSTD_window_clear(&zc->ldmState.window);
+ zc->ldmState.loadedDictEnd = 0;
+ }
+
+ /* Due to alignment, when reusing a workspace, we can actually consume
+ * up to 3 extra bytes for alignment. See the comments in zstd_cwksp.h
+ */
+ assert(ZSTD_cwksp_used(ws) >= neededSpace &&
+ ZSTD_cwksp_used(ws) <= neededSpace + 3);
+
+ DEBUGLOG(3, "wksp: finished allocating, %zd bytes remain available", ZSTD_cwksp_available_space(ws));
+ zc->initialized = 1;
+
+ return 0;
+ }
+}
+
+/* ZSTD_invalidateRepCodes() :
+ * ensures next compression will not use repcodes from previous block.
+ * Note : only works with regular variant;
+ * do not use with extDict variant ! */
+void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx) {
+ int i;
+ for (i=0; i<ZSTD_REP_NUM; i++) cctx->blockState.prevCBlock->rep[i] = 0;
+ assert(!ZSTD_window_hasExtDict(cctx->blockState.matchState.window));
+}
+
+/* These are the approximate sizes for each strategy past which copying the
+ * dictionary tables into the working context is faster than using them
+ * in-place.
+ */
+static const size_t attachDictSizeCutoffs[ZSTD_STRATEGY_MAX+1] = {
+ 8 KB, /* unused */
+ 8 KB, /* ZSTD_fast */
+ 16 KB, /* ZSTD_dfast */
+ 32 KB, /* ZSTD_greedy */
+ 32 KB, /* ZSTD_lazy */
+ 32 KB, /* ZSTD_lazy2 */
+ 32 KB, /* ZSTD_btlazy2 */
+ 32 KB, /* ZSTD_btopt */
+ 8 KB, /* ZSTD_btultra */
+ 8 KB /* ZSTD_btultra2 */
+};
+
+static int ZSTD_shouldAttachDict(const ZSTD_CDict* cdict,
+ const ZSTD_CCtx_params* params,
+ U64 pledgedSrcSize)
+{
+ size_t cutoff = attachDictSizeCutoffs[cdict->matchState.cParams.strategy];
+ int const dedicatedDictSearch = cdict->matchState.dedicatedDictSearch;
+ return dedicatedDictSearch
+ || ( ( pledgedSrcSize <= cutoff
+ || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
+ || params->attachDictPref == ZSTD_dictForceAttach )
+ && params->attachDictPref != ZSTD_dictForceCopy
+ && !params->forceWindow ); /* dictMatchState isn't correctly
+ * handled in _enforceMaxDist */
+}
+
+static size_t
+ZSTD_resetCCtx_byAttachingCDict(ZSTD_CCtx* cctx,
+ const ZSTD_CDict* cdict,
+ ZSTD_CCtx_params params,
+ U64 pledgedSrcSize,
+ ZSTD_buffered_policy_e zbuff)
+{
+ {
+ ZSTD_compressionParameters adjusted_cdict_cParams = cdict->matchState.cParams;
+ unsigned const windowLog = params.cParams.windowLog;
+ assert(windowLog != 0);
+ /* Resize working context table params for input only, since the dict
+ * has its own tables. */
+ /* pledgedSrcSize == 0 means 0! */
+
+ if (cdict->matchState.dedicatedDictSearch) {
+ ZSTD_dedicatedDictSearch_revertCParams(&adjusted_cdict_cParams);
+ }
+
+ params.cParams = ZSTD_adjustCParams_internal(adjusted_cdict_cParams, pledgedSrcSize,
+ cdict->dictContentSize, ZSTD_cpm_attachDict);
+ params.cParams.windowLog = windowLog;
+ FORWARD_IF_ERROR(ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
+ ZSTDcrp_makeClean, zbuff), "");
+ assert(cctx->appliedParams.cParams.strategy == adjusted_cdict_cParams.strategy);
+ }
+
+ { const U32 cdictEnd = (U32)( cdict->matchState.window.nextSrc
+ - cdict->matchState.window.base);
+ const U32 cdictLen = cdictEnd - cdict->matchState.window.dictLimit;
+ if (cdictLen == 0) {
+ /* don't even attach dictionaries with no contents */
+ DEBUGLOG(4, "skipping attaching empty dictionary");
+ } else {
+ DEBUGLOG(4, "attaching dictionary into context");
+ cctx->blockState.matchState.dictMatchState = &cdict->matchState;
+
+ /* prep working match state so dict matches never have negative indices
+ * when they are translated to the working context's index space. */
+ if (cctx->blockState.matchState.window.dictLimit < cdictEnd) {
+ cctx->blockState.matchState.window.nextSrc =
+ cctx->blockState.matchState.window.base + cdictEnd;
+ ZSTD_window_clear(&cctx->blockState.matchState.window);
+ }
+ /* loadedDictEnd is expressed within the referential of the active context */
+ cctx->blockState.matchState.loadedDictEnd = cctx->blockState.matchState.window.dictLimit;
+ } }
+
+ cctx->dictID = cdict->dictID;
+ cctx->dictContentSize = cdict->dictContentSize;
+
+ /* copy block state */
+ ZSTD_memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState));
+
+ return 0;
+}
+
+static size_t ZSTD_resetCCtx_byCopyingCDict(ZSTD_CCtx* cctx,
+ const ZSTD_CDict* cdict,
+ ZSTD_CCtx_params params,
+ U64 pledgedSrcSize,
+ ZSTD_buffered_policy_e zbuff)
+{
+ const ZSTD_compressionParameters *cdict_cParams = &cdict->matchState.cParams;
+
+ assert(!cdict->matchState.dedicatedDictSearch);
+
+ DEBUGLOG(4, "copying dictionary into context");
+
+ { unsigned const windowLog = params.cParams.windowLog;
+ assert(windowLog != 0);
+ /* Copy only compression parameters related to tables. */
+ params.cParams = *cdict_cParams;
+ params.cParams.windowLog = windowLog;
+ FORWARD_IF_ERROR(ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
+ ZSTDcrp_leaveDirty, zbuff), "");
+ assert(cctx->appliedParams.cParams.strategy == cdict_cParams->strategy);
+ assert(cctx->appliedParams.cParams.hashLog == cdict_cParams->hashLog);
+ assert(cctx->appliedParams.cParams.chainLog == cdict_cParams->chainLog);
+ }
+
+ ZSTD_cwksp_mark_tables_dirty(&cctx->workspace);
+
+ /* copy tables */
+ { size_t const chainSize = (cdict_cParams->strategy == ZSTD_fast) ? 0 : ((size_t)1 << cdict_cParams->chainLog);
+ size_t const hSize = (size_t)1 << cdict_cParams->hashLog;
+
+ ZSTD_memcpy(cctx->blockState.matchState.hashTable,
+ cdict->matchState.hashTable,
+ hSize * sizeof(U32));
+ ZSTD_memcpy(cctx->blockState.matchState.chainTable,
+ cdict->matchState.chainTable,
+ chainSize * sizeof(U32));
+ }
+
+ /* Zero the hashTable3, since the cdict never fills it */
+ { int const h3log = cctx->blockState.matchState.hashLog3;
+ size_t const h3Size = h3log ? ((size_t)1 << h3log) : 0;
+ assert(cdict->matchState.hashLog3 == 0);
+ ZSTD_memset(cctx->blockState.matchState.hashTable3, 0, h3Size * sizeof(U32));
+ }
+
+ ZSTD_cwksp_mark_tables_clean(&cctx->workspace);
+
+ /* copy dictionary offsets */
+ { ZSTD_matchState_t const* srcMatchState = &cdict->matchState;
+ ZSTD_matchState_t* dstMatchState = &cctx->blockState.matchState;
+ dstMatchState->window = srcMatchState->window;
+ dstMatchState->nextToUpdate = srcMatchState->nextToUpdate;
+ dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd;
+ }
+
+ cctx->dictID = cdict->dictID;
+ cctx->dictContentSize = cdict->dictContentSize;
+
+ /* copy block state */
+ ZSTD_memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState));
+
+ return 0;
+}
+
+/* We have a choice between copying the dictionary context into the working
+ * context, or referencing the dictionary context from the working context
+ * in-place. We decide here which strategy to use. */
+static size_t ZSTD_resetCCtx_usingCDict(ZSTD_CCtx* cctx,
+ const ZSTD_CDict* cdict,
+ const ZSTD_CCtx_params* params,
+ U64 pledgedSrcSize,
+ ZSTD_buffered_policy_e zbuff)
+{
+
+ DEBUGLOG(4, "ZSTD_resetCCtx_usingCDict (pledgedSrcSize=%u)",
+ (unsigned)pledgedSrcSize);
+
+ if (ZSTD_shouldAttachDict(cdict, params, pledgedSrcSize)) {
+ return ZSTD_resetCCtx_byAttachingCDict(
+ cctx, cdict, *params, pledgedSrcSize, zbuff);
+ } else {
+ return ZSTD_resetCCtx_byCopyingCDict(
+ cctx, cdict, *params, pledgedSrcSize, zbuff);
+ }
+}
+
+/*! ZSTD_copyCCtx_internal() :
+ * Duplicate an existing context `srcCCtx` into another one `dstCCtx`.
+ * Only works during stage ZSTDcs_init (i.e. after creation, but before first call to ZSTD_compressContinue()).
+ * The "context", in this case, refers to the hash and chain tables,
+ * entropy tables, and dictionary references.
+ * `windowLog` value is enforced if != 0, otherwise value is copied from srcCCtx.
+ * @return : 0, or an error code */
+static size_t ZSTD_copyCCtx_internal(ZSTD_CCtx* dstCCtx,
+ const ZSTD_CCtx* srcCCtx,
+ ZSTD_frameParameters fParams,
+ U64 pledgedSrcSize,
+ ZSTD_buffered_policy_e zbuff)
+{
+ DEBUGLOG(5, "ZSTD_copyCCtx_internal");
+ RETURN_ERROR_IF(srcCCtx->stage!=ZSTDcs_init, stage_wrong,
+ "Can't copy a ctx that's not in init stage.");
+
+ ZSTD_memcpy(&dstCCtx->customMem, &srcCCtx->customMem, sizeof(ZSTD_customMem));
+ { ZSTD_CCtx_params params = dstCCtx->requestedParams;
+ /* Copy only compression parameters related to tables. */
+ params.cParams = srcCCtx->appliedParams.cParams;
+ params.fParams = fParams;
+ ZSTD_resetCCtx_internal(dstCCtx, params, pledgedSrcSize,
+ ZSTDcrp_leaveDirty, zbuff);
+ assert(dstCCtx->appliedParams.cParams.windowLog == srcCCtx->appliedParams.cParams.windowLog);
+ assert(dstCCtx->appliedParams.cParams.strategy == srcCCtx->appliedParams.cParams.strategy);
+ assert(dstCCtx->appliedParams.cParams.hashLog == srcCCtx->appliedParams.cParams.hashLog);
+ assert(dstCCtx->appliedParams.cParams.chainLog == srcCCtx->appliedParams.cParams.chainLog);
+ assert(dstCCtx->blockState.matchState.hashLog3 == srcCCtx->blockState.matchState.hashLog3);
+ }
+
+ ZSTD_cwksp_mark_tables_dirty(&dstCCtx->workspace);
+
+ /* copy tables */
+ { size_t const chainSize = (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;
+ int const h3log = srcCCtx->blockState.matchState.hashLog3;
+ size_t const h3Size = h3log ? ((size_t)1 << h3log) : 0;
+
+ ZSTD_memcpy(dstCCtx->blockState.matchState.hashTable,
+ srcCCtx->blockState.matchState.hashTable,
+ hSize * sizeof(U32));
+ ZSTD_memcpy(dstCCtx->blockState.matchState.chainTable,
+ srcCCtx->blockState.matchState.chainTable,
+ chainSize * sizeof(U32));
+ ZSTD_memcpy(dstCCtx->blockState.matchState.hashTable3,
+ srcCCtx->blockState.matchState.hashTable3,
+ h3Size * sizeof(U32));
+ }
+
+ ZSTD_cwksp_mark_tables_clean(&dstCCtx->workspace);
+
+ /* copy dictionary offsets */
+ {
+ const ZSTD_matchState_t* srcMatchState = &srcCCtx->blockState.matchState;
+ ZSTD_matchState_t* dstMatchState = &dstCCtx->blockState.matchState;
+ dstMatchState->window = srcMatchState->window;
+ dstMatchState->nextToUpdate = srcMatchState->nextToUpdate;
+ dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd;
+ }
+ dstCCtx->dictID = srcCCtx->dictID;
+ dstCCtx->dictContentSize = srcCCtx->dictContentSize;
+
+ /* copy block state */
+ ZSTD_memcpy(dstCCtx->blockState.prevCBlock, srcCCtx->blockState.prevCBlock, sizeof(*srcCCtx->blockState.prevCBlock));
+
+ return 0;
+}
+
+/*! ZSTD_copyCCtx() :
+ * Duplicate an existing context `srcCCtx` into another one `dstCCtx`.
+ * Only works during stage ZSTDcs_init (i.e. after creation, but before first call to ZSTD_compressContinue()).
+ * pledgedSrcSize==0 means "unknown".
+* @return : 0, or an error code */
+size_t ZSTD_copyCCtx(ZSTD_CCtx* dstCCtx, const ZSTD_CCtx* srcCCtx, unsigned long long pledgedSrcSize)
+{
+ ZSTD_frameParameters fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
+ ZSTD_buffered_policy_e const zbuff = srcCCtx->bufferedPolicy;
+ ZSTD_STATIC_ASSERT((U32)ZSTDb_buffered==1);
+ if (pledgedSrcSize==0) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN;
+ fParams.contentSizeFlag = (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN);
+
+ return ZSTD_copyCCtx_internal(dstCCtx, srcCCtx,
+ fParams, pledgedSrcSize,
+ zbuff);
+}
+
+
+#define ZSTD_ROWSIZE 16
+/*! ZSTD_reduceTable() :
+ * reduce table indexes by `reducerValue`, or squash to zero.
+ * PreserveMark preserves "unsorted mark" for btlazy2 strategy.
+ * It must be set to a clear 0/1 value, to remove branch during inlining.
+ * Presume table size is a multiple of ZSTD_ROWSIZE
+ * to help auto-vectorization */
+FORCE_INLINE_TEMPLATE void
+ZSTD_reduceTable_internal (U32* const table, U32 const size, U32 const reducerValue, int const preserveMark)
+{
+ int const nbRows = (int)size / ZSTD_ROWSIZE;
+ int cellNb = 0;
+ int rowNb;
+ assert((size & (ZSTD_ROWSIZE-1)) == 0); /* multiple of ZSTD_ROWSIZE */
+ assert(size < (1U<<31)); /* can be casted to int */
+
+
+ for (rowNb=0 ; rowNb < nbRows ; rowNb++) {
+ int column;
+ for (column=0; column<ZSTD_ROWSIZE; column++) {
+ if (preserveMark) {
+ U32 const adder = (table[cellNb] == ZSTD_DUBT_UNSORTED_MARK) ? reducerValue : 0;
+ table[cellNb] += adder;
+ }
+ if (table[cellNb] < reducerValue) table[cellNb] = 0;
+ else table[cellNb] -= reducerValue;
+ cellNb++;
+ } }
+}
+
+static void ZSTD_reduceTable(U32* const table, U32 const size, U32 const reducerValue)
+{
+ ZSTD_reduceTable_internal(table, size, reducerValue, 0);
+}
+
+static void ZSTD_reduceTable_btlazy2(U32* const table, U32 const size, U32 const reducerValue)
+{
+ ZSTD_reduceTable_internal(table, size, reducerValue, 1);
+}
+
+/*! ZSTD_reduceIndex() :
+* rescale all indexes to avoid future overflow (indexes are U32) */
+static void ZSTD_reduceIndex (ZSTD_matchState_t* ms, ZSTD_CCtx_params const* params, const U32 reducerValue)
+{
+ { U32 const hSize = (U32)1 << params->cParams.hashLog;
+ ZSTD_reduceTable(ms->hashTable, hSize, reducerValue);
+ }
+
+ if (params->cParams.strategy != ZSTD_fast) {
+ U32 const chainSize = (U32)1 << params->cParams.chainLog;
+ if (params->cParams.strategy == ZSTD_btlazy2)
+ ZSTD_reduceTable_btlazy2(ms->chainTable, chainSize, reducerValue);
+ else
+ ZSTD_reduceTable(ms->chainTable, chainSize, reducerValue);
+ }
+
+ if (ms->hashLog3) {
+ U32 const h3Size = (U32)1 << ms->hashLog3;
+ ZSTD_reduceTable(ms->hashTable3, h3Size, reducerValue);
+ }
+}
+
+
+/*-*******************************************************
+* Block entropic compression
+*********************************************************/
+
+/* See doc/zstd_compression_format.md for detailed format description */
+
+void ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
+{
+ const seqDef* const sequences = seqStorePtr->sequencesStart;
+ BYTE* const llCodeTable = seqStorePtr->llCode;
+ BYTE* const ofCodeTable = seqStorePtr->ofCode;
+ BYTE* const mlCodeTable = seqStorePtr->mlCode;
+ U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
+ U32 u;
+ assert(nbSeq <= seqStorePtr->maxNbSeq);
+ for (u=0; u<nbSeq; u++) {
+ U32 const llv = sequences[u].litLength;
+ U32 const mlv = sequences[u].matchLength;
+ llCodeTable[u] = (BYTE)ZSTD_LLcode(llv);
+ ofCodeTable[u] = (BYTE)ZSTD_highbit32(sequences[u].offset);
+ mlCodeTable[u] = (BYTE)ZSTD_MLcode(mlv);
+ }
+ if (seqStorePtr->longLengthID==1)
+ llCodeTable[seqStorePtr->longLengthPos] = MaxLL;
+ if (seqStorePtr->longLengthID==2)
+ mlCodeTable[seqStorePtr->longLengthPos] = MaxML;
+}
+
+/* ZSTD_useTargetCBlockSize():
+ * Returns if target compressed block size param is being used.
+ * If used, compression will do best effort to make a compressed block size to be around targetCBlockSize.
+ * Returns 1 if true, 0 otherwise. */
+static int ZSTD_useTargetCBlockSize(const ZSTD_CCtx_params* cctxParams)
+{
+ DEBUGLOG(5, "ZSTD_useTargetCBlockSize (targetCBlockSize=%zu)", cctxParams->targetCBlockSize);
+ return (cctxParams->targetCBlockSize != 0);
+}
+
+/* ZSTD_entropyCompressSequences_internal():
+ * actually compresses both literals and sequences */
+MEM_STATIC size_t
+ZSTD_entropyCompressSequences_internal(seqStore_t* seqStorePtr,
+ const ZSTD_entropyCTables_t* prevEntropy,
+ ZSTD_entropyCTables_t* nextEntropy,
+ const ZSTD_CCtx_params* cctxParams,
+ void* dst, size_t dstCapacity,
+ void* entropyWorkspace, size_t entropyWkspSize,
+ const int bmi2)
+{
+ const int longOffsets = cctxParams->cParams.windowLog > STREAM_ACCUMULATOR_MIN;
+ ZSTD_strategy const strategy = cctxParams->cParams.strategy;
+ unsigned* count = (unsigned*)entropyWorkspace;
+ FSE_CTable* CTable_LitLength = nextEntropy->fse.litlengthCTable;
+ FSE_CTable* CTable_OffsetBits = nextEntropy->fse.offcodeCTable;
+ FSE_CTable* CTable_MatchLength = nextEntropy->fse.matchlengthCTable;
+ 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 = (size_t)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
+ BYTE* seqHead;
+ BYTE* lastNCount = NULL;
+
+ entropyWorkspace = count + (MaxSeq + 1);
+ entropyWkspSize -= (MaxSeq + 1) * sizeof(*count);
+
+ DEBUGLOG(4, "ZSTD_entropyCompressSequences_internal (nbSeq=%zu)", nbSeq);
+ ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<<MAX(MLFSELog,LLFSELog)));
+ assert(entropyWkspSize >= HUF_WORKSPACE_SIZE);
+
+ /* Compress literals */
+ { const BYTE* const literals = seqStorePtr->litStart;
+ size_t const litSize = (size_t)(seqStorePtr->lit - literals);
+ size_t const cSize = ZSTD_compressLiterals(
+ &prevEntropy->huf, &nextEntropy->huf,
+ cctxParams->cParams.strategy,
+ ZSTD_disableLiteralsCompression(cctxParams),
+ op, dstCapacity,
+ literals, litSize,
+ entropyWorkspace, entropyWkspSize,
+ bmi2);
+ FORWARD_IF_ERROR(cSize, "ZSTD_compressLiterals failed");
+ assert(cSize <= dstCapacity);
+ op += cSize;
+ }
+
+ /* Sequences Header */
+ RETURN_ERROR_IF((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead*/,
+ dstSize_tooSmall, "Can't fit seq hdr in output buf!");
+ if (nbSeq < 128) {
+ *op++ = (BYTE)nbSeq;
+ } else if (nbSeq < LONGNBSEQ) {
+ op[0] = (BYTE)((nbSeq>>8) + 0x80);
+ op[1] = (BYTE)nbSeq;
+ op+=2;
+ } else {
+ op[0]=0xFF;
+ MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ));
+ op+=3;
+ }
+ assert(op <= oend);
+ if (nbSeq==0) {
+ /* Copy the old tables over as if we repeated them */
+ ZSTD_memcpy(&nextEntropy->fse, &prevEntropy->fse, sizeof(prevEntropy->fse));
+ return (size_t)(op - ostart);
+ }
+
+ /* seqHead : flags for FSE encoding type */
+ seqHead = op++;
+ assert(op <= oend);
+
+ /* convert length/distances into codes */
+ ZSTD_seqToCodes(seqStorePtr);
+ /* build CTable for Literal Lengths */
+ { unsigned max = MaxLL;
+ size_t const mostFrequent = HIST_countFast_wksp(count, &max, llCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */
+ DEBUGLOG(5, "Building LL table");
+ nextEntropy->fse.litlength_repeatMode = prevEntropy->fse.litlength_repeatMode;
+ LLtype = ZSTD_selectEncodingType(&nextEntropy->fse.litlength_repeatMode,
+ count, max, mostFrequent, nbSeq,
+ LLFSELog, prevEntropy->fse.litlengthCTable,
+ LL_defaultNorm, LL_defaultNormLog,
+ ZSTD_defaultAllowed, strategy);
+ assert(set_basic < set_compressed && set_rle < set_compressed);
+ assert(!(LLtype < set_compressed && nextEntropy->fse.litlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */
+ { size_t const countSize = ZSTD_buildCTable(
+ op, (size_t)(oend - op),
+ CTable_LitLength, LLFSELog, (symbolEncodingType_e)LLtype,
+ count, max, llCodeTable, nbSeq,
+ LL_defaultNorm, LL_defaultNormLog, MaxLL,
+ prevEntropy->fse.litlengthCTable,
+ sizeof(prevEntropy->fse.litlengthCTable),
+ entropyWorkspace, entropyWkspSize);
+ FORWARD_IF_ERROR(countSize, "ZSTD_buildCTable for LitLens failed");
+ if (LLtype == set_compressed)
+ lastNCount = op;
+ op += countSize;
+ assert(op <= oend);
+ } }
+ /* build CTable for Offsets */
+ { unsigned max = MaxOff;
+ size_t const mostFrequent = HIST_countFast_wksp(
+ count, &max, ofCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */
+ /* We can only use the basic table if max <= DefaultMaxOff, otherwise the offsets are too large */
+ ZSTD_defaultPolicy_e const defaultPolicy = (max <= DefaultMaxOff) ? ZSTD_defaultAllowed : ZSTD_defaultDisallowed;
+ DEBUGLOG(5, "Building OF table");
+ nextEntropy->fse.offcode_repeatMode = prevEntropy->fse.offcode_repeatMode;
+ Offtype = ZSTD_selectEncodingType(&nextEntropy->fse.offcode_repeatMode,
+ count, max, mostFrequent, nbSeq,
+ OffFSELog, prevEntropy->fse.offcodeCTable,
+ OF_defaultNorm, OF_defaultNormLog,
+ defaultPolicy, strategy);
+ assert(!(Offtype < set_compressed && nextEntropy->fse.offcode_repeatMode != FSE_repeat_none)); /* We don't copy tables */
+ { size_t const countSize = ZSTD_buildCTable(
+ op, (size_t)(oend - op),
+ CTable_OffsetBits, OffFSELog, (symbolEncodingType_e)Offtype,
+ count, max, ofCodeTable, nbSeq,
+ OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
+ prevEntropy->fse.offcodeCTable,
+ sizeof(prevEntropy->fse.offcodeCTable),
+ entropyWorkspace, entropyWkspSize);
+ FORWARD_IF_ERROR(countSize, "ZSTD_buildCTable for Offsets failed");
+ if (Offtype == set_compressed)
+ lastNCount = op;
+ op += countSize;
+ assert(op <= oend);
+ } }
+ /* build CTable for MatchLengths */
+ { unsigned max = MaxML;
+ size_t const mostFrequent = HIST_countFast_wksp(
+ count, &max, mlCodeTable, nbSeq, entropyWorkspace, entropyWkspSize); /* can't fail */
+ DEBUGLOG(5, "Building ML table (remaining space : %i)", (int)(oend-op));
+ nextEntropy->fse.matchlength_repeatMode = prevEntropy->fse.matchlength_repeatMode;
+ MLtype = ZSTD_selectEncodingType(&nextEntropy->fse.matchlength_repeatMode,
+ count, max, mostFrequent, nbSeq,
+ MLFSELog, prevEntropy->fse.matchlengthCTable,
+ ML_defaultNorm, ML_defaultNormLog,
+ ZSTD_defaultAllowed, strategy);
+ assert(!(MLtype < set_compressed && nextEntropy->fse.matchlength_repeatMode != FSE_repeat_none)); /* We don't copy tables */
+ { size_t const countSize = ZSTD_buildCTable(
+ op, (size_t)(oend - op),
+ CTable_MatchLength, MLFSELog, (symbolEncodingType_e)MLtype,
+ count, max, mlCodeTable, nbSeq,
+ ML_defaultNorm, ML_defaultNormLog, MaxML,
+ prevEntropy->fse.matchlengthCTable,
+ sizeof(prevEntropy->fse.matchlengthCTable),
+ entropyWorkspace, entropyWkspSize);
+ FORWARD_IF_ERROR(countSize, "ZSTD_buildCTable for MatchLengths failed");
+ if (MLtype == set_compressed)
+ lastNCount = op;
+ op += countSize;
+ assert(op <= oend);
+ } }
+
+ *seqHead = (BYTE)((LLtype<<6) + (Offtype<<4) + (MLtype<<2));
+
+ { size_t const bitstreamSize = ZSTD_encodeSequences(
+ op, (size_t)(oend - op),
+ CTable_MatchLength, mlCodeTable,
+ CTable_OffsetBits, ofCodeTable,
+ CTable_LitLength, llCodeTable,
+ sequences, nbSeq,
+ longOffsets, bmi2);
+ FORWARD_IF_ERROR(bitstreamSize, "ZSTD_encodeSequences failed");
+ op += bitstreamSize;
+ assert(op <= oend);
+ /* zstd versions <= 1.3.4 mistakenly report corruption when
+ * FSE_readNCount() receives a buffer < 4 bytes.
+ * Fixed by https://github.com/facebook/zstd/pull/1146.
+ * This can happen when the last set_compressed table present is 2
+ * bytes and the bitstream is only one byte.
+ * In this exceedingly rare case, we will simply emit an uncompressed
+ * block, since it isn't worth optimizing.
+ */
+ if (lastNCount && (op - lastNCount) < 4) {
+ /* NCountSize >= 2 && bitstreamSize > 0 ==> lastCountSize == 3 */
+ assert(op - lastNCount == 3);
+ DEBUGLOG(5, "Avoiding bug in zstd decoder in versions <= 1.3.4 by "
+ "emitting an uncompressed block.");
+ return 0;
+ }
+ }
+
+ DEBUGLOG(5, "compressed block size : %u", (unsigned)(op - ostart));
+ return (size_t)(op - ostart);
+}
+
+MEM_STATIC size_t
+ZSTD_entropyCompressSequences(seqStore_t* seqStorePtr,
+ const ZSTD_entropyCTables_t* prevEntropy,
+ ZSTD_entropyCTables_t* nextEntropy,
+ const ZSTD_CCtx_params* cctxParams,
+ void* dst, size_t dstCapacity,
+ size_t srcSize,
+ void* entropyWorkspace, size_t entropyWkspSize,
+ int bmi2)
+{
+ size_t const cSize = ZSTD_entropyCompressSequences_internal(
+ seqStorePtr, prevEntropy, nextEntropy, cctxParams,
+ dst, dstCapacity,
+ entropyWorkspace, entropyWkspSize, bmi2);
+ if (cSize == 0) return 0;
+ /* When srcSize <= dstCapacity, there is enough space to write a raw uncompressed block.
+ * Since we ran out of space, block must be not compressible, so fall back to raw uncompressed block.
+ */
+ if ((cSize == ERROR(dstSize_tooSmall)) & (srcSize <= dstCapacity))
+ return 0; /* block not compressed */
+ FORWARD_IF_ERROR(cSize, "ZSTD_entropyCompressSequences_internal failed");
+
+ /* Check compressibility */
+ { size_t const maxCSize = srcSize - ZSTD_minGain(srcSize, cctxParams->cParams.strategy);
+ if (cSize >= maxCSize) return 0; /* block not compressed */
+ }
+ DEBUGLOG(4, "ZSTD_entropyCompressSequences() cSize: %zu\n", cSize);
+ return cSize;
+}
+
+/* ZSTD_selectBlockCompressor() :
+ * Not static, but internal use only (used by long distance matcher)
+ * assumption : strat is a valid strategy */
+ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, ZSTD_dictMode_e dictMode)
+{
+ static const ZSTD_blockCompressor blockCompressor[4][ZSTD_STRATEGY_MAX+1] = {
+ { ZSTD_compressBlock_fast /* default for 0 */,
+ ZSTD_compressBlock_fast,
+ ZSTD_compressBlock_doubleFast,
+ ZSTD_compressBlock_greedy,
+ ZSTD_compressBlock_lazy,
+ ZSTD_compressBlock_lazy2,
+ ZSTD_compressBlock_btlazy2,
+ ZSTD_compressBlock_btopt,
+ ZSTD_compressBlock_btultra,
+ ZSTD_compressBlock_btultra2 },
+ { ZSTD_compressBlock_fast_extDict /* default for 0 */,
+ ZSTD_compressBlock_fast_extDict,
+ ZSTD_compressBlock_doubleFast_extDict,
+ ZSTD_compressBlock_greedy_extDict,
+ ZSTD_compressBlock_lazy_extDict,
+ ZSTD_compressBlock_lazy2_extDict,
+ ZSTD_compressBlock_btlazy2_extDict,
+ ZSTD_compressBlock_btopt_extDict,
+ ZSTD_compressBlock_btultra_extDict,
+ ZSTD_compressBlock_btultra_extDict },
+ { ZSTD_compressBlock_fast_dictMatchState /* default for 0 */,
+ ZSTD_compressBlock_fast_dictMatchState,
+ ZSTD_compressBlock_doubleFast_dictMatchState,
+ ZSTD_compressBlock_greedy_dictMatchState,
+ ZSTD_compressBlock_lazy_dictMatchState,
+ ZSTD_compressBlock_lazy2_dictMatchState,
+ ZSTD_compressBlock_btlazy2_dictMatchState,
+ ZSTD_compressBlock_btopt_dictMatchState,
+ ZSTD_compressBlock_btultra_dictMatchState,
+ ZSTD_compressBlock_btultra_dictMatchState },
+ { NULL /* default for 0 */,
+ NULL,
+ NULL,
+ ZSTD_compressBlock_greedy_dedicatedDictSearch,
+ ZSTD_compressBlock_lazy_dedicatedDictSearch,
+ ZSTD_compressBlock_lazy2_dedicatedDictSearch,
+ NULL,
+ NULL,
+ NULL,
+ NULL }
+ };
+ ZSTD_blockCompressor selectedCompressor;
+ ZSTD_STATIC_ASSERT((unsigned)ZSTD_fast == 1);
+
+ assert(ZSTD_cParam_withinBounds(ZSTD_c_strategy, strat));
+ selectedCompressor = blockCompressor[(int)dictMode][(int)strat];
+ assert(selectedCompressor != NULL);
+ return selectedCompressor;
+}
+
+static void ZSTD_storeLastLiterals(seqStore_t* seqStorePtr,
+ const BYTE* anchor, size_t lastLLSize)
+{
+ ZSTD_memcpy(seqStorePtr->lit, anchor, lastLLSize);
+ seqStorePtr->lit += lastLLSize;
+}
+
+void ZSTD_resetSeqStore(seqStore_t* ssPtr)
+{
+ ssPtr->lit = ssPtr->litStart;
+ ssPtr->sequences = ssPtr->sequencesStart;
+ ssPtr->longLengthID = 0;
+}
+
+typedef enum { ZSTDbss_compress, ZSTDbss_noCompress } ZSTD_buildSeqStore_e;
+
+static size_t ZSTD_buildSeqStore(ZSTD_CCtx* zc, const void* src, size_t srcSize)
+{
+ ZSTD_matchState_t* const ms = &zc->blockState.matchState;
+ DEBUGLOG(5, "ZSTD_buildSeqStore (srcSize=%zu)", srcSize);
+ assert(srcSize <= ZSTD_BLOCKSIZE_MAX);
+ /* Assert that we have correctly flushed the ctx params into the ms's copy */
+ ZSTD_assertEqualCParams(zc->appliedParams.cParams, ms->cParams);
+ if (srcSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) {
+ if (zc->appliedParams.cParams.strategy >= ZSTD_btopt) {
+ ZSTD_ldm_skipRawSeqStoreBytes(&zc->externSeqStore, srcSize);
+ } else {
+ ZSTD_ldm_skipSequences(&zc->externSeqStore, srcSize, zc->appliedParams.cParams.minMatch);
+ }
+ return ZSTDbss_noCompress; /* don't even attempt compression below a certain srcSize */
+ }
+ ZSTD_resetSeqStore(&(zc->seqStore));
+ /* required for optimal parser to read stats from dictionary */
+ ms->opt.symbolCosts = &zc->blockState.prevCBlock->entropy;
+ /* tell the optimal parser how we expect to compress literals */
+ ms->opt.literalCompressionMode = zc->appliedParams.literalCompressionMode;
+ /* a gap between an attached dict and the current window is not safe,
+ * they must remain adjacent,
+ * and when that stops being the case, the dict must be unset */
+ assert(ms->dictMatchState == NULL || ms->loadedDictEnd == ms->window.dictLimit);
+
+ /* limited update after a very long match */
+ { const BYTE* const base = ms->window.base;
+ const BYTE* const istart = (const BYTE*)src;
+ const U32 curr = (U32)(istart-base);
+ if (sizeof(ptrdiff_t)==8) assert(istart - base < (ptrdiff_t)(U32)(-1)); /* ensure no overflow */
+ if (curr > ms->nextToUpdate + 384)
+ ms->nextToUpdate = curr - MIN(192, (U32)(curr - ms->nextToUpdate - 384));
+ }
+
+ /* select and store sequences */
+ { ZSTD_dictMode_e const dictMode = ZSTD_matchState_dictMode(ms);
+ size_t lastLLSize;
+ { int i;
+ for (i = 0; i < ZSTD_REP_NUM; ++i)
+ zc->blockState.nextCBlock->rep[i] = zc->blockState.prevCBlock->rep[i];
+ }
+ if (zc->externSeqStore.pos < zc->externSeqStore.size) {
+ assert(!zc->appliedParams.ldmParams.enableLdm);
+ /* Updates ldmSeqStore.pos */
+ lastLLSize =
+ ZSTD_ldm_blockCompress(&zc->externSeqStore,
+ ms, &zc->seqStore,
+ zc->blockState.nextCBlock->rep,
+ src, srcSize);
+ assert(zc->externSeqStore.pos <= zc->externSeqStore.size);
+ } else if (zc->appliedParams.ldmParams.enableLdm) {
+ rawSeqStore_t ldmSeqStore = kNullRawSeqStore;
+
+ ldmSeqStore.seq = zc->ldmSequences;
+ ldmSeqStore.capacity = zc->maxNbLdmSequences;
+ /* Updates ldmSeqStore.size */
+ FORWARD_IF_ERROR(ZSTD_ldm_generateSequences(&zc->ldmState, &ldmSeqStore,
+ &zc->appliedParams.ldmParams,
+ src, srcSize), "");
+ /* Updates ldmSeqStore.pos */
+ lastLLSize =
+ ZSTD_ldm_blockCompress(&ldmSeqStore,
+ ms, &zc->seqStore,
+ zc->blockState.nextCBlock->rep,
+ src, srcSize);
+ assert(ldmSeqStore.pos == ldmSeqStore.size);
+ } else { /* not long range mode */
+ ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(zc->appliedParams.cParams.strategy, dictMode);
+ ms->ldmSeqStore = NULL;
+ lastLLSize = blockCompressor(ms, &zc->seqStore, zc->blockState.nextCBlock->rep, src, srcSize);
+ }
+ { const BYTE* const lastLiterals = (const BYTE*)src + srcSize - lastLLSize;
+ ZSTD_storeLastLiterals(&zc->seqStore, lastLiterals, lastLLSize);
+ } }
+ return ZSTDbss_compress;
+}
+
+static void ZSTD_copyBlockSequences(ZSTD_CCtx* zc)
+{
+ const seqStore_t* seqStore = ZSTD_getSeqStore(zc);
+ const seqDef* seqStoreSeqs = seqStore->sequencesStart;
+ size_t seqStoreSeqSize = seqStore->sequences - seqStoreSeqs;
+ size_t seqStoreLiteralsSize = (size_t)(seqStore->lit - seqStore->litStart);
+ size_t literalsRead = 0;
+ size_t lastLLSize;
+
+ ZSTD_Sequence* outSeqs = &zc->seqCollector.seqStart[zc->seqCollector.seqIndex];
+ size_t i;
+ repcodes_t updatedRepcodes;
+
+ assert(zc->seqCollector.seqIndex + 1 < zc->seqCollector.maxSequences);
+ /* Ensure we have enough space for last literals "sequence" */
+ assert(zc->seqCollector.maxSequences >= seqStoreSeqSize + 1);
+ ZSTD_memcpy(updatedRepcodes.rep, zc->blockState.prevCBlock->rep, sizeof(repcodes_t));
+ for (i = 0; i < seqStoreSeqSize; ++i) {
+ U32 rawOffset = seqStoreSeqs[i].offset - ZSTD_REP_NUM;
+ outSeqs[i].litLength = seqStoreSeqs[i].litLength;
+ outSeqs[i].matchLength = seqStoreSeqs[i].matchLength + MINMATCH;
+ outSeqs[i].rep = 0;
+
+ if (i == seqStore->longLengthPos) {
+ if (seqStore->longLengthID == 1) {
+ outSeqs[i].litLength += 0x10000;
+ } else if (seqStore->longLengthID == 2) {
+ outSeqs[i].matchLength += 0x10000;
+ }
+ }
+
+ if (seqStoreSeqs[i].offset <= ZSTD_REP_NUM) {
+ /* Derive the correct offset corresponding to a repcode */
+ outSeqs[i].rep = seqStoreSeqs[i].offset;
+ if (outSeqs[i].litLength != 0) {
+ rawOffset = updatedRepcodes.rep[outSeqs[i].rep - 1];
+ } else {
+ if (outSeqs[i].rep == 3) {
+ rawOffset = updatedRepcodes.rep[0] - 1;
+ } else {
+ rawOffset = updatedRepcodes.rep[outSeqs[i].rep];
+ }
+ }
+ }
+ outSeqs[i].offset = rawOffset;
+ /* seqStoreSeqs[i].offset == offCode+1, and ZSTD_updateRep() expects offCode
+ so we provide seqStoreSeqs[i].offset - 1 */
+ updatedRepcodes = ZSTD_updateRep(updatedRepcodes.rep,
+ seqStoreSeqs[i].offset - 1,
+ seqStoreSeqs[i].litLength == 0);
+ literalsRead += outSeqs[i].litLength;
+ }
+ /* Insert last literals (if any exist) in the block as a sequence with ml == off == 0.
+ * If there are no last literals, then we'll emit (of: 0, ml: 0, ll: 0), which is a marker
+ * for the block boundary, according to the API.
+ */
+ assert(seqStoreLiteralsSize >= literalsRead);
+ lastLLSize = seqStoreLiteralsSize - literalsRead;
+ outSeqs[i].litLength = (U32)lastLLSize;
+ outSeqs[i].matchLength = outSeqs[i].offset = outSeqs[i].rep = 0;
+ seqStoreSeqSize++;
+ zc->seqCollector.seqIndex += seqStoreSeqSize;
+}
+
+size_t ZSTD_generateSequences(ZSTD_CCtx* zc, ZSTD_Sequence* outSeqs,
+ size_t outSeqsSize, const void* src, size_t srcSize)
+{
+ const size_t dstCapacity = ZSTD_compressBound(srcSize);
+ void* dst = ZSTD_customMalloc(dstCapacity, ZSTD_defaultCMem);
+ SeqCollector seqCollector;
+
+ RETURN_ERROR_IF(dst == NULL, memory_allocation, "NULL pointer!");
+
+ seqCollector.collectSequences = 1;
+ seqCollector.seqStart = outSeqs;
+ seqCollector.seqIndex = 0;
+ seqCollector.maxSequences = outSeqsSize;
+ zc->seqCollector = seqCollector;
+
+ ZSTD_compress2(zc, dst, dstCapacity, src, srcSize);
+ ZSTD_customFree(dst, ZSTD_defaultCMem);
+ return zc->seqCollector.seqIndex;
+}
+
+size_t ZSTD_mergeBlockDelimiters(ZSTD_Sequence* sequences, size_t seqsSize) {
+ size_t in = 0;
+ size_t out = 0;
+ for (; in < seqsSize; ++in) {
+ if (sequences[in].offset == 0 && sequences[in].matchLength == 0) {
+ if (in != seqsSize - 1) {
+ sequences[in+1].litLength += sequences[in].litLength;
+ }
+ } else {
+ sequences[out] = sequences[in];
+ ++out;
+ }
+ }
+ return out;
+}
+
+/* Unrolled loop to read four size_ts of input at a time. Returns 1 if is RLE, 0 if not. */
+static int ZSTD_isRLE(const BYTE* src, size_t length) {
+ const BYTE* ip = src;
+ const BYTE value = ip[0];
+ const size_t valueST = (size_t)((U64)value * 0x0101010101010101ULL);
+ const size_t unrollSize = sizeof(size_t) * 4;
+ const size_t unrollMask = unrollSize - 1;
+ const size_t prefixLength = length & unrollMask;
+ size_t i;
+ size_t u;
+ if (length == 1) return 1;
+ /* Check if prefix is RLE first before using unrolled loop */
+ if (prefixLength && ZSTD_count(ip+1, ip, ip+prefixLength) != prefixLength-1) {
+ return 0;
+ }
+ for (i = prefixLength; i != length; i += unrollSize) {
+ for (u = 0; u < unrollSize; u += sizeof(size_t)) {
+ if (MEM_readST(ip + i + u) != valueST) {
+ return 0;
+ }
+ }
+ }
+ return 1;
+}
+
+/* Returns true if the given block may be RLE.
+ * This is just a heuristic based on the compressibility.
+ * It may return both false positives and false negatives.
+ */
+static int ZSTD_maybeRLE(seqStore_t const* seqStore)
+{
+ size_t const nbSeqs = (size_t)(seqStore->sequences - seqStore->sequencesStart);
+ size_t const nbLits = (size_t)(seqStore->lit - seqStore->litStart);
+
+ return nbSeqs < 4 && nbLits < 10;
+}
+
+static void ZSTD_confirmRepcodesAndEntropyTables(ZSTD_CCtx* zc)
+{
+ ZSTD_compressedBlockState_t* const tmp = zc->blockState.prevCBlock;
+ zc->blockState.prevCBlock = zc->blockState.nextCBlock;
+ zc->blockState.nextCBlock = tmp;
+}
+
+static size_t ZSTD_compressBlock_internal(ZSTD_CCtx* zc,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize, U32 frame)
+{
+ /* This the upper bound for the length of an rle block.
+ * This isn't the actual upper bound. Finding the real threshold
+ * needs further investigation.
+ */
+ const U32 rleMaxLength = 25;
+ size_t cSize;
+ const BYTE* ip = (const BYTE*)src;
+ BYTE* op = (BYTE*)dst;
+ DEBUGLOG(5, "ZSTD_compressBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)",
+ (unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit,
+ (unsigned)zc->blockState.matchState.nextToUpdate);
+
+ { const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize);
+ FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed");
+ if (bss == ZSTDbss_noCompress) { cSize = 0; goto out; }
+ }
+
+ if (zc->seqCollector.collectSequences) {
+ ZSTD_copyBlockSequences(zc);
+ ZSTD_confirmRepcodesAndEntropyTables(zc);
+ return 0;
+ }
+
+ /* encode sequences and literals */
+ cSize = ZSTD_entropyCompressSequences(&zc->seqStore,
+ &zc->blockState.prevCBlock->entropy, &zc->blockState.nextCBlock->entropy,
+ &zc->appliedParams,
+ dst, dstCapacity,
+ srcSize,
+ zc->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */,
+ zc->bmi2);
+
+ if (zc->seqCollector.collectSequences) {
+ ZSTD_copyBlockSequences(zc);
+ return 0;
+ }
+
+
+ if (frame &&
+ /* We don't want to emit our first block as a RLE even if it qualifies because
+ * doing so will cause the decoder (cli only) to throw a "should consume all input error."
+ * This is only an issue for zstd <= v1.4.3
+ */
+ !zc->isFirstBlock &&
+ cSize < rleMaxLength &&
+ ZSTD_isRLE(ip, srcSize))
+ {
+ cSize = 1;
+ op[0] = ip[0];
+ }
+
+out:
+ if (!ZSTD_isError(cSize) && cSize > 1) {
+ ZSTD_confirmRepcodesAndEntropyTables(zc);
+ }
+ /* We check that dictionaries have offset codes available for the first
+ * block. After the first block, the offcode table might not have large
+ * enough codes to represent the offsets in the data.
+ */
+ if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
+ zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
+
+ return cSize;
+}
+
+static size_t ZSTD_compressBlock_targetCBlockSize_body(ZSTD_CCtx* zc,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ const size_t bss, U32 lastBlock)
+{
+ DEBUGLOG(6, "Attempting ZSTD_compressSuperBlock()");
+ if (bss == ZSTDbss_compress) {
+ if (/* We don't want to emit our first block as a RLE even if it qualifies because
+ * doing so will cause the decoder (cli only) to throw a "should consume all input error."
+ * This is only an issue for zstd <= v1.4.3
+ */
+ !zc->isFirstBlock &&
+ ZSTD_maybeRLE(&zc->seqStore) &&
+ ZSTD_isRLE((BYTE const*)src, srcSize))
+ {
+ return ZSTD_rleCompressBlock(dst, dstCapacity, *(BYTE const*)src, srcSize, lastBlock);
+ }
+ /* Attempt superblock compression.
+ *
+ * Note that compressed size of ZSTD_compressSuperBlock() is not bound by the
+ * standard ZSTD_compressBound(). This is a problem, because even if we have
+ * space now, taking an extra byte now could cause us to run out of space later
+ * and violate ZSTD_compressBound().
+ *
+ * Define blockBound(blockSize) = blockSize + ZSTD_blockHeaderSize.
+ *
+ * In order to respect ZSTD_compressBound() we must attempt to emit a raw
+ * uncompressed block in these cases:
+ * * cSize == 0: Return code for an uncompressed block.
+ * * cSize == dstSize_tooSmall: We may have expanded beyond blockBound(srcSize).
+ * ZSTD_noCompressBlock() will return dstSize_tooSmall if we are really out of
+ * output space.
+ * * cSize >= blockBound(srcSize): We have expanded the block too much so
+ * emit an uncompressed block.
+ */
+ {
+ size_t const cSize = ZSTD_compressSuperBlock(zc, dst, dstCapacity, src, srcSize, lastBlock);
+ if (cSize != ERROR(dstSize_tooSmall)) {
+ size_t const maxCSize = srcSize - ZSTD_minGain(srcSize, zc->appliedParams.cParams.strategy);
+ FORWARD_IF_ERROR(cSize, "ZSTD_compressSuperBlock failed");
+ if (cSize != 0 && cSize < maxCSize + ZSTD_blockHeaderSize) {
+ ZSTD_confirmRepcodesAndEntropyTables(zc);
+ return cSize;
+ }
+ }
+ }
+ }
+
+ DEBUGLOG(6, "Resorting to ZSTD_noCompressBlock()");
+ /* Superblock compression failed, attempt to emit a single no compress block.
+ * The decoder will be able to stream this block since it is uncompressed.
+ */
+ return ZSTD_noCompressBlock(dst, dstCapacity, src, srcSize, lastBlock);
+}
+
+static size_t ZSTD_compressBlock_targetCBlockSize(ZSTD_CCtx* zc,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ U32 lastBlock)
+{
+ size_t cSize = 0;
+ const size_t bss = ZSTD_buildSeqStore(zc, src, srcSize);
+ DEBUGLOG(5, "ZSTD_compressBlock_targetCBlockSize (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u, srcSize=%zu)",
+ (unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit, (unsigned)zc->blockState.matchState.nextToUpdate, srcSize);
+ FORWARD_IF_ERROR(bss, "ZSTD_buildSeqStore failed");
+
+ cSize = ZSTD_compressBlock_targetCBlockSize_body(zc, dst, dstCapacity, src, srcSize, bss, lastBlock);
+ FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_targetCBlockSize_body failed");
+
+ if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
+ zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
+
+ return cSize;
+}
+
+static void ZSTD_overflowCorrectIfNeeded(ZSTD_matchState_t* ms,
+ ZSTD_cwksp* ws,
+ ZSTD_CCtx_params const* params,
+ void const* ip,
+ void const* iend)
+{
+ if (ZSTD_window_needOverflowCorrection(ms->window, iend)) {
+ U32 const maxDist = (U32)1 << params->cParams.windowLog;
+ U32 const cycleLog = ZSTD_cycleLog(params->cParams.chainLog, params->cParams.strategy);
+ U32 const correction = ZSTD_window_correctOverflow(&ms->window, cycleLog, maxDist, ip);
+ ZSTD_STATIC_ASSERT(ZSTD_CHAINLOG_MAX <= 30);
+ ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX_32 <= 30);
+ ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX <= 31);
+ ZSTD_cwksp_mark_tables_dirty(ws);
+ ZSTD_reduceIndex(ms, params, correction);
+ ZSTD_cwksp_mark_tables_clean(ws);
+ if (ms->nextToUpdate < correction) ms->nextToUpdate = 0;
+ else ms->nextToUpdate -= correction;
+ /* invalidate dictionaries on overflow correction */
+ ms->loadedDictEnd = 0;
+ ms->dictMatchState = NULL;
+ }
+}
+
+/*! ZSTD_compress_frameChunk() :
+* Compress a chunk of data into one or multiple blocks.
+* All blocks will be terminated, all input will be consumed.
+* Function will issue an error if there is not enough `dstCapacity` to hold the compressed content.
+* Frame is supposed already started (header already produced)
+* @return : compressed size, or an error code
+*/
+static size_t ZSTD_compress_frameChunk (ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ U32 lastFrameChunk)
+{
+ size_t blockSize = cctx->blockSize;
+ size_t remaining = srcSize;
+ const BYTE* ip = (const BYTE*)src;
+ BYTE* const ostart = (BYTE*)dst;
+ BYTE* op = ostart;
+ U32 const maxDist = (U32)1 << cctx->appliedParams.cParams.windowLog;
+
+ assert(cctx->appliedParams.cParams.windowLog <= ZSTD_WINDOWLOG_MAX);
+
+ DEBUGLOG(4, "ZSTD_compress_frameChunk (blockSize=%u)", (unsigned)blockSize);
+ if (cctx->appliedParams.fParams.checksumFlag && srcSize)
+ xxh64_update(&cctx->xxhState, src, srcSize);
+
+ while (remaining) {
+ ZSTD_matchState_t* const ms = &cctx->blockState.matchState;
+ U32 const lastBlock = lastFrameChunk & (blockSize >= remaining);
+
+ RETURN_ERROR_IF(dstCapacity < ZSTD_blockHeaderSize + MIN_CBLOCK_SIZE,
+ dstSize_tooSmall,
+ "not enough space to store compressed block");
+ if (remaining < blockSize) blockSize = remaining;
+
+ ZSTD_overflowCorrectIfNeeded(
+ ms, &cctx->workspace, &cctx->appliedParams, ip, ip + blockSize);
+ ZSTD_checkDictValidity(&ms->window, ip + blockSize, maxDist, &ms->loadedDictEnd, &ms->dictMatchState);
+
+ /* Ensure hash/chain table insertion resumes no sooner than lowlimit */
+ if (ms->nextToUpdate < ms->window.lowLimit) ms->nextToUpdate = ms->window.lowLimit;
+
+ { size_t cSize;
+ if (ZSTD_useTargetCBlockSize(&cctx->appliedParams)) {
+ cSize = ZSTD_compressBlock_targetCBlockSize(cctx, op, dstCapacity, ip, blockSize, lastBlock);
+ FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_targetCBlockSize failed");
+ assert(cSize > 0);
+ assert(cSize <= blockSize + ZSTD_blockHeaderSize);
+ } else {
+ cSize = ZSTD_compressBlock_internal(cctx,
+ op+ZSTD_blockHeaderSize, dstCapacity-ZSTD_blockHeaderSize,
+ ip, blockSize, 1 /* frame */);
+ FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_internal failed");
+
+ if (cSize == 0) { /* block is not compressible */
+ cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
+ FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed");
+ } else {
+ U32 const cBlockHeader = cSize == 1 ?
+ lastBlock + (((U32)bt_rle)<<1) + (U32)(blockSize << 3) :
+ lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
+ MEM_writeLE24(op, cBlockHeader);
+ cSize += ZSTD_blockHeaderSize;
+ }
+ }
+
+
+ ip += blockSize;
+ assert(remaining >= blockSize);
+ remaining -= blockSize;
+ op += cSize;
+ assert(dstCapacity >= cSize);
+ dstCapacity -= cSize;
+ cctx->isFirstBlock = 0;
+ DEBUGLOG(5, "ZSTD_compress_frameChunk: adding a block of size %u",
+ (unsigned)cSize);
+ } }
+
+ if (lastFrameChunk && (op>ostart)) cctx->stage = ZSTDcs_ending;
+ return (size_t)(op-ostart);
+}
+
+
+static size_t ZSTD_writeFrameHeader(void* dst, size_t dstCapacity,
+ const ZSTD_CCtx_params* params, U64 pledgedSrcSize, U32 dictID)
+{ BYTE* const op = (BYTE*)dst;
+ U32 const dictIDSizeCodeLength = (dictID>0) + (dictID>=256) + (dictID>=65536); /* 0-3 */
+ U32 const dictIDSizeCode = params->fParams.noDictIDFlag ? 0 : dictIDSizeCodeLength; /* 0-3 */
+ U32 const checksumFlag = params->fParams.checksumFlag>0;
+ U32 const windowSize = (U32)1 << params->cParams.windowLog;
+ U32 const singleSegment = params->fParams.contentSizeFlag && (windowSize >= pledgedSrcSize);
+ BYTE const windowLogByte = (BYTE)((params->cParams.windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN) << 3);
+ U32 const fcsCode = params->fParams.contentSizeFlag ?
+ (pledgedSrcSize>=256) + (pledgedSrcSize>=65536+256) + (pledgedSrcSize>=0xFFFFFFFFU) : 0; /* 0-3 */
+ BYTE const frameHeaderDescriptionByte = (BYTE)(dictIDSizeCode + (checksumFlag<<2) + (singleSegment<<5) + (fcsCode<<6) );
+ size_t pos=0;
+
+ assert(!(params->fParams.contentSizeFlag && pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN));
+ RETURN_ERROR_IF(dstCapacity < ZSTD_FRAMEHEADERSIZE_MAX, dstSize_tooSmall,
+ "dst buf is too small to fit worst-case frame header size.");
+ DEBUGLOG(4, "ZSTD_writeFrameHeader : dictIDFlag : %u ; dictID : %u ; dictIDSizeCode : %u",
+ !params->fParams.noDictIDFlag, (unsigned)dictID, (unsigned)dictIDSizeCode);
+ if (params->format == ZSTD_f_zstd1) {
+ MEM_writeLE32(dst, ZSTD_MAGICNUMBER);
+ pos = 4;
+ }
+ op[pos++] = frameHeaderDescriptionByte;
+ if (!singleSegment) op[pos++] = windowLogByte;
+ switch(dictIDSizeCode)
+ {
+ default:
+ assert(0); /* impossible */
+ ZSTD_FALLTHROUGH;
+ case 0 : break;
+ case 1 : op[pos] = (BYTE)(dictID); pos++; break;
+ case 2 : MEM_writeLE16(op+pos, (U16)dictID); pos+=2; break;
+ case 3 : MEM_writeLE32(op+pos, dictID); pos+=4; break;
+ }
+ switch(fcsCode)
+ {
+ default:
+ assert(0); /* impossible */
+ ZSTD_FALLTHROUGH;
+ case 0 : if (singleSegment) op[pos++] = (BYTE)(pledgedSrcSize); break;
+ case 1 : MEM_writeLE16(op+pos, (U16)(pledgedSrcSize-256)); pos+=2; break;
+ case 2 : MEM_writeLE32(op+pos, (U32)(pledgedSrcSize)); pos+=4; break;
+ case 3 : MEM_writeLE64(op+pos, (U64)(pledgedSrcSize)); pos+=8; break;
+ }
+ return pos;
+}
+
+/* ZSTD_writeSkippableFrame_advanced() :
+ * Writes out a skippable frame with the specified magic number variant (16 are supported),
+ * from ZSTD_MAGIC_SKIPPABLE_START to ZSTD_MAGIC_SKIPPABLE_START+15, and the desired source data.
+ *
+ * Returns the total number of bytes written, or a ZSTD error code.
+ */
+size_t ZSTD_writeSkippableFrame(void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize, unsigned magicVariant) {
+ BYTE* op = (BYTE*)dst;
+ RETURN_ERROR_IF(dstCapacity < srcSize + ZSTD_SKIPPABLEHEADERSIZE /* Skippable frame overhead */,
+ dstSize_tooSmall, "Not enough room for skippable frame");
+ RETURN_ERROR_IF(srcSize > (unsigned)0xFFFFFFFF, srcSize_wrong, "Src size too large for skippable frame");
+ RETURN_ERROR_IF(magicVariant > 15, parameter_outOfBound, "Skippable frame magic number variant not supported");
+
+ MEM_writeLE32(op, (U32)(ZSTD_MAGIC_SKIPPABLE_START + magicVariant));
+ MEM_writeLE32(op+4, (U32)srcSize);
+ ZSTD_memcpy(op+8, src, srcSize);
+ return srcSize + ZSTD_SKIPPABLEHEADERSIZE;
+}
+
+/* ZSTD_writeLastEmptyBlock() :
+ * output an empty Block with end-of-frame mark to complete a frame
+ * @return : size of data written into `dst` (== ZSTD_blockHeaderSize (defined in zstd_internal.h))
+ * or an error code if `dstCapacity` is too small (<ZSTD_blockHeaderSize)
+ */
+size_t ZSTD_writeLastEmptyBlock(void* dst, size_t dstCapacity)
+{
+ RETURN_ERROR_IF(dstCapacity < ZSTD_blockHeaderSize, dstSize_tooSmall,
+ "dst buf is too small to write frame trailer empty block.");
+ { U32 const cBlockHeader24 = 1 /*lastBlock*/ + (((U32)bt_raw)<<1); /* 0 size */
+ MEM_writeLE24(dst, cBlockHeader24);
+ return ZSTD_blockHeaderSize;
+ }
+}
+
+size_t ZSTD_referenceExternalSequences(ZSTD_CCtx* cctx, rawSeq* seq, size_t nbSeq)
+{
+ RETURN_ERROR_IF(cctx->stage != ZSTDcs_init, stage_wrong,
+ "wrong cctx stage");
+ RETURN_ERROR_IF(cctx->appliedParams.ldmParams.enableLdm,
+ parameter_unsupported,
+ "incompatible with ldm");
+ cctx->externSeqStore.seq = seq;
+ cctx->externSeqStore.size = nbSeq;
+ cctx->externSeqStore.capacity = nbSeq;
+ cctx->externSeqStore.pos = 0;
+ cctx->externSeqStore.posInSequence = 0;
+ return 0;
+}
+
+
+static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ U32 frame, U32 lastFrameChunk)
+{
+ ZSTD_matchState_t* const ms = &cctx->blockState.matchState;
+ size_t fhSize = 0;
+
+ DEBUGLOG(5, "ZSTD_compressContinue_internal, stage: %u, srcSize: %u",
+ cctx->stage, (unsigned)srcSize);
+ RETURN_ERROR_IF(cctx->stage==ZSTDcs_created, stage_wrong,
+ "missing init (ZSTD_compressBegin)");
+
+ if (frame && (cctx->stage==ZSTDcs_init)) {
+ fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, &cctx->appliedParams,
+ cctx->pledgedSrcSizePlusOne-1, cctx->dictID);
+ FORWARD_IF_ERROR(fhSize, "ZSTD_writeFrameHeader failed");
+ assert(fhSize <= dstCapacity);
+ dstCapacity -= fhSize;
+ dst = (char*)dst + fhSize;
+ cctx->stage = ZSTDcs_ongoing;
+ }
+
+ if (!srcSize) return fhSize; /* do not generate an empty block if no input */
+
+ if (!ZSTD_window_update(&ms->window, src, srcSize)) {
+ ms->nextToUpdate = ms->window.dictLimit;
+ }
+ if (cctx->appliedParams.ldmParams.enableLdm) {
+ ZSTD_window_update(&cctx->ldmState.window, src, srcSize);
+ }
+
+ if (!frame) {
+ /* overflow check and correction for block mode */
+ ZSTD_overflowCorrectIfNeeded(
+ ms, &cctx->workspace, &cctx->appliedParams,
+ src, (BYTE const*)src + srcSize);
+ }
+
+ DEBUGLOG(5, "ZSTD_compressContinue_internal (blockSize=%u)", (unsigned)cctx->blockSize);
+ { size_t const cSize = frame ?
+ ZSTD_compress_frameChunk (cctx, dst, dstCapacity, src, srcSize, lastFrameChunk) :
+ ZSTD_compressBlock_internal (cctx, dst, dstCapacity, src, srcSize, 0 /* frame */);
+ FORWARD_IF_ERROR(cSize, "%s", frame ? "ZSTD_compress_frameChunk failed" : "ZSTD_compressBlock_internal failed");
+ cctx->consumedSrcSize += srcSize;
+ cctx->producedCSize += (cSize + fhSize);
+ assert(!(cctx->appliedParams.fParams.contentSizeFlag && cctx->pledgedSrcSizePlusOne == 0));
+ if (cctx->pledgedSrcSizePlusOne != 0) { /* control src size */
+ ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN == (unsigned long long)-1);
+ RETURN_ERROR_IF(
+ cctx->consumedSrcSize+1 > cctx->pledgedSrcSizePlusOne,
+ srcSize_wrong,
+ "error : pledgedSrcSize = %u, while realSrcSize >= %u",
+ (unsigned)cctx->pledgedSrcSizePlusOne-1,
+ (unsigned)cctx->consumedSrcSize);
+ }
+ return cSize + fhSize;
+ }
+}
+
+size_t ZSTD_compressContinue (ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize)
+{
+ DEBUGLOG(5, "ZSTD_compressContinue (srcSize=%u)", (unsigned)srcSize);
+ return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1 /* frame mode */, 0 /* last chunk */);
+}
+
+
+size_t ZSTD_getBlockSize(const ZSTD_CCtx* cctx)
+{
+ ZSTD_compressionParameters const cParams = cctx->appliedParams.cParams;
+ assert(!ZSTD_checkCParams(cParams));
+ 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)
+{
+ DEBUGLOG(5, "ZSTD_compressBlock: srcSize = %u", (unsigned)srcSize);
+ { size_t const blockSizeMax = ZSTD_getBlockSize(cctx);
+ RETURN_ERROR_IF(srcSize > blockSizeMax, srcSize_wrong, "input is larger than a block"); }
+
+ return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 0 /* frame mode */, 0 /* last chunk */);
+}
+
+/*! ZSTD_loadDictionaryContent() :
+ * @return : 0, or an error code
+ */
+static size_t ZSTD_loadDictionaryContent(ZSTD_matchState_t* ms,
+ ldmState_t* ls,
+ ZSTD_cwksp* ws,
+ ZSTD_CCtx_params const* params,
+ const void* src, size_t srcSize,
+ ZSTD_dictTableLoadMethod_e dtlm)
+{
+ const BYTE* ip = (const BYTE*) src;
+ const BYTE* const iend = ip + srcSize;
+
+ ZSTD_window_update(&ms->window, src, srcSize);
+ ms->loadedDictEnd = params->forceWindow ? 0 : (U32)(iend - ms->window.base);
+
+ if (params->ldmParams.enableLdm && ls != NULL) {
+ ZSTD_window_update(&ls->window, src, srcSize);
+ ls->loadedDictEnd = params->forceWindow ? 0 : (U32)(iend - ls->window.base);
+ }
+
+ /* Assert that we the ms params match the params we're being given */
+ ZSTD_assertEqualCParams(params->cParams, ms->cParams);
+
+ if (srcSize <= HASH_READ_SIZE) return 0;
+
+ while (iend - ip > HASH_READ_SIZE) {
+ size_t const remaining = (size_t)(iend - ip);
+ size_t const chunk = MIN(remaining, ZSTD_CHUNKSIZE_MAX);
+ const BYTE* const ichunk = ip + chunk;
+
+ ZSTD_overflowCorrectIfNeeded(ms, ws, params, ip, ichunk);
+
+ if (params->ldmParams.enableLdm && ls != NULL)
+ ZSTD_ldm_fillHashTable(ls, (const BYTE*)src, (const BYTE*)src + srcSize, &params->ldmParams);
+
+ switch(params->cParams.strategy)
+ {
+ case ZSTD_fast:
+ ZSTD_fillHashTable(ms, ichunk, dtlm);
+ break;
+ case ZSTD_dfast:
+ ZSTD_fillDoubleHashTable(ms, ichunk, dtlm);
+ break;
+
+ case ZSTD_greedy:
+ case ZSTD_lazy:
+ case ZSTD_lazy2:
+ if (chunk >= HASH_READ_SIZE && ms->dedicatedDictSearch) {
+ assert(chunk == remaining); /* must load everything in one go */
+ ZSTD_dedicatedDictSearch_lazy_loadDictionary(ms, ichunk-HASH_READ_SIZE);
+ } else if (chunk >= HASH_READ_SIZE) {
+ ZSTD_insertAndFindFirstIndex(ms, ichunk-HASH_READ_SIZE);
+ }
+ break;
+
+ case ZSTD_btlazy2: /* we want the dictionary table fully sorted */
+ case ZSTD_btopt:
+ case ZSTD_btultra:
+ case ZSTD_btultra2:
+ if (chunk >= HASH_READ_SIZE)
+ ZSTD_updateTree(ms, ichunk-HASH_READ_SIZE, ichunk);
+ break;
+
+ default:
+ assert(0); /* not possible : not a valid strategy id */
+ }
+
+ ip = ichunk;
+ }
+
+ ms->nextToUpdate = (U32)(iend - ms->window.base);
+ return 0;
+}
+
+
+/* Dictionaries that assign zero probability to symbols that show up causes problems
+ * when FSE encoding. Mark dictionaries with zero probability symbols as FSE_repeat_check
+ * and only dictionaries with 100% valid symbols can be assumed valid.
+ */
+static FSE_repeat ZSTD_dictNCountRepeat(short* normalizedCounter, unsigned dictMaxSymbolValue, unsigned maxSymbolValue)
+{
+ U32 s;
+ if (dictMaxSymbolValue < maxSymbolValue) {
+ return FSE_repeat_check;
+ }
+ for (s = 0; s <= maxSymbolValue; ++s) {
+ if (normalizedCounter[s] == 0) {
+ return FSE_repeat_check;
+ }
+ }
+ return FSE_repeat_valid;
+}
+
+size_t ZSTD_loadCEntropy(ZSTD_compressedBlockState_t* bs, void* workspace,
+ const void* const dict, size_t dictSize)
+{
+ short offcodeNCount[MaxOff+1];
+ unsigned offcodeMaxValue = MaxOff;
+ const BYTE* dictPtr = (const BYTE*)dict; /* skip magic num and dict ID */
+ const BYTE* const dictEnd = dictPtr + dictSize;
+ dictPtr += 8;
+ bs->entropy.huf.repeatMode = HUF_repeat_check;
+
+ { unsigned maxSymbolValue = 255;
+ unsigned hasZeroWeights = 1;
+ size_t const hufHeaderSize = HUF_readCTable((HUF_CElt*)bs->entropy.huf.CTable, &maxSymbolValue, dictPtr,
+ dictEnd-dictPtr, &hasZeroWeights);
+
+ /* We only set the loaded table as valid if it contains all non-zero
+ * weights. Otherwise, we set it to check */
+ if (!hasZeroWeights)
+ bs->entropy.huf.repeatMode = HUF_repeat_valid;
+
+ RETURN_ERROR_IF(HUF_isError(hufHeaderSize), dictionary_corrupted, "");
+ RETURN_ERROR_IF(maxSymbolValue < 255, dictionary_corrupted, "");
+ dictPtr += hufHeaderSize;
+ }
+
+ { unsigned offcodeLog;
+ size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr);
+ RETURN_ERROR_IF(FSE_isError(offcodeHeaderSize), dictionary_corrupted, "");
+ RETURN_ERROR_IF(offcodeLog > OffFSELog, dictionary_corrupted, "");
+ /* fill all offset symbols to avoid garbage at end of table */
+ RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp(
+ bs->entropy.fse.offcodeCTable,
+ offcodeNCount, MaxOff, offcodeLog,
+ workspace, HUF_WORKSPACE_SIZE)),
+ dictionary_corrupted, "");
+ /* Defer checking offcodeMaxValue because we need to know the size of the dictionary content */
+ dictPtr += offcodeHeaderSize;
+ }
+
+ { short matchlengthNCount[MaxML+1];
+ unsigned matchlengthMaxValue = MaxML, matchlengthLog;
+ size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr);
+ RETURN_ERROR_IF(FSE_isError(matchlengthHeaderSize), dictionary_corrupted, "");
+ RETURN_ERROR_IF(matchlengthLog > MLFSELog, dictionary_corrupted, "");
+ RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp(
+ bs->entropy.fse.matchlengthCTable,
+ matchlengthNCount, matchlengthMaxValue, matchlengthLog,
+ workspace, HUF_WORKSPACE_SIZE)),
+ dictionary_corrupted, "");
+ bs->entropy.fse.matchlength_repeatMode = ZSTD_dictNCountRepeat(matchlengthNCount, matchlengthMaxValue, MaxML);
+ dictPtr += matchlengthHeaderSize;
+ }
+
+ { short litlengthNCount[MaxLL+1];
+ unsigned litlengthMaxValue = MaxLL, litlengthLog;
+ size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr);
+ RETURN_ERROR_IF(FSE_isError(litlengthHeaderSize), dictionary_corrupted, "");
+ RETURN_ERROR_IF(litlengthLog > LLFSELog, dictionary_corrupted, "");
+ RETURN_ERROR_IF(FSE_isError(FSE_buildCTable_wksp(
+ bs->entropy.fse.litlengthCTable,
+ litlengthNCount, litlengthMaxValue, litlengthLog,
+ workspace, HUF_WORKSPACE_SIZE)),
+ dictionary_corrupted, "");
+ bs->entropy.fse.litlength_repeatMode = ZSTD_dictNCountRepeat(litlengthNCount, litlengthMaxValue, MaxLL);
+ dictPtr += litlengthHeaderSize;
+ }
+
+ RETURN_ERROR_IF(dictPtr+12 > dictEnd, dictionary_corrupted, "");
+ bs->rep[0] = MEM_readLE32(dictPtr+0);
+ bs->rep[1] = MEM_readLE32(dictPtr+4);
+ bs->rep[2] = MEM_readLE32(dictPtr+8);
+ dictPtr += 12;
+
+ { size_t const dictContentSize = (size_t)(dictEnd - dictPtr);
+ U32 offcodeMax = MaxOff;
+ if (dictContentSize <= ((U32)-1) - 128 KB) {
+ U32 const maxOffset = (U32)dictContentSize + 128 KB; /* The maximum offset that must be supported */
+ offcodeMax = ZSTD_highbit32(maxOffset); /* Calculate minimum offset code required to represent maxOffset */
+ }
+ /* All offset values <= dictContentSize + 128 KB must be representable for a valid table */
+ bs->entropy.fse.offcode_repeatMode = ZSTD_dictNCountRepeat(offcodeNCount, offcodeMaxValue, MIN(offcodeMax, MaxOff));
+
+ /* All repCodes must be <= dictContentSize and != 0 */
+ { U32 u;
+ for (u=0; u<3; u++) {
+ RETURN_ERROR_IF(bs->rep[u] == 0, dictionary_corrupted, "");
+ RETURN_ERROR_IF(bs->rep[u] > dictContentSize, dictionary_corrupted, "");
+ } } }
+
+ return dictPtr - (const BYTE*)dict;
+}
+
+/* Dictionary format :
+ * See :
+ * https://github.com/facebook/zstd/blob/release/doc/zstd_compression_format.md#dictionary-format
+ */
+/*! ZSTD_loadZstdDictionary() :
+ * @return : dictID, or an error code
+ * assumptions : magic number supposed already checked
+ * dictSize supposed >= 8
+ */
+static size_t ZSTD_loadZstdDictionary(ZSTD_compressedBlockState_t* bs,
+ ZSTD_matchState_t* ms,
+ ZSTD_cwksp* ws,
+ ZSTD_CCtx_params const* params,
+ const void* dict, size_t dictSize,
+ ZSTD_dictTableLoadMethod_e dtlm,
+ void* workspace)
+{
+ const BYTE* dictPtr = (const BYTE*)dict;
+ const BYTE* const dictEnd = dictPtr + dictSize;
+ size_t dictID;
+ size_t eSize;
+
+ ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<<MAX(MLFSELog,LLFSELog)));
+ assert(dictSize >= 8);
+ assert(MEM_readLE32(dictPtr) == ZSTD_MAGIC_DICTIONARY);
+
+ dictID = params->fParams.noDictIDFlag ? 0 : MEM_readLE32(dictPtr + 4 /* skip magic number */ );
+ eSize = ZSTD_loadCEntropy(bs, workspace, dict, dictSize);
+ FORWARD_IF_ERROR(eSize, "ZSTD_loadCEntropy failed");
+ dictPtr += eSize;
+
+ {
+ size_t const dictContentSize = (size_t)(dictEnd - dictPtr);
+ FORWARD_IF_ERROR(ZSTD_loadDictionaryContent(
+ ms, NULL, ws, params, dictPtr, dictContentSize, dtlm), "");
+ }
+ return dictID;
+}
+
+/* ZSTD_compress_insertDictionary() :
+* @return : dictID, or an error code */
+static size_t
+ZSTD_compress_insertDictionary(ZSTD_compressedBlockState_t* bs,
+ ZSTD_matchState_t* ms,
+ ldmState_t* ls,
+ ZSTD_cwksp* ws,
+ const ZSTD_CCtx_params* params,
+ const void* dict, size_t dictSize,
+ ZSTD_dictContentType_e dictContentType,
+ ZSTD_dictTableLoadMethod_e dtlm,
+ void* workspace)
+{
+ DEBUGLOG(4, "ZSTD_compress_insertDictionary (dictSize=%u)", (U32)dictSize);
+ if ((dict==NULL) || (dictSize<8)) {
+ RETURN_ERROR_IF(dictContentType == ZSTD_dct_fullDict, dictionary_wrong, "");
+ return 0;
+ }
+
+ ZSTD_reset_compressedBlockState(bs);
+
+ /* dict restricted modes */
+ if (dictContentType == ZSTD_dct_rawContent)
+ return ZSTD_loadDictionaryContent(ms, ls, ws, params, dict, dictSize, dtlm);
+
+ if (MEM_readLE32(dict) != ZSTD_MAGIC_DICTIONARY) {
+ if (dictContentType == ZSTD_dct_auto) {
+ DEBUGLOG(4, "raw content dictionary detected");
+ return ZSTD_loadDictionaryContent(
+ ms, ls, ws, params, dict, dictSize, dtlm);
+ }
+ RETURN_ERROR_IF(dictContentType == ZSTD_dct_fullDict, dictionary_wrong, "");
+ assert(0); /* impossible */
+ }
+
+ /* dict as full zstd dictionary */
+ return ZSTD_loadZstdDictionary(
+ bs, ms, ws, params, dict, dictSize, dtlm, workspace);
+}
+
+#define ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF (128 KB)
+#define ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER (6ULL)
+
+/*! 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_dictContentType_e dictContentType,
+ ZSTD_dictTableLoadMethod_e dtlm,
+ const ZSTD_CDict* cdict,
+ const ZSTD_CCtx_params* params, U64 pledgedSrcSize,
+ ZSTD_buffered_policy_e zbuff)
+{
+ DEBUGLOG(4, "ZSTD_compressBegin_internal: wlog=%u", params->cParams.windowLog);
+ /* params are supposed to be fully validated at this point */
+ assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams)));
+ assert(!((dict) && (cdict))); /* either dict or cdict, not both */
+ if ( (cdict)
+ && (cdict->dictContentSize > 0)
+ && ( pledgedSrcSize < ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF
+ || pledgedSrcSize < cdict->dictContentSize * ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER
+ || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
+ || cdict->compressionLevel == 0)
+ && (params->attachDictPref != ZSTD_dictForceLoad) ) {
+ return ZSTD_resetCCtx_usingCDict(cctx, cdict, params, pledgedSrcSize, zbuff);
+ }
+
+ FORWARD_IF_ERROR( ZSTD_resetCCtx_internal(cctx, *params, pledgedSrcSize,
+ ZSTDcrp_makeClean, zbuff) , "");
+ { size_t const dictID = cdict ?
+ ZSTD_compress_insertDictionary(
+ cctx->blockState.prevCBlock, &cctx->blockState.matchState,
+ &cctx->ldmState, &cctx->workspace, &cctx->appliedParams, cdict->dictContent,
+ cdict->dictContentSize, cdict->dictContentType, dtlm,
+ cctx->entropyWorkspace)
+ : ZSTD_compress_insertDictionary(
+ cctx->blockState.prevCBlock, &cctx->blockState.matchState,
+ &cctx->ldmState, &cctx->workspace, &cctx->appliedParams, dict, dictSize,
+ dictContentType, dtlm, cctx->entropyWorkspace);
+ FORWARD_IF_ERROR(dictID, "ZSTD_compress_insertDictionary failed");
+ assert(dictID <= UINT_MAX);
+ cctx->dictID = (U32)dictID;
+ cctx->dictContentSize = cdict ? cdict->dictContentSize : dictSize;
+ }
+ return 0;
+}
+
+size_t ZSTD_compressBegin_advanced_internal(ZSTD_CCtx* cctx,
+ const void* dict, size_t dictSize,
+ ZSTD_dictContentType_e dictContentType,
+ ZSTD_dictTableLoadMethod_e dtlm,
+ const ZSTD_CDict* cdict,
+ const ZSTD_CCtx_params* params,
+ unsigned long long pledgedSrcSize)
+{
+ DEBUGLOG(4, "ZSTD_compressBegin_advanced_internal: wlog=%u", params->cParams.windowLog);
+ /* compression parameters verification and optimization */
+ FORWARD_IF_ERROR( ZSTD_checkCParams(params->cParams) , "");
+ return ZSTD_compressBegin_internal(cctx,
+ dict, dictSize, dictContentType, dtlm,
+ cdict,
+ params, pledgedSrcSize,
+ ZSTDb_not_buffered);
+}
+
+/*! ZSTD_compressBegin_advanced() :
+* @return : 0, or an error code */
+size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* cctx,
+ const void* dict, size_t dictSize,
+ ZSTD_parameters params, unsigned long long pledgedSrcSize)
+{
+ ZSTD_CCtx_params cctxParams;
+ ZSTD_CCtxParams_init_internal(&cctxParams, &params, ZSTD_NO_CLEVEL);
+ return ZSTD_compressBegin_advanced_internal(cctx,
+ dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast,
+ NULL /*cdict*/,
+ &cctxParams, pledgedSrcSize);
+}
+
+size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel)
+{
+ ZSTD_CCtx_params cctxParams;
+ {
+ ZSTD_parameters const params = ZSTD_getParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_noAttachDict);
+ ZSTD_CCtxParams_init_internal(&cctxParams, &params, (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel);
+ }
+ DEBUGLOG(4, "ZSTD_compressBegin_usingDict (dictSize=%u)", (unsigned)dictSize);
+ return ZSTD_compressBegin_internal(cctx, dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, NULL,
+ &cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, ZSTDb_not_buffered);
+}
+
+size_t ZSTD_compressBegin(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(4, "ZSTD_writeEpilogue");
+ RETURN_ERROR_IF(cctx->stage == ZSTDcs_created, stage_wrong, "init missing");
+
+ /* special case : empty frame */
+ if (cctx->stage == ZSTDcs_init) {
+ fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, &cctx->appliedParams, 0, 0);
+ FORWARD_IF_ERROR(fhSize, "ZSTD_writeFrameHeader failed");
+ dstCapacity -= fhSize;
+ op += fhSize;
+ cctx->stage = ZSTDcs_ongoing;
+ }
+
+ if (cctx->stage != ZSTDcs_ending) {
+ /* write one last empty block, make it the "last" block */
+ U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1) + 0;
+ RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for epilogue");
+ MEM_writeLE32(op, cBlockHeader24);
+ op += ZSTD_blockHeaderSize;
+ dstCapacity -= ZSTD_blockHeaderSize;
+ }
+
+ if (cctx->appliedParams.fParams.checksumFlag) {
+ U32 const checksum = (U32) xxh64_digest(&cctx->xxhState);
+ RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for checksum");
+ DEBUGLOG(4, "ZSTD_writeEpilogue: write checksum : %08X", (unsigned)checksum);
+ MEM_writeLE32(op, checksum);
+ op += 4;
+ }
+
+ cctx->stage = ZSTDcs_created; /* return to "created but no init" status */
+ return op-ostart;
+}
+
+void ZSTD_CCtx_trace(ZSTD_CCtx* cctx, size_t extraCSize)
+{
+ (void)cctx;
+ (void)extraCSize;
+}
+
+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 */);
+ FORWARD_IF_ERROR(cSize, "ZSTD_compressContinue_internal failed");
+ endResult = ZSTD_writeEpilogue(cctx, (char*)dst + cSize, dstCapacity-cSize);
+ FORWARD_IF_ERROR(endResult, "ZSTD_writeEpilogue failed");
+ assert(!(cctx->appliedParams.fParams.contentSizeFlag && cctx->pledgedSrcSizePlusOne == 0));
+ if (cctx->pledgedSrcSizePlusOne != 0) { /* control src size */
+ ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN == (unsigned long long)-1);
+ DEBUGLOG(4, "end of frame : controlling src size");
+ RETURN_ERROR_IF(
+ cctx->pledgedSrcSizePlusOne != cctx->consumedSrcSize+1,
+ srcSize_wrong,
+ "error : pledgedSrcSize = %u, while realSrcSize = %u",
+ (unsigned)cctx->pledgedSrcSizePlusOne-1,
+ (unsigned)cctx->consumedSrcSize);
+ }
+ ZSTD_CCtx_trace(cctx, endResult);
+ return cSize + endResult;
+}
+
+size_t ZSTD_compress_advanced (ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ const void* dict,size_t dictSize,
+ ZSTD_parameters params)
+{
+ ZSTD_CCtx_params cctxParams;
+ DEBUGLOG(4, "ZSTD_compress_advanced");
+ FORWARD_IF_ERROR(ZSTD_checkCParams(params.cParams), "");
+ ZSTD_CCtxParams_init_internal(&cctxParams, &params, ZSTD_NO_CLEVEL);
+ return ZSTD_compress_advanced_internal(cctx,
+ dst, dstCapacity,
+ src, srcSize,
+ dict, dictSize,
+ &cctxParams);
+}
+
+/* Internal */
+size_t ZSTD_compress_advanced_internal(
+ ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ const void* dict,size_t dictSize,
+ const ZSTD_CCtx_params* params)
+{
+ DEBUGLOG(4, "ZSTD_compress_advanced_internal (srcSize:%u)", (unsigned)srcSize);
+ FORWARD_IF_ERROR( ZSTD_compressBegin_internal(cctx,
+ dict, dictSize, ZSTD_dct_auto, ZSTD_dtlm_fast, NULL,
+ params, srcSize, ZSTDb_not_buffered) , "");
+ return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
+}
+
+size_t ZSTD_compress_usingDict(ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ const void* dict, size_t dictSize,
+ int compressionLevel)
+{
+ ZSTD_CCtx_params cctxParams;
+ {
+ ZSTD_parameters const params = ZSTD_getParams_internal(compressionLevel, srcSize, dict ? dictSize : 0, ZSTD_cpm_noAttachDict);
+ assert(params.fParams.contentSizeFlag == 1);
+ ZSTD_CCtxParams_init_internal(&cctxParams, &params, (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT: compressionLevel);
+ }
+ DEBUGLOG(4, "ZSTD_compress_usingDict (srcSize=%u)", (unsigned)srcSize);
+ return ZSTD_compress_advanced_internal(cctx, dst, dstCapacity, src, srcSize, dict, dictSize, &cctxParams);
+}
+
+size_t ZSTD_compressCCtx(ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ int compressionLevel)
+{
+ DEBUGLOG(4, "ZSTD_compressCCtx (srcSize=%u)", (unsigned)srcSize);
+ assert(cctx != NULL);
+ return ZSTD_compress_usingDict(cctx, dst, dstCapacity, src, srcSize, NULL, 0, compressionLevel);
+}
+
+size_t ZSTD_compress(void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize,
+ int compressionLevel)
+{
+ size_t result;
+ ZSTD_CCtx* cctx = ZSTD_createCCtx();
+ RETURN_ERROR_IF(!cctx, memory_allocation, "ZSTD_createCCtx failed");
+ result = ZSTD_compressCCtx(cctx, dst, dstCapacity, src, srcSize, compressionLevel);
+ ZSTD_freeCCtx(cctx);
+ return result;
+}
+
+
+/* ===== Dictionary API ===== */
+
+/*! ZSTD_estimateCDictSize_advanced() :
+ * Estimate amount of memory that will be needed to create a dictionary with following arguments */
+size_t ZSTD_estimateCDictSize_advanced(
+ size_t dictSize, ZSTD_compressionParameters cParams,
+ ZSTD_dictLoadMethod_e dictLoadMethod)
+{
+ DEBUGLOG(5, "sizeof(ZSTD_CDict) : %u", (unsigned)sizeof(ZSTD_CDict));
+ return ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict))
+ + ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE)
+ + ZSTD_sizeof_matchState(&cParams, /* forCCtx */ 0)
+ + (dictLoadMethod == ZSTD_dlm_byRef ? 0
+ : ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void *))));
+}
+
+size_t ZSTD_estimateCDictSize(size_t dictSize, int compressionLevel)
+{
+ ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
+ return ZSTD_estimateCDictSize_advanced(dictSize, cParams, ZSTD_dlm_byCopy);
+}
+
+size_t ZSTD_sizeof_CDict(const ZSTD_CDict* cdict)
+{
+ if (cdict==NULL) return 0; /* support sizeof on NULL */
+ DEBUGLOG(5, "sizeof(*cdict) : %u", (unsigned)sizeof(*cdict));
+ /* cdict may be in the workspace */
+ return (cdict->workspace.workspace == cdict ? 0 : sizeof(*cdict))
+ + ZSTD_cwksp_sizeof(&cdict->workspace);
+}
+
+static size_t ZSTD_initCDict_internal(
+ ZSTD_CDict* cdict,
+ const void* dictBuffer, size_t dictSize,
+ ZSTD_dictLoadMethod_e dictLoadMethod,
+ ZSTD_dictContentType_e dictContentType,
+ ZSTD_CCtx_params params)
+{
+ DEBUGLOG(3, "ZSTD_initCDict_internal (dictContentType:%u)", (unsigned)dictContentType);
+ assert(!ZSTD_checkCParams(params.cParams));
+ cdict->matchState.cParams = params.cParams;
+ cdict->matchState.dedicatedDictSearch = params.enableDedicatedDictSearch;
+ if (cdict->matchState.dedicatedDictSearch && dictSize > ZSTD_CHUNKSIZE_MAX) {
+ cdict->matchState.dedicatedDictSearch = 0;
+ }
+ if ((dictLoadMethod == ZSTD_dlm_byRef) || (!dictBuffer) || (!dictSize)) {
+ cdict->dictContent = dictBuffer;
+ } else {
+ void *internalBuffer = ZSTD_cwksp_reserve_object(&cdict->workspace, ZSTD_cwksp_align(dictSize, sizeof(void*)));
+ RETURN_ERROR_IF(!internalBuffer, memory_allocation, "NULL pointer!");
+ cdict->dictContent = internalBuffer;
+ ZSTD_memcpy(internalBuffer, dictBuffer, dictSize);
+ }
+ cdict->dictContentSize = dictSize;
+ cdict->dictContentType = dictContentType;
+
+ cdict->entropyWorkspace = (U32*)ZSTD_cwksp_reserve_object(&cdict->workspace, HUF_WORKSPACE_SIZE);
+
+
+ /* Reset the state to no dictionary */
+ ZSTD_reset_compressedBlockState(&cdict->cBlockState);
+ FORWARD_IF_ERROR(ZSTD_reset_matchState(
+ &cdict->matchState,
+ &cdict->workspace,
+ &params.cParams,
+ ZSTDcrp_makeClean,
+ ZSTDirp_reset,
+ ZSTD_resetTarget_CDict), "");
+ /* (Maybe) load the dictionary
+ * Skips loading the dictionary if it is < 8 bytes.
+ */
+ { params.compressionLevel = ZSTD_CLEVEL_DEFAULT;
+ params.fParams.contentSizeFlag = 1;
+ { size_t const dictID = ZSTD_compress_insertDictionary(
+ &cdict->cBlockState, &cdict->matchState, NULL, &cdict->workspace,
+ &params, cdict->dictContent, cdict->dictContentSize,
+ dictContentType, ZSTD_dtlm_full, cdict->entropyWorkspace);
+ FORWARD_IF_ERROR(dictID, "ZSTD_compress_insertDictionary failed");
+ assert(dictID <= (size_t)(U32)-1);
+ cdict->dictID = (U32)dictID;
+ }
+ }
+
+ return 0;
+}
+
+static ZSTD_CDict* ZSTD_createCDict_advanced_internal(size_t dictSize,
+ ZSTD_dictLoadMethod_e dictLoadMethod,
+ ZSTD_compressionParameters cParams, ZSTD_customMem customMem)
+{
+ if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
+
+ { size_t const workspaceSize =
+ ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict)) +
+ ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE) +
+ ZSTD_sizeof_matchState(&cParams, /* forCCtx */ 0) +
+ (dictLoadMethod == ZSTD_dlm_byRef ? 0
+ : ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void*))));
+ void* const workspace = ZSTD_customMalloc(workspaceSize, customMem);
+ ZSTD_cwksp ws;
+ ZSTD_CDict* cdict;
+
+ if (!workspace) {
+ ZSTD_customFree(workspace, customMem);
+ return NULL;
+ }
+
+ ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_dynamic_alloc);
+
+ cdict = (ZSTD_CDict*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CDict));
+ assert(cdict != NULL);
+ ZSTD_cwksp_move(&cdict->workspace, &ws);
+ cdict->customMem = customMem;
+ cdict->compressionLevel = ZSTD_NO_CLEVEL; /* signals advanced API usage */
+
+ return cdict;
+ }
+}
+
+ZSTD_CDict* ZSTD_createCDict_advanced(const void* dictBuffer, size_t dictSize,
+ ZSTD_dictLoadMethod_e dictLoadMethod,
+ ZSTD_dictContentType_e dictContentType,
+ ZSTD_compressionParameters cParams,
+ ZSTD_customMem customMem)
+{
+ ZSTD_CCtx_params cctxParams;
+ ZSTD_memset(&cctxParams, 0, sizeof(cctxParams));
+ ZSTD_CCtxParams_init(&cctxParams, 0);
+ cctxParams.cParams = cParams;
+ cctxParams.customMem = customMem;
+ return ZSTD_createCDict_advanced2(
+ dictBuffer, dictSize,
+ dictLoadMethod, dictContentType,
+ &cctxParams, customMem);
+}
+
+ZSTDLIB_API ZSTD_CDict* ZSTD_createCDict_advanced2(
+ const void* dict, size_t dictSize,
+ ZSTD_dictLoadMethod_e dictLoadMethod,
+ ZSTD_dictContentType_e dictContentType,
+ const ZSTD_CCtx_params* originalCctxParams,
+ ZSTD_customMem customMem)
+{
+ ZSTD_CCtx_params cctxParams = *originalCctxParams;
+ ZSTD_compressionParameters cParams;
+ ZSTD_CDict* cdict;
+
+ DEBUGLOG(3, "ZSTD_createCDict_advanced2, mode %u", (unsigned)dictContentType);
+ if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
+
+ if (cctxParams.enableDedicatedDictSearch) {
+ cParams = ZSTD_dedicatedDictSearch_getCParams(
+ cctxParams.compressionLevel, dictSize);
+ ZSTD_overrideCParams(&cParams, &cctxParams.cParams);
+ } else {
+ cParams = ZSTD_getCParamsFromCCtxParams(
+ &cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
+ }
+
+ if (!ZSTD_dedicatedDictSearch_isSupported(&cParams)) {
+ /* Fall back to non-DDSS params */
+ cctxParams.enableDedicatedDictSearch = 0;
+ cParams = ZSTD_getCParamsFromCCtxParams(
+ &cctxParams, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
+ }
+
+ cctxParams.cParams = cParams;
+
+ cdict = ZSTD_createCDict_advanced_internal(dictSize,
+ dictLoadMethod, cctxParams.cParams,
+ customMem);
+
+ if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
+ dict, dictSize,
+ dictLoadMethod, dictContentType,
+ cctxParams) )) {
+ ZSTD_freeCDict(cdict);
+ return NULL;
+ }
+
+ return cdict;
+}
+
+ZSTD_CDict* ZSTD_createCDict(const void* dict, size_t dictSize, int compressionLevel)
+{
+ ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
+ ZSTD_CDict* const cdict = ZSTD_createCDict_advanced(dict, dictSize,
+ ZSTD_dlm_byCopy, ZSTD_dct_auto,
+ cParams, ZSTD_defaultCMem);
+ if (cdict)
+ cdict->compressionLevel = (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel;
+ return cdict;
+}
+
+ZSTD_CDict* ZSTD_createCDict_byReference(const void* dict, size_t dictSize, int compressionLevel)
+{
+ ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize, ZSTD_cpm_createCDict);
+ ZSTD_CDict* const cdict = ZSTD_createCDict_advanced(dict, dictSize,
+ ZSTD_dlm_byRef, ZSTD_dct_auto,
+ cParams, ZSTD_defaultCMem);
+ if (cdict)
+ cdict->compressionLevel = (compressionLevel == 0) ? ZSTD_CLEVEL_DEFAULT : compressionLevel;
+ return cdict;
+}
+
+size_t ZSTD_freeCDict(ZSTD_CDict* cdict)
+{
+ if (cdict==NULL) return 0; /* support free on NULL */
+ { ZSTD_customMem const cMem = cdict->customMem;
+ int cdictInWorkspace = ZSTD_cwksp_owns_buffer(&cdict->workspace, cdict);
+ ZSTD_cwksp_free(&cdict->workspace, cMem);
+ if (!cdictInWorkspace) {
+ ZSTD_customFree(cdict, cMem);
+ }
+ return 0;
+ }
+}
+
+/*! ZSTD_initStaticCDict_advanced() :
+ * Generate a digested dictionary in provided memory area.
+ * workspace: The memory area to emplace the dictionary into.
+ * Provided pointer must 8-bytes aligned.
+ * It must outlive dictionary usage.
+ * workspaceSize: Use ZSTD_estimateCDictSize()
+ * to determine how large workspace must be.
+ * cParams : use ZSTD_getCParams() to transform a compression level
+ * into its relevants cParams.
+ * @return : pointer to ZSTD_CDict*, or NULL if error (size too small)
+ * Note : there is no corresponding "free" function.
+ * Since workspace was allocated externally, it must be freed externally.
+ */
+const ZSTD_CDict* ZSTD_initStaticCDict(
+ void* workspace, size_t workspaceSize,
+ const void* dict, size_t dictSize,
+ ZSTD_dictLoadMethod_e dictLoadMethod,
+ ZSTD_dictContentType_e dictContentType,
+ ZSTD_compressionParameters cParams)
+{
+ size_t const matchStateSize = ZSTD_sizeof_matchState(&cParams, /* forCCtx */ 0);
+ size_t const neededSize = ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict))
+ + (dictLoadMethod == ZSTD_dlm_byRef ? 0
+ : ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void*))))
+ + ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE)
+ + matchStateSize;
+ ZSTD_CDict* cdict;
+ ZSTD_CCtx_params params;
+
+ if ((size_t)workspace & 7) return NULL; /* 8-aligned */
+
+ {
+ ZSTD_cwksp ws;
+ ZSTD_cwksp_init(&ws, workspace, workspaceSize, ZSTD_cwksp_static_alloc);
+ cdict = (ZSTD_CDict*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CDict));
+ if (cdict == NULL) return NULL;
+ ZSTD_cwksp_move(&cdict->workspace, &ws);
+ }
+
+ DEBUGLOG(4, "(workspaceSize < neededSize) : (%u < %u) => %u",
+ (unsigned)workspaceSize, (unsigned)neededSize, (unsigned)(workspaceSize < neededSize));
+ if (workspaceSize < neededSize) return NULL;
+
+ ZSTD_CCtxParams_init(&params, 0);
+ params.cParams = cParams;
+
+ if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
+ dict, dictSize,
+ dictLoadMethod, dictContentType,
+ params) ))
+ return NULL;
+
+ return cdict;
+}
+
+ZSTD_compressionParameters ZSTD_getCParamsFromCDict(const ZSTD_CDict* cdict)
+{
+ assert(cdict != NULL);
+ return cdict->matchState.cParams;
+}
+
+/*! ZSTD_getDictID_fromCDict() :
+ * Provides the dictID of the dictionary loaded into `cdict`.
+ * If @return == 0, the dictionary is not conformant to Zstandard specification, or empty.
+ * Non-conformant dictionaries can still be loaded, but as content-only dictionaries. */
+unsigned ZSTD_getDictID_fromCDict(const ZSTD_CDict* cdict)
+{
+ if (cdict==NULL) return 0;
+ return cdict->dictID;
+}
+
+
+/* ZSTD_compressBegin_usingCDict_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)
+{
+ ZSTD_CCtx_params cctxParams;
+ DEBUGLOG(4, "ZSTD_compressBegin_usingCDict_advanced");
+ RETURN_ERROR_IF(cdict==NULL, dictionary_wrong, "NULL pointer!");
+ /* Initialize the cctxParams from the cdict */
+ {
+ ZSTD_parameters params;
+ params.fParams = fParams;
+ params.cParams = ( pledgedSrcSize < ZSTD_USE_CDICT_PARAMS_SRCSIZE_CUTOFF
+ || pledgedSrcSize < cdict->dictContentSize * ZSTD_USE_CDICT_PARAMS_DICTSIZE_MULTIPLIER
+ || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
+ || cdict->compressionLevel == 0 ) ?
+ ZSTD_getCParamsFromCDict(cdict)
+ : ZSTD_getCParams(cdict->compressionLevel,
+ pledgedSrcSize,
+ cdict->dictContentSize);
+ ZSTD_CCtxParams_init_internal(&cctxParams, &params, cdict->compressionLevel);
+ }
+ /* Increase window log to fit the entire dictionary and source if the
+ * source size is known. Limit the increase to 19, which is the
+ * window log for compression level 1 with the largest source size.
+ */
+ if (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN) {
+ U32 const limitedSrcSize = (U32)MIN(pledgedSrcSize, 1U << 19);
+ U32 const limitedSrcLog = limitedSrcSize > 1 ? ZSTD_highbit32(limitedSrcSize - 1) + 1 : 1;
+ cctxParams.cParams.windowLog = MAX(cctxParams.cParams.windowLog, limitedSrcLog);
+ }
+ return ZSTD_compressBegin_internal(cctx,
+ NULL, 0, ZSTD_dct_auto, ZSTD_dtlm_fast,
+ cdict,
+ &cctxParams, pledgedSrcSize,
+ ZSTDb_not_buffered);
+}
+
+/* ZSTD_compressBegin_usingCDict() :
+ * 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(4, "ZSTD_compressBegin_usingCDict : dictIDFlag == %u", !fParams.noDictIDFlag);
+ return ZSTD_compressBegin_usingCDict_advanced(cctx, cdict, fParams, ZSTD_CONTENTSIZE_UNKNOWN);
+}
+
+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)
+{
+ FORWARD_IF_ERROR(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)
+{
+ DEBUGLOG(3, "ZSTD_createCStream");
+ return ZSTD_createCStream_advanced(ZSTD_defaultCMem);
+}
+
+ZSTD_CStream* ZSTD_initStaticCStream(void *workspace, size_t workspaceSize)
+{
+ return ZSTD_initStaticCCtx(workspace, workspaceSize);
+}
+
+ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem)
+{ /* CStream and CCtx are now same object */
+ return ZSTD_createCCtx_advanced(customMem);
+}
+
+size_t ZSTD_freeCStream(ZSTD_CStream* zcs)
+{
+ return ZSTD_freeCCtx(zcs); /* same object */
+}
+
+
+
+/*====== Initialization ======*/
+
+size_t ZSTD_CStreamInSize(void) { return ZSTD_BLOCKSIZE_MAX; }
+
+size_t ZSTD_CStreamOutSize(void)
+{
+ return ZSTD_compressBound(ZSTD_BLOCKSIZE_MAX) + ZSTD_blockHeaderSize + 4 /* 32-bits hash */ ;
+}
+
+static ZSTD_cParamMode_e ZSTD_getCParamMode(ZSTD_CDict const* cdict, ZSTD_CCtx_params const* params, U64 pledgedSrcSize)
+{
+ if (cdict != NULL && ZSTD_shouldAttachDict(cdict, params, pledgedSrcSize))
+ return ZSTD_cpm_attachDict;
+ else
+ return ZSTD_cpm_noAttachDict;
+}
+
+/* ZSTD_resetCStream():
+ * pledgedSrcSize == 0 means "unknown" */
+size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pss)
+{
+ /* temporary : 0 interpreted as "unknown" during transition period.
+ * Users willing to specify "unknown" **must** use ZSTD_CONTENTSIZE_UNKNOWN.
+ * 0 will be interpreted as "empty" in the future.
+ */
+ U64 const pledgedSrcSize = (pss==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss;
+ DEBUGLOG(4, "ZSTD_resetCStream: pledgedSrcSize = %u", (unsigned)pledgedSrcSize);
+ FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
+ return 0;
+}
+
+/*! ZSTD_initCStream_internal() :
+ * Note : for lib/compress only. Used by zstdmt_compress.c.
+ * Assumption 1 : params are valid
+ * Assumption 2 : either dict, or cdict, is defined, not both */
+size_t ZSTD_initCStream_internal(ZSTD_CStream* zcs,
+ const void* dict, size_t dictSize, const ZSTD_CDict* cdict,
+ const ZSTD_CCtx_params* params,
+ unsigned long long pledgedSrcSize)
+{
+ DEBUGLOG(4, "ZSTD_initCStream_internal");
+ FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
+ assert(!ZSTD_isError(ZSTD_checkCParams(params->cParams)));
+ zcs->requestedParams = *params;
+ assert(!((dict) && (cdict))); /* either dict or cdict, not both */
+ if (dict) {
+ FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , "");
+ } else {
+ /* Dictionary is cleared if !cdict */
+ FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , "");
+ }
+ return 0;
+}
+
+/* ZSTD_initCStream_usingCDict_advanced() :
+ * same as ZSTD_initCStream_usingCDict(), with control over frame parameters */
+size_t ZSTD_initCStream_usingCDict_advanced(ZSTD_CStream* zcs,
+ const ZSTD_CDict* cdict,
+ ZSTD_frameParameters fParams,
+ unsigned long long pledgedSrcSize)
+{
+ DEBUGLOG(4, "ZSTD_initCStream_usingCDict_advanced");
+ FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
+ zcs->requestedParams.fParams = fParams;
+ FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , "");
+ return 0;
+}
+
+/* note : cdict must outlive compression session */
+size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict)
+{
+ DEBUGLOG(4, "ZSTD_initCStream_usingCDict");
+ FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, cdict) , "");
+ return 0;
+}
+
+
+/* ZSTD_initCStream_advanced() :
+ * pledgedSrcSize must be exact.
+ * if srcSize is not known at init time, use value ZSTD_CONTENTSIZE_UNKNOWN.
+ * dict is loaded with default parameters ZSTD_dct_auto and ZSTD_dlm_byCopy. */
+size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs,
+ const void* dict, size_t dictSize,
+ ZSTD_parameters params, unsigned long long pss)
+{
+ /* for compatibility with older programs relying on this behavior.
+ * Users should now specify ZSTD_CONTENTSIZE_UNKNOWN.
+ * This line will be removed in the future.
+ */
+ U64 const pledgedSrcSize = (pss==0 && params.fParams.contentSizeFlag==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss;
+ DEBUGLOG(4, "ZSTD_initCStream_advanced");
+ FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
+ FORWARD_IF_ERROR( ZSTD_checkCParams(params.cParams) , "");
+ ZSTD_CCtxParams_setZstdParams(&zcs->requestedParams, &params);
+ FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , "");
+ return 0;
+}
+
+size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel)
+{
+ DEBUGLOG(4, "ZSTD_initCStream_usingDict");
+ FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_loadDictionary(zcs, dict, dictSize) , "");
+ return 0;
+}
+
+size_t ZSTD_initCStream_srcSize(ZSTD_CStream* zcs, int compressionLevel, unsigned long long pss)
+{
+ /* temporary : 0 interpreted as "unknown" during transition period.
+ * Users willing to specify "unknown" **must** use ZSTD_CONTENTSIZE_UNKNOWN.
+ * 0 will be interpreted as "empty" in the future.
+ */
+ U64 const pledgedSrcSize = (pss==0) ? ZSTD_CONTENTSIZE_UNKNOWN : pss;
+ DEBUGLOG(4, "ZSTD_initCStream_srcSize");
+ FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, NULL) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize) , "");
+ return 0;
+}
+
+size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel)
+{
+ DEBUGLOG(4, "ZSTD_initCStream");
+ FORWARD_IF_ERROR( ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_refCDict(zcs, NULL) , "");
+ FORWARD_IF_ERROR( ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel) , "");
+ return 0;
+}
+
+/*====== Compression ======*/
+
+static size_t ZSTD_nextInputSizeHint(const ZSTD_CCtx* cctx)
+{
+ size_t hintInSize = cctx->inBuffTarget - cctx->inBuffPos;
+ if (hintInSize==0) hintInSize = cctx->blockSize;
+ return hintInSize;
+}
+
+/* ZSTD_compressStream_generic():
+ * internal function for all *compressStream*() variants
+ * non-static, because can be called from zstdmt_compress.c
+ * @return : hint size for next input */
+static 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 = input->size != 0 ? istart + input->size : istart;
+ const char* ip = input->pos != 0 ? istart + input->pos : istart;
+ char* const ostart = (char*)output->dst;
+ char* const oend = output->size != 0 ? ostart + output->size : ostart;
+ char* op = output->pos != 0 ? ostart + output->pos : ostart;
+ U32 someMoreWork = 1;
+
+ /* check expectations */
+ DEBUGLOG(5, "ZSTD_compressStream_generic, flush=%u", (unsigned)flushMode);
+ if (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered) {
+ assert(zcs->inBuff != NULL);
+ assert(zcs->inBuffSize > 0);
+ }
+ if (zcs->appliedParams.outBufferMode == ZSTD_bm_buffered) {
+ assert(zcs->outBuff != NULL);
+ assert(zcs->outBuffSize > 0);
+ }
+ assert(output->pos <= output->size);
+ assert(input->pos <= input->size);
+ assert((U32)flushMode <= (U32)ZSTD_e_end);
+
+ while (someMoreWork) {
+ switch(zcs->streamStage)
+ {
+ case zcss_init:
+ RETURN_ERROR(init_missing, "call ZSTD_initCStream() first!");
+
+ case zcss_load:
+ if ( (flushMode == ZSTD_e_end)
+ && ( (size_t)(oend-op) >= ZSTD_compressBound(iend-ip) /* Enough output space */
+ || zcs->appliedParams.outBufferMode == ZSTD_bm_stable) /* OR we are allowed to return dstSizeTooSmall */
+ && (zcs->inBuffPos == 0) ) {
+ /* shortcut to compression pass directly into output buffer */
+ size_t const cSize = ZSTD_compressEnd(zcs,
+ op, oend-op, ip, iend-ip);
+ DEBUGLOG(4, "ZSTD_compressEnd : cSize=%u", (unsigned)cSize);
+ FORWARD_IF_ERROR(cSize, "ZSTD_compressEnd failed");
+ ip = iend;
+ op += cSize;
+ zcs->frameEnded = 1;
+ ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
+ someMoreWork = 0; break;
+ }
+ /* complete loading into inBuffer in buffered mode */
+ if (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered) {
+ size_t const toLoad = zcs->inBuffTarget - zcs->inBuffPos;
+ size_t const loaded = ZSTD_limitCopy(
+ zcs->inBuff + zcs->inBuffPos, toLoad,
+ ip, iend-ip);
+ zcs->inBuffPos += loaded;
+ if (loaded != 0)
+ 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);
+ { int const inputBuffered = (zcs->appliedParams.inBufferMode == ZSTD_bm_buffered);
+ void* cDst;
+ size_t cSize;
+ size_t oSize = oend-op;
+ size_t const iSize = inputBuffered
+ ? zcs->inBuffPos - zcs->inToCompress
+ : MIN((size_t)(iend - ip), zcs->blockSize);
+ if (oSize >= ZSTD_compressBound(iSize) || zcs->appliedParams.outBufferMode == ZSTD_bm_stable)
+ cDst = op; /* compress into output buffer, to skip flush stage */
+ else
+ cDst = zcs->outBuff, oSize = zcs->outBuffSize;
+ if (inputBuffered) {
+ unsigned const lastBlock = (flushMode == ZSTD_e_end) && (ip==iend);
+ cSize = lastBlock ?
+ ZSTD_compressEnd(zcs, cDst, oSize,
+ zcs->inBuff + zcs->inToCompress, iSize) :
+ ZSTD_compressContinue(zcs, cDst, oSize,
+ zcs->inBuff + zcs->inToCompress, iSize);
+ FORWARD_IF_ERROR(cSize, "%s", lastBlock ? "ZSTD_compressEnd failed" : "ZSTD_compressContinue failed");
+ zcs->frameEnded = lastBlock;
+ /* prepare next block */
+ zcs->inBuffTarget = zcs->inBuffPos + zcs->blockSize;
+ if (zcs->inBuffTarget > zcs->inBuffSize)
+ zcs->inBuffPos = 0, zcs->inBuffTarget = zcs->blockSize;
+ DEBUGLOG(5, "inBuffTarget:%u / inBuffSize:%u",
+ (unsigned)zcs->inBuffTarget, (unsigned)zcs->inBuffSize);
+ if (!lastBlock)
+ assert(zcs->inBuffTarget <= zcs->inBuffSize);
+ zcs->inToCompress = zcs->inBuffPos;
+ } else {
+ unsigned const lastBlock = (ip + iSize == iend);
+ assert(flushMode == ZSTD_e_end /* Already validated */);
+ cSize = lastBlock ?
+ ZSTD_compressEnd(zcs, cDst, oSize, ip, iSize) :
+ ZSTD_compressContinue(zcs, cDst, oSize, ip, iSize);
+ /* Consume the input prior to error checking to mirror buffered mode. */
+ if (iSize > 0)
+ ip += iSize;
+ FORWARD_IF_ERROR(cSize, "%s", lastBlock ? "ZSTD_compressEnd failed" : "ZSTD_compressContinue failed");
+ zcs->frameEnded = lastBlock;
+ if (lastBlock)
+ assert(ip == iend);
+ }
+ if (cDst == op) { /* no need to flush */
+ op += cSize;
+ if (zcs->frameEnded) {
+ DEBUGLOG(5, "Frame completed directly in outBuffer");
+ someMoreWork = 0;
+ ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
+ }
+ break;
+ }
+ zcs->outBuffContentSize = cSize;
+ zcs->outBuffFlushedSize = 0;
+ zcs->streamStage = zcss_flush; /* pass-through to flush stage */
+ }
+ ZSTD_FALLTHROUGH;
+ case zcss_flush:
+ DEBUGLOG(5, "flush stage");
+ assert(zcs->appliedParams.outBufferMode == ZSTD_bm_buffered);
+ { size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize;
+ size_t const flushed = ZSTD_limitCopy(op, (size_t)(oend-op),
+ zcs->outBuff + zcs->outBuffFlushedSize, toFlush);
+ DEBUGLOG(5, "toFlush: %u into %u ==> flushed: %u",
+ (unsigned)toFlush, (unsigned)(oend-op), (unsigned)flushed);
+ if (flushed)
+ op += flushed;
+ zcs->outBuffFlushedSize += flushed;
+ if (toFlush!=flushed) {
+ /* flush not fully completed, presumably because dst is too small */
+ assert(op==oend);
+ someMoreWork = 0;
+ break;
+ }
+ zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0;
+ if (zcs->frameEnded) {
+ DEBUGLOG(5, "Frame completed on flush");
+ someMoreWork = 0;
+ ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
+ break;
+ }
+ zcs->streamStage = zcss_load;
+ break;
+ }
+
+ default: /* impossible */
+ assert(0);
+ }
+ }
+
+ input->pos = ip - istart;
+ output->pos = op - ostart;
+ if (zcs->frameEnded) return 0;
+ return ZSTD_nextInputSizeHint(zcs);
+}
+
+static size_t ZSTD_nextInputSizeHint_MTorST(const ZSTD_CCtx* cctx)
+{
+ return ZSTD_nextInputSizeHint(cctx);
+
+}
+
+size_t ZSTD_compressStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
+{
+ FORWARD_IF_ERROR( ZSTD_compressStream2(zcs, output, input, ZSTD_e_continue) , "");
+ return ZSTD_nextInputSizeHint_MTorST(zcs);
+}
+
+/* After a compression call set the expected input/output buffer.
+ * This is validated at the start of the next compression call.
+ */
+static void ZSTD_setBufferExpectations(ZSTD_CCtx* cctx, ZSTD_outBuffer const* output, ZSTD_inBuffer const* input)
+{
+ if (cctx->appliedParams.inBufferMode == ZSTD_bm_stable) {
+ cctx->expectedInBuffer = *input;
+ }
+ if (cctx->appliedParams.outBufferMode == ZSTD_bm_stable) {
+ cctx->expectedOutBufferSize = output->size - output->pos;
+ }
+}
+
+/* Validate that the input/output buffers match the expectations set by
+ * ZSTD_setBufferExpectations.
+ */
+static size_t ZSTD_checkBufferStability(ZSTD_CCtx const* cctx,
+ ZSTD_outBuffer const* output,
+ ZSTD_inBuffer const* input,
+ ZSTD_EndDirective endOp)
+{
+ if (cctx->appliedParams.inBufferMode == ZSTD_bm_stable) {
+ ZSTD_inBuffer const expect = cctx->expectedInBuffer;
+ if (expect.src != input->src || expect.pos != input->pos || expect.size != input->size)
+ RETURN_ERROR(srcBuffer_wrong, "ZSTD_c_stableInBuffer enabled but input differs!");
+ if (endOp != ZSTD_e_end)
+ RETURN_ERROR(srcBuffer_wrong, "ZSTD_c_stableInBuffer can only be used with ZSTD_e_end!");
+ }
+ if (cctx->appliedParams.outBufferMode == ZSTD_bm_stable) {
+ size_t const outBufferSize = output->size - output->pos;
+ if (cctx->expectedOutBufferSize != outBufferSize)
+ RETURN_ERROR(dstBuffer_wrong, "ZSTD_c_stableOutBuffer enabled but output size differs!");
+ }
+ return 0;
+}
+
+static size_t ZSTD_CCtx_init_compressStream2(ZSTD_CCtx* cctx,
+ ZSTD_EndDirective endOp,
+ size_t inSize) {
+ ZSTD_CCtx_params params = cctx->requestedParams;
+ ZSTD_prefixDict const prefixDict = cctx->prefixDict;
+ FORWARD_IF_ERROR( ZSTD_initLocalDict(cctx) , ""); /* Init the local dict if present. */
+ ZSTD_memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); /* single usage */
+ assert(prefixDict.dict==NULL || cctx->cdict==NULL); /* only one can be set */
+ if (cctx->cdict)
+ params.compressionLevel = cctx->cdict->compressionLevel; /* let cdict take priority in terms of compression level */
+ DEBUGLOG(4, "ZSTD_compressStream2 : transparent init stage");
+ if (endOp == ZSTD_e_end) cctx->pledgedSrcSizePlusOne = inSize + 1; /* auto-fix pledgedSrcSize */
+ {
+ size_t const dictSize = prefixDict.dict
+ ? prefixDict.dictSize
+ : (cctx->cdict ? cctx->cdict->dictContentSize : 0);
+ ZSTD_cParamMode_e const mode = ZSTD_getCParamMode(cctx->cdict, &params, cctx->pledgedSrcSizePlusOne - 1);
+ params.cParams = ZSTD_getCParamsFromCCtxParams(
+ &params, cctx->pledgedSrcSizePlusOne-1,
+ dictSize, mode);
+ }
+
+ if (ZSTD_CParams_shouldEnableLdm(&params.cParams)) {
+ /* Enable LDM by default for optimal parser and window size >= 128MB */
+ DEBUGLOG(4, "LDM enabled by default (window size >= 128MB, strategy >= btopt)");
+ params.ldmParams.enableLdm = 1;
+ }
+
+ { U64 const pledgedSrcSize = cctx->pledgedSrcSizePlusOne - 1;
+ assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
+ FORWARD_IF_ERROR( ZSTD_compressBegin_internal(cctx,
+ prefixDict.dict, prefixDict.dictSize, prefixDict.dictContentType, ZSTD_dtlm_fast,
+ cctx->cdict,
+ &params, pledgedSrcSize,
+ ZSTDb_buffered) , "");
+ assert(cctx->appliedParams.nbWorkers == 0);
+ cctx->inToCompress = 0;
+ cctx->inBuffPos = 0;
+ if (cctx->appliedParams.inBufferMode == ZSTD_bm_buffered) {
+ /* for small input: avoid automatic flush on reaching end of block, since
+ * it would require to add a 3-bytes null block to end frame
+ */
+ cctx->inBuffTarget = cctx->blockSize + (cctx->blockSize == pledgedSrcSize);
+ } else {
+ cctx->inBuffTarget = 0;
+ }
+ cctx->outBuffContentSize = cctx->outBuffFlushedSize = 0;
+ cctx->streamStage = zcss_load;
+ cctx->frameEnded = 0;
+ }
+ return 0;
+}
+
+size_t ZSTD_compressStream2( ZSTD_CCtx* cctx,
+ ZSTD_outBuffer* output,
+ ZSTD_inBuffer* input,
+ ZSTD_EndDirective endOp)
+{
+ DEBUGLOG(5, "ZSTD_compressStream2, endOp=%u ", (unsigned)endOp);
+ /* check conditions */
+ RETURN_ERROR_IF(output->pos > output->size, dstSize_tooSmall, "invalid output buffer");
+ RETURN_ERROR_IF(input->pos > input->size, srcSize_wrong, "invalid input buffer");
+ RETURN_ERROR_IF((U32)endOp > (U32)ZSTD_e_end, parameter_outOfBound, "invalid endDirective");
+ assert(cctx != NULL);
+
+ /* transparent initialization stage */
+ if (cctx->streamStage == zcss_init) {
+ FORWARD_IF_ERROR(ZSTD_CCtx_init_compressStream2(cctx, endOp, input->size), "CompressStream2 initialization failed");
+ ZSTD_setBufferExpectations(cctx, output, input); /* Set initial buffer expectations now that we've initialized */
+ }
+ /* end of transparent initialization stage */
+
+ FORWARD_IF_ERROR(ZSTD_checkBufferStability(cctx, output, input, endOp), "invalid buffers");
+ /* compression stage */
+ FORWARD_IF_ERROR( ZSTD_compressStream_generic(cctx, output, input, endOp) , "");
+ DEBUGLOG(5, "completed ZSTD_compressStream2");
+ ZSTD_setBufferExpectations(cctx, output, input);
+ return cctx->outBuffContentSize - cctx->outBuffFlushedSize; /* remaining to flush */
+}
+
+size_t ZSTD_compressStream2_simpleArgs (
+ ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity, size_t* dstPos,
+ const void* src, size_t srcSize, size_t* srcPos,
+ ZSTD_EndDirective endOp)
+{
+ ZSTD_outBuffer output = { dst, dstCapacity, *dstPos };
+ ZSTD_inBuffer input = { src, srcSize, *srcPos };
+ /* ZSTD_compressStream2() will check validity of dstPos and srcPos */
+ size_t const cErr = ZSTD_compressStream2(cctx, &output, &input, endOp);
+ *dstPos = output.pos;
+ *srcPos = input.pos;
+ return cErr;
+}
+
+size_t ZSTD_compress2(ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const void* src, size_t srcSize)
+{
+ ZSTD_bufferMode_e const originalInBufferMode = cctx->requestedParams.inBufferMode;
+ ZSTD_bufferMode_e const originalOutBufferMode = cctx->requestedParams.outBufferMode;
+ DEBUGLOG(4, "ZSTD_compress2 (srcSize=%u)", (unsigned)srcSize);
+ ZSTD_CCtx_reset(cctx, ZSTD_reset_session_only);
+ /* Enable stable input/output buffers. */
+ cctx->requestedParams.inBufferMode = ZSTD_bm_stable;
+ cctx->requestedParams.outBufferMode = ZSTD_bm_stable;
+ { size_t oPos = 0;
+ size_t iPos = 0;
+ size_t const result = ZSTD_compressStream2_simpleArgs(cctx,
+ dst, dstCapacity, &oPos,
+ src, srcSize, &iPos,
+ ZSTD_e_end);
+ /* Reset to the original values. */
+ cctx->requestedParams.inBufferMode = originalInBufferMode;
+ cctx->requestedParams.outBufferMode = originalOutBufferMode;
+ FORWARD_IF_ERROR(result, "ZSTD_compressStream2_simpleArgs failed");
+ if (result != 0) { /* compression not completed, due to lack of output space */
+ assert(oPos == dstCapacity);
+ RETURN_ERROR(dstSize_tooSmall, "");
+ }
+ assert(iPos == srcSize); /* all input is expected consumed */
+ return oPos;
+ }
+}
+
+typedef struct {
+ U32 idx; /* Index in array of ZSTD_Sequence */
+ U32 posInSequence; /* Position within sequence at idx */
+ size_t posInSrc; /* Number of bytes given by sequences provided so far */
+} ZSTD_sequencePosition;
+
+/* Returns a ZSTD error code if sequence is not valid */
+static size_t ZSTD_validateSequence(U32 offCode, U32 matchLength,
+ size_t posInSrc, U32 windowLog, size_t dictSize, U32 minMatch) {
+ size_t offsetBound;
+ U32 windowSize = 1 << windowLog;
+ /* posInSrc represents the amount of data the the decoder would decode up to this point.
+ * As long as the amount of data decoded is less than or equal to window size, offsets may be
+ * larger than the total length of output decoded in order to reference the dict, even larger than
+ * window size. After output surpasses windowSize, we're limited to windowSize offsets again.
+ */
+ offsetBound = posInSrc > windowSize ? (size_t)windowSize : posInSrc + (size_t)dictSize;
+ RETURN_ERROR_IF(offCode > offsetBound + ZSTD_REP_MOVE, corruption_detected, "Offset too large!");
+ RETURN_ERROR_IF(matchLength < minMatch, corruption_detected, "Matchlength too small");
+ return 0;
+}
+
+/* Returns an offset code, given a sequence's raw offset, the ongoing repcode array, and whether litLength == 0 */
+static U32 ZSTD_finalizeOffCode(U32 rawOffset, const U32 rep[ZSTD_REP_NUM], U32 ll0) {
+ U32 offCode = rawOffset + ZSTD_REP_MOVE;
+ U32 repCode = 0;
+
+ if (!ll0 && rawOffset == rep[0]) {
+ repCode = 1;
+ } else if (rawOffset == rep[1]) {
+ repCode = 2 - ll0;
+ } else if (rawOffset == rep[2]) {
+ repCode = 3 - ll0;
+ } else if (ll0 && rawOffset == rep[0] - 1) {
+ repCode = 3;
+ }
+ if (repCode) {
+ /* ZSTD_storeSeq expects a number in the range [0, 2] to represent a repcode */
+ offCode = repCode - 1;
+ }
+ return offCode;
+}
+
+/* Returns 0 on success, and a ZSTD_error otherwise. This function scans through an array of
+ * ZSTD_Sequence, storing the sequences it finds, until it reaches a block delimiter.
+ */
+static size_t ZSTD_copySequencesToSeqStoreExplicitBlockDelim(ZSTD_CCtx* cctx, ZSTD_sequencePosition* seqPos,
+ const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
+ const void* src, size_t blockSize) {
+ U32 idx = seqPos->idx;
+ BYTE const* ip = (BYTE const*)(src);
+ const BYTE* const iend = ip + blockSize;
+ repcodes_t updatedRepcodes;
+ U32 dictSize;
+ U32 litLength;
+ U32 matchLength;
+ U32 ll0;
+ U32 offCode;
+
+ if (cctx->cdict) {
+ dictSize = (U32)cctx->cdict->dictContentSize;
+ } else if (cctx->prefixDict.dict) {
+ dictSize = (U32)cctx->prefixDict.dictSize;
+ } else {
+ dictSize = 0;
+ }
+ ZSTD_memcpy(updatedRepcodes.rep, cctx->blockState.prevCBlock->rep, sizeof(repcodes_t));
+ for (; (inSeqs[idx].matchLength != 0 || inSeqs[idx].offset != 0) && idx < inSeqsSize; ++idx) {
+ litLength = inSeqs[idx].litLength;
+ matchLength = inSeqs[idx].matchLength;
+ ll0 = litLength == 0;
+ offCode = ZSTD_finalizeOffCode(inSeqs[idx].offset, updatedRepcodes.rep, ll0);
+ updatedRepcodes = ZSTD_updateRep(updatedRepcodes.rep, offCode, ll0);
+
+ DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offCode, matchLength, litLength);
+ if (cctx->appliedParams.validateSequences) {
+ seqPos->posInSrc += litLength + matchLength;
+ FORWARD_IF_ERROR(ZSTD_validateSequence(offCode, matchLength, seqPos->posInSrc,
+ cctx->appliedParams.cParams.windowLog, dictSize,
+ cctx->appliedParams.cParams.minMatch),
+ "Sequence validation failed");
+ }
+ RETURN_ERROR_IF(idx - seqPos->idx > cctx->seqStore.maxNbSeq, memory_allocation,
+ "Not enough memory allocated. Try adjusting ZSTD_c_minMatch.");
+ ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offCode, matchLength - MINMATCH);
+ ip += matchLength + litLength;
+ }
+ ZSTD_memcpy(cctx->blockState.nextCBlock->rep, updatedRepcodes.rep, sizeof(repcodes_t));
+
+ if (inSeqs[idx].litLength) {
+ DEBUGLOG(6, "Storing last literals of size: %u", inSeqs[idx].litLength);
+ ZSTD_storeLastLiterals(&cctx->seqStore, ip, inSeqs[idx].litLength);
+ ip += inSeqs[idx].litLength;
+ seqPos->posInSrc += inSeqs[idx].litLength;
+ }
+ RETURN_ERROR_IF(ip != iend, corruption_detected, "Blocksize doesn't agree with block delimiter!");
+ seqPos->idx = idx+1;
+ return 0;
+}
+
+/* Returns the number of bytes to move the current read position back by. Only non-zero
+ * if we ended up splitting a sequence. Otherwise, it may return a ZSTD error if something
+ * went wrong.
+ *
+ * This function will attempt to scan through blockSize bytes represented by the sequences
+ * in inSeqs, storing any (partial) sequences.
+ *
+ * Occasionally, we may want to change the actual number of bytes we consumed from inSeqs to
+ * avoid splitting a match, or to avoid splitting a match such that it would produce a match
+ * smaller than MINMATCH. In this case, we return the number of bytes that we didn't read from this block.
+ */
+static size_t ZSTD_copySequencesToSeqStoreNoBlockDelim(ZSTD_CCtx* cctx, ZSTD_sequencePosition* seqPos,
+ const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
+ const void* src, size_t blockSize) {
+ U32 idx = seqPos->idx;
+ U32 startPosInSequence = seqPos->posInSequence;
+ U32 endPosInSequence = seqPos->posInSequence + (U32)blockSize;
+ size_t dictSize;
+ BYTE const* ip = (BYTE const*)(src);
+ BYTE const* iend = ip + blockSize; /* May be adjusted if we decide to process fewer than blockSize bytes */
+ repcodes_t updatedRepcodes;
+ U32 bytesAdjustment = 0;
+ U32 finalMatchSplit = 0;
+ U32 litLength;
+ U32 matchLength;
+ U32 rawOffset;
+ U32 offCode;
+
+ if (cctx->cdict) {
+ dictSize = cctx->cdict->dictContentSize;
+ } else if (cctx->prefixDict.dict) {
+ dictSize = cctx->prefixDict.dictSize;
+ } else {
+ dictSize = 0;
+ }
+ DEBUGLOG(5, "ZSTD_copySequencesToSeqStore: idx: %u PIS: %u blockSize: %zu", idx, startPosInSequence, blockSize);
+ DEBUGLOG(5, "Start seq: idx: %u (of: %u ml: %u ll: %u)", idx, inSeqs[idx].offset, inSeqs[idx].matchLength, inSeqs[idx].litLength);
+ ZSTD_memcpy(updatedRepcodes.rep, cctx->blockState.prevCBlock->rep, sizeof(repcodes_t));
+ while (endPosInSequence && idx < inSeqsSize && !finalMatchSplit) {
+ const ZSTD_Sequence currSeq = inSeqs[idx];
+ litLength = currSeq.litLength;
+ matchLength = currSeq.matchLength;
+ rawOffset = currSeq.offset;
+
+ /* Modify the sequence depending on where endPosInSequence lies */
+ if (endPosInSequence >= currSeq.litLength + currSeq.matchLength) {
+ if (startPosInSequence >= litLength) {
+ startPosInSequence -= litLength;
+ litLength = 0;
+ matchLength -= startPosInSequence;
+ } else {
+ litLength -= startPosInSequence;
+ }
+ /* Move to the next sequence */
+ endPosInSequence -= currSeq.litLength + currSeq.matchLength;
+ startPosInSequence = 0;
+ idx++;
+ } else {
+ /* This is the final (partial) sequence we're adding from inSeqs, and endPosInSequence
+ does not reach the end of the match. So, we have to split the sequence */
+ DEBUGLOG(6, "Require a split: diff: %u, idx: %u PIS: %u",
+ currSeq.litLength + currSeq.matchLength - endPosInSequence, idx, endPosInSequence);
+ if (endPosInSequence > litLength) {
+ U32 firstHalfMatchLength;
+ litLength = startPosInSequence >= litLength ? 0 : litLength - startPosInSequence;
+ firstHalfMatchLength = endPosInSequence - startPosInSequence - litLength;
+ if (matchLength > blockSize && firstHalfMatchLength >= cctx->appliedParams.cParams.minMatch) {
+ /* Only ever split the match if it is larger than the block size */
+ U32 secondHalfMatchLength = currSeq.matchLength + currSeq.litLength - endPosInSequence;
+ if (secondHalfMatchLength < cctx->appliedParams.cParams.minMatch) {
+ /* Move the endPosInSequence backward so that it creates match of minMatch length */
+ endPosInSequence -= cctx->appliedParams.cParams.minMatch - secondHalfMatchLength;
+ bytesAdjustment = cctx->appliedParams.cParams.minMatch - secondHalfMatchLength;
+ firstHalfMatchLength -= bytesAdjustment;
+ }
+ matchLength = firstHalfMatchLength;
+ /* Flag that we split the last match - after storing the sequence, exit the loop,
+ but keep the value of endPosInSequence */
+ finalMatchSplit = 1;
+ } else {
+ /* Move the position in sequence backwards so that we don't split match, and break to store
+ * the last literals. We use the original currSeq.litLength as a marker for where endPosInSequence
+ * should go. We prefer to do this whenever it is not necessary to split the match, or if doing so
+ * would cause the first half of the match to be too small
+ */
+ bytesAdjustment = endPosInSequence - currSeq.litLength;
+ endPosInSequence = currSeq.litLength;
+ break;
+ }
+ } else {
+ /* This sequence ends inside the literals, break to store the last literals */
+ break;
+ }
+ }
+ /* Check if this offset can be represented with a repcode */
+ { U32 ll0 = (litLength == 0);
+ offCode = ZSTD_finalizeOffCode(rawOffset, updatedRepcodes.rep, ll0);
+ updatedRepcodes = ZSTD_updateRep(updatedRepcodes.rep, offCode, ll0);
+ }
+
+ if (cctx->appliedParams.validateSequences) {
+ seqPos->posInSrc += litLength + matchLength;
+ FORWARD_IF_ERROR(ZSTD_validateSequence(offCode, matchLength, seqPos->posInSrc,
+ cctx->appliedParams.cParams.windowLog, dictSize,
+ cctx->appliedParams.cParams.minMatch),
+ "Sequence validation failed");
+ }
+ DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offCode, matchLength, litLength);
+ RETURN_ERROR_IF(idx - seqPos->idx > cctx->seqStore.maxNbSeq, memory_allocation,
+ "Not enough memory allocated. Try adjusting ZSTD_c_minMatch.");
+ ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offCode, matchLength - MINMATCH);
+ ip += matchLength + litLength;
+ }
+ DEBUGLOG(5, "Ending seq: idx: %u (of: %u ml: %u ll: %u)", idx, inSeqs[idx].offset, inSeqs[idx].matchLength, inSeqs[idx].litLength);
+ assert(idx == inSeqsSize || endPosInSequence <= inSeqs[idx].litLength + inSeqs[idx].matchLength);
+ seqPos->idx = idx;
+ seqPos->posInSequence = endPosInSequence;
+ ZSTD_memcpy(cctx->blockState.nextCBlock->rep, updatedRepcodes.rep, sizeof(repcodes_t));
+
+ iend -= bytesAdjustment;
+ if (ip != iend) {
+ /* Store any last literals */
+ U32 lastLLSize = (U32)(iend - ip);
+ assert(ip <= iend);
+ DEBUGLOG(6, "Storing last literals of size: %u", lastLLSize);
+ ZSTD_storeLastLiterals(&cctx->seqStore, ip, lastLLSize);
+ seqPos->posInSrc += lastLLSize;
+ }
+
+ return bytesAdjustment;
+}
+
+typedef size_t (*ZSTD_sequenceCopier) (ZSTD_CCtx* cctx, ZSTD_sequencePosition* seqPos,
+ const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
+ const void* src, size_t blockSize);
+static ZSTD_sequenceCopier ZSTD_selectSequenceCopier(ZSTD_sequenceFormat_e mode) {
+ ZSTD_sequenceCopier sequenceCopier = NULL;
+ assert(ZSTD_cParam_withinBounds(ZSTD_c_blockDelimiters, mode));
+ if (mode == ZSTD_sf_explicitBlockDelimiters) {
+ return ZSTD_copySequencesToSeqStoreExplicitBlockDelim;
+ } else if (mode == ZSTD_sf_noBlockDelimiters) {
+ return ZSTD_copySequencesToSeqStoreNoBlockDelim;
+ }
+ assert(sequenceCopier != NULL);
+ return sequenceCopier;
+}
+
+/* Compress, block-by-block, all of the sequences given.
+ *
+ * Returns the cumulative size of all compressed blocks (including their headers), otherwise a ZSTD error.
+ */
+static size_t ZSTD_compressSequences_internal(ZSTD_CCtx* cctx,
+ void* dst, size_t dstCapacity,
+ const ZSTD_Sequence* inSeqs, size_t inSeqsSize,
+ const void* src, size_t srcSize) {
+ size_t cSize = 0;
+ U32 lastBlock;
+ size_t blockSize;
+ size_t compressedSeqsSize;
+ size_t remaining = srcSize;
+ ZSTD_sequencePosition seqPos = {0, 0, 0};
+
+ BYTE const* ip = (BYTE const*)src;
+ BYTE* op = (BYTE*)dst;
+ ZSTD_sequenceCopier sequenceCopier = ZSTD_selectSequenceCopier(cctx->appliedParams.blockDelimiters);
+
+ DEBUGLOG(4, "ZSTD_compressSequences_internal srcSize: %zu, inSeqsSize: %zu", srcSize, inSeqsSize);
+ /* Special case: empty frame */
+ if (remaining == 0) {
+ U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1);
+ RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "No room for empty frame block header");
+ MEM_writeLE32(op, cBlockHeader24);
+ op += ZSTD_blockHeaderSize;
+ dstCapacity -= ZSTD_blockHeaderSize;
+ cSize += ZSTD_blockHeaderSize;
+ }
+
+ while (remaining) {
+ size_t cBlockSize;
+ size_t additionalByteAdjustment;
+ lastBlock = remaining <= cctx->blockSize;
+ blockSize = lastBlock ? (U32)remaining : (U32)cctx->blockSize;
+ ZSTD_resetSeqStore(&cctx->seqStore);
+ DEBUGLOG(4, "Working on new block. Blocksize: %zu", blockSize);
+
+ additionalByteAdjustment = sequenceCopier(cctx, &seqPos, inSeqs, inSeqsSize, ip, blockSize);
+ FORWARD_IF_ERROR(additionalByteAdjustment, "Bad sequence copy");
+ blockSize -= additionalByteAdjustment;
+
+ /* If blocks are too small, emit as a nocompress block */
+ if (blockSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) {
+ cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
+ FORWARD_IF_ERROR(cBlockSize, "Nocompress block failed");
+ DEBUGLOG(4, "Block too small, writing out nocompress block: cSize: %zu", cBlockSize);
+ cSize += cBlockSize;
+ ip += blockSize;
+ op += cBlockSize;
+ remaining -= blockSize;
+ dstCapacity -= cBlockSize;
+ continue;
+ }
+
+ compressedSeqsSize = ZSTD_entropyCompressSequences(&cctx->seqStore,
+ &cctx->blockState.prevCBlock->entropy, &cctx->blockState.nextCBlock->entropy,
+ &cctx->appliedParams,
+ op + ZSTD_blockHeaderSize /* Leave space for block header */, dstCapacity - ZSTD_blockHeaderSize,
+ blockSize,
+ cctx->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */,
+ cctx->bmi2);
+ FORWARD_IF_ERROR(compressedSeqsSize, "Compressing sequences of block failed");
+ DEBUGLOG(4, "Compressed sequences size: %zu", compressedSeqsSize);
+
+ if (!cctx->isFirstBlock &&
+ ZSTD_maybeRLE(&cctx->seqStore) &&
+ ZSTD_isRLE((BYTE const*)src, srcSize)) {
+ /* We don't want to emit our first block as a RLE even if it qualifies because
+ * doing so will cause the decoder (cli only) to throw a "should consume all input error."
+ * This is only an issue for zstd <= v1.4.3
+ */
+ compressedSeqsSize = 1;
+ }
+
+ if (compressedSeqsSize == 0) {
+ /* ZSTD_noCompressBlock writes the block header as well */
+ cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
+ FORWARD_IF_ERROR(cBlockSize, "Nocompress block failed");
+ DEBUGLOG(4, "Writing out nocompress block, size: %zu", cBlockSize);
+ } else if (compressedSeqsSize == 1) {
+ cBlockSize = ZSTD_rleCompressBlock(op, dstCapacity, *ip, blockSize, lastBlock);
+ FORWARD_IF_ERROR(cBlockSize, "RLE compress block failed");
+ DEBUGLOG(4, "Writing out RLE block, size: %zu", cBlockSize);
+ } else {
+ U32 cBlockHeader;
+ /* Error checking and repcodes update */
+ ZSTD_confirmRepcodesAndEntropyTables(cctx);
+ if (cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
+ cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
+
+ /* Write block header into beginning of block*/
+ cBlockHeader = lastBlock + (((U32)bt_compressed)<<1) + (U32)(compressedSeqsSize << 3);
+ MEM_writeLE24(op, cBlockHeader);
+ cBlockSize = ZSTD_blockHeaderSize + compressedSeqsSize;
+ DEBUGLOG(4, "Writing out compressed block, size: %zu", cBlockSize);
+ }
+
+ cSize += cBlockSize;
+ DEBUGLOG(4, "cSize running total: %zu", cSize);
+
+ if (lastBlock) {
+ break;
+ } else {
+ ip += blockSize;
+ op += cBlockSize;
+ remaining -= blockSize;
+ dstCapacity -= cBlockSize;
+ cctx->isFirstBlock = 0;
+ }
+ }
+
+ return cSize;
+}
+
+size_t ZSTD_compressSequences(ZSTD_CCtx* const cctx, void* dst, size_t dstCapacity,
+ const ZSTD_Sequence* inSeqs, size_t inSeqsSize,
+ const void* src, size_t srcSize) {
+ BYTE* op = (BYTE*)dst;
+ size_t cSize = 0;
+ size_t compressedBlocksSize = 0;
+ size_t frameHeaderSize = 0;
+
+ /* Transparent initialization stage, same as compressStream2() */
+ DEBUGLOG(3, "ZSTD_compressSequences()");
+ assert(cctx != NULL);
+ FORWARD_IF_ERROR(ZSTD_CCtx_init_compressStream2(cctx, ZSTD_e_end, srcSize), "CCtx initialization failed");
+ /* Begin writing output, starting with frame header */
+ frameHeaderSize = ZSTD_writeFrameHeader(op, dstCapacity, &cctx->appliedParams, srcSize, cctx->dictID);
+ op += frameHeaderSize;
+ dstCapacity -= frameHeaderSize;
+ cSize += frameHeaderSize;
+ if (cctx->appliedParams.fParams.checksumFlag && srcSize) {
+ xxh64_update(&cctx->xxhState, src, srcSize);
+ }
+ /* cSize includes block header size and compressed sequences size */
+ compressedBlocksSize = ZSTD_compressSequences_internal(cctx,
+ op, dstCapacity,
+ inSeqs, inSeqsSize,
+ src, srcSize);
+ FORWARD_IF_ERROR(compressedBlocksSize, "Compressing blocks failed!");
+ cSize += compressedBlocksSize;
+ dstCapacity -= compressedBlocksSize;
+
+ if (cctx->appliedParams.fParams.checksumFlag) {
+ U32 const checksum = (U32) xxh64_digest(&cctx->xxhState);
+ RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for checksum");
+ DEBUGLOG(4, "Write checksum : %08X", (unsigned)checksum);
+ MEM_writeLE32((char*)dst + cSize, checksum);
+ cSize += 4;
+ }
+
+ DEBUGLOG(3, "Final compressed size: %zu", cSize);
+ return cSize;
+}
+
+/*====== 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 };
+ return ZSTD_compressStream2(zcs, output, &input, ZSTD_e_flush);
+}
+
+
+size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
+{
+ ZSTD_inBuffer input = { NULL, 0, 0 };
+ size_t const remainingToFlush = ZSTD_compressStream2(zcs, output, &input, ZSTD_e_end);
+ FORWARD_IF_ERROR( remainingToFlush , "ZSTD_compressStream2 failed");
+ if (zcs->appliedParams.nbWorkers > 0) return remainingToFlush; /* minimal estimation */
+ /* single thread mode : attempt to calculate remaining to flush more precisely */
+ { size_t const lastBlockSize = zcs->frameEnded ? 0 : ZSTD_BLOCKHEADERSIZE;
+ size_t const checksumSize = (size_t)(zcs->frameEnded ? 0 : zcs->appliedParams.fParams.checksumFlag * 4);
+ size_t const toFlush = remainingToFlush + lastBlockSize + checksumSize;
+ DEBUGLOG(4, "ZSTD_endStream : remaining to flush : %u", (unsigned)toFlush);
+ return toFlush;
+ }
+}
+
+
+/*-===== Pre-defined compression levels =====-*/
+
+#define ZSTD_MAX_CLEVEL 22
+int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }
+int ZSTD_minCLevel(void) { return (int)-ZSTD_TARGETLENGTH_MAX; }
+
+static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEVEL+1] = {
+{ /* "default" - for any srcSize > 256 KB */
+ /* W, C, H, S, L, TL, strat */
+ { 19, 12, 13, 1, 6, 1, ZSTD_fast }, /* base for negative levels */
+ { 19, 13, 14, 1, 7, 0, ZSTD_fast }, /* level 1 */
+ { 20, 15, 16, 1, 6, 0, ZSTD_fast }, /* level 2 */
+ { 21, 16, 17, 1, 5, 0, ZSTD_dfast }, /* level 3 */
+ { 21, 18, 18, 1, 5, 0, ZSTD_dfast }, /* level 4 */
+ { 21, 18, 19, 2, 5, 2, ZSTD_greedy }, /* level 5 */
+ { 21, 19, 19, 3, 5, 4, ZSTD_greedy }, /* level 6 */
+ { 21, 19, 19, 3, 5, 8, ZSTD_lazy }, /* level 7 */
+ { 21, 19, 19, 3, 5, 16, ZSTD_lazy2 }, /* level 8 */
+ { 21, 19, 20, 4, 5, 16, ZSTD_lazy2 }, /* level 9 */
+ { 22, 20, 21, 4, 5, 16, ZSTD_lazy2 }, /* level 10 */
+ { 22, 21, 22, 4, 5, 16, ZSTD_lazy2 }, /* level 11 */
+ { 22, 21, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 12 */
+ { 22, 21, 22, 5, 5, 32, ZSTD_btlazy2 }, /* level 13 */
+ { 22, 22, 23, 5, 5, 32, ZSTD_btlazy2 }, /* level 14 */
+ { 22, 23, 23, 6, 5, 32, ZSTD_btlazy2 }, /* level 15 */
+ { 22, 22, 22, 5, 5, 48, ZSTD_btopt }, /* level 16 */
+ { 23, 23, 22, 5, 4, 64, ZSTD_btopt }, /* level 17 */
+ { 23, 23, 22, 6, 3, 64, ZSTD_btultra }, /* level 18 */
+ { 23, 24, 22, 7, 3,256, ZSTD_btultra2}, /* level 19 */
+ { 25, 25, 23, 7, 3,256, ZSTD_btultra2}, /* level 20 */
+ { 26, 26, 24, 7, 3,512, ZSTD_btultra2}, /* level 21 */
+ { 27, 27, 25, 9, 3,999, ZSTD_btultra2}, /* level 22 */
+},
+{ /* for srcSize <= 256 KB */
+ /* W, C, H, S, L, T, strat */
+ { 18, 12, 13, 1, 5, 1, ZSTD_fast }, /* base for negative levels */
+ { 18, 13, 14, 1, 6, 0, ZSTD_fast }, /* level 1 */
+ { 18, 14, 14, 1, 5, 0, ZSTD_dfast }, /* level 2 */
+ { 18, 16, 16, 1, 4, 0, ZSTD_dfast }, /* level 3 */
+ { 18, 16, 17, 2, 5, 2, ZSTD_greedy }, /* level 4.*/
+ { 18, 18, 18, 3, 5, 2, ZSTD_greedy }, /* level 5.*/
+ { 18, 18, 19, 3, 5, 4, ZSTD_lazy }, /* level 6.*/
+ { 18, 18, 19, 4, 4, 4, ZSTD_lazy }, /* level 7 */
+ { 18, 18, 19, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */
+ { 18, 18, 19, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */
+ { 18, 18, 19, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */
+ { 18, 18, 19, 5, 4, 12, ZSTD_btlazy2 }, /* level 11.*/
+ { 18, 19, 19, 7, 4, 12, ZSTD_btlazy2 }, /* level 12.*/
+ { 18, 18, 19, 4, 4, 16, ZSTD_btopt }, /* level 13 */
+ { 18, 18, 19, 4, 3, 32, ZSTD_btopt }, /* level 14.*/
+ { 18, 18, 19, 6, 3,128, ZSTD_btopt }, /* level 15.*/
+ { 18, 19, 19, 6, 3,128, ZSTD_btultra }, /* level 16.*/
+ { 18, 19, 19, 8, 3,256, ZSTD_btultra }, /* level 17.*/
+ { 18, 19, 19, 6, 3,128, ZSTD_btultra2}, /* level 18.*/
+ { 18, 19, 19, 8, 3,256, ZSTD_btultra2}, /* level 19.*/
+ { 18, 19, 19, 10, 3,512, ZSTD_btultra2}, /* level 20.*/
+ { 18, 19, 19, 12, 3,512, ZSTD_btultra2}, /* level 21.*/
+ { 18, 19, 19, 13, 3,999, ZSTD_btultra2}, /* level 22.*/
+},
+{ /* for srcSize <= 128 KB */
+ /* W, C, H, S, L, T, strat */
+ { 17, 12, 12, 1, 5, 1, ZSTD_fast }, /* base for negative levels */
+ { 17, 12, 13, 1, 6, 0, ZSTD_fast }, /* level 1 */
+ { 17, 13, 15, 1, 5, 0, ZSTD_fast }, /* level 2 */
+ { 17, 15, 16, 2, 5, 0, ZSTD_dfast }, /* level 3 */
+ { 17, 17, 17, 2, 4, 0, ZSTD_dfast }, /* level 4 */
+ { 17, 16, 17, 3, 4, 2, ZSTD_greedy }, /* level 5 */
+ { 17, 17, 17, 3, 4, 4, ZSTD_lazy }, /* level 6 */
+ { 17, 17, 17, 3, 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, 5, 4, 8, ZSTD_btlazy2 }, /* level 11 */
+ { 17, 18, 17, 7, 4, 12, ZSTD_btlazy2 }, /* level 12 */
+ { 17, 18, 17, 3, 4, 12, ZSTD_btopt }, /* level 13.*/
+ { 17, 18, 17, 4, 3, 32, ZSTD_btopt }, /* level 14.*/
+ { 17, 18, 17, 6, 3,256, ZSTD_btopt }, /* level 15.*/
+ { 17, 18, 17, 6, 3,128, ZSTD_btultra }, /* level 16.*/
+ { 17, 18, 17, 8, 3,256, ZSTD_btultra }, /* level 17.*/
+ { 17, 18, 17, 10, 3,512, ZSTD_btultra }, /* level 18.*/
+ { 17, 18, 17, 5, 3,256, ZSTD_btultra2}, /* level 19.*/
+ { 17, 18, 17, 7, 3,512, ZSTD_btultra2}, /* level 20.*/
+ { 17, 18, 17, 9, 3,512, ZSTD_btultra2}, /* level 21.*/
+ { 17, 18, 17, 11, 3,999, ZSTD_btultra2}, /* level 22.*/
+},
+{ /* for srcSize <= 16 KB */
+ /* W, C, H, S, L, T, strat */
+ { 14, 12, 13, 1, 5, 1, ZSTD_fast }, /* base for negative levels */
+ { 14, 14, 15, 1, 5, 0, ZSTD_fast }, /* level 1 */
+ { 14, 14, 15, 1, 4, 0, ZSTD_fast }, /* level 2 */
+ { 14, 14, 15, 2, 4, 0, ZSTD_dfast }, /* level 3 */
+ { 14, 14, 14, 4, 4, 2, ZSTD_greedy }, /* level 4 */
+ { 14, 14, 14, 3, 4, 4, ZSTD_lazy }, /* level 5.*/
+ { 14, 14, 14, 4, 4, 8, ZSTD_lazy2 }, /* level 6 */
+ { 14, 14, 14, 6, 4, 8, ZSTD_lazy2 }, /* level 7 */
+ { 14, 14, 14, 8, 4, 8, ZSTD_lazy2 }, /* level 8.*/
+ { 14, 15, 14, 5, 4, 8, ZSTD_btlazy2 }, /* level 9.*/
+ { 14, 15, 14, 9, 4, 8, ZSTD_btlazy2 }, /* level 10.*/
+ { 14, 15, 14, 3, 4, 12, ZSTD_btopt }, /* level 11.*/
+ { 14, 15, 14, 4, 3, 24, ZSTD_btopt }, /* level 12.*/
+ { 14, 15, 14, 5, 3, 32, ZSTD_btultra }, /* level 13.*/
+ { 14, 15, 15, 6, 3, 64, ZSTD_btultra }, /* level 14.*/
+ { 14, 15, 15, 7, 3,256, ZSTD_btultra }, /* level 15.*/
+ { 14, 15, 15, 5, 3, 48, ZSTD_btultra2}, /* level 16.*/
+ { 14, 15, 15, 6, 3,128, ZSTD_btultra2}, /* level 17.*/
+ { 14, 15, 15, 7, 3,256, ZSTD_btultra2}, /* level 18.*/
+ { 14, 15, 15, 8, 3,256, ZSTD_btultra2}, /* level 19.*/
+ { 14, 15, 15, 8, 3,512, ZSTD_btultra2}, /* level 20.*/
+ { 14, 15, 15, 9, 3,512, ZSTD_btultra2}, /* level 21.*/
+ { 14, 15, 15, 10, 3,999, ZSTD_btultra2}, /* level 22.*/
+},
+};
+
+static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(int const compressionLevel, size_t const dictSize)
+{
+ ZSTD_compressionParameters cParams = ZSTD_getCParams_internal(compressionLevel, 0, dictSize, ZSTD_cpm_createCDict);
+ switch (cParams.strategy) {
+ case ZSTD_fast:
+ case ZSTD_dfast:
+ break;
+ case ZSTD_greedy:
+ case ZSTD_lazy:
+ case ZSTD_lazy2:
+ cParams.hashLog += ZSTD_LAZY_DDSS_BUCKET_LOG;
+ break;
+ case ZSTD_btlazy2:
+ case ZSTD_btopt:
+ case ZSTD_btultra:
+ case ZSTD_btultra2:
+ break;
+ }
+ return cParams;
+}
+
+static int ZSTD_dedicatedDictSearch_isSupported(
+ ZSTD_compressionParameters const* cParams)
+{
+ return (cParams->strategy >= ZSTD_greedy)
+ && (cParams->strategy <= ZSTD_lazy2)
+ && (cParams->hashLog >= cParams->chainLog)
+ && (cParams->chainLog <= 24);
+}
+
+/*
+ * Reverses the adjustment applied to cparams when enabling dedicated dict
+ * search. This is used to recover the params set to be used in the working
+ * context. (Otherwise, those tables would also grow.)
+ */
+static void ZSTD_dedicatedDictSearch_revertCParams(
+ ZSTD_compressionParameters* cParams) {
+ switch (cParams->strategy) {
+ case ZSTD_fast:
+ case ZSTD_dfast:
+ break;
+ case ZSTD_greedy:
+ case ZSTD_lazy:
+ case ZSTD_lazy2:
+ cParams->hashLog -= ZSTD_LAZY_DDSS_BUCKET_LOG;
+ break;
+ case ZSTD_btlazy2:
+ case ZSTD_btopt:
+ case ZSTD_btultra:
+ case ZSTD_btultra2:
+ break;
+ }
+}
+
+static U64 ZSTD_getCParamRowSize(U64 srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode)
+{
+ switch (mode) {
+ case ZSTD_cpm_unknown:
+ case ZSTD_cpm_noAttachDict:
+ case ZSTD_cpm_createCDict:
+ break;
+ case ZSTD_cpm_attachDict:
+ dictSize = 0;
+ break;
+ default:
+ assert(0);
+ break;
+ }
+ { int const unknown = srcSizeHint == ZSTD_CONTENTSIZE_UNKNOWN;
+ size_t const addedSize = unknown && dictSize > 0 ? 500 : 0;
+ return unknown && dictSize == 0 ? ZSTD_CONTENTSIZE_UNKNOWN : srcSizeHint+dictSize+addedSize;
+ }
+}
+
+/*! ZSTD_getCParams_internal() :
+ * @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize.
+ * Note: srcSizeHint 0 means 0, use ZSTD_CONTENTSIZE_UNKNOWN for unknown.
+ * Use dictSize == 0 for unknown or unused.
+ * Note: `mode` controls how we treat the `dictSize`. See docs for `ZSTD_cParamMode_e`. */
+static ZSTD_compressionParameters ZSTD_getCParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode)
+{
+ U64 const rSize = ZSTD_getCParamRowSize(srcSizeHint, dictSize, mode);
+ U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB);
+ int row;
+ DEBUGLOG(5, "ZSTD_getCParams_internal (cLevel=%i)", compressionLevel);
+
+ /* row */
+ if (compressionLevel == 0) row = ZSTD_CLEVEL_DEFAULT; /* 0 == default */
+ else if (compressionLevel < 0) row = 0; /* entry 0 is baseline for fast mode */
+ else if (compressionLevel > ZSTD_MAX_CLEVEL) row = ZSTD_MAX_CLEVEL;
+ else row = compressionLevel;
+
+ { ZSTD_compressionParameters cp = ZSTD_defaultCParameters[tableID][row];
+ /* acceleration factor */
+ if (compressionLevel < 0) {
+ int const clampedCompressionLevel = MAX(ZSTD_minCLevel(), compressionLevel);
+ cp.targetLength = (unsigned)(-clampedCompressionLevel);
+ }
+ /* refine parameters based on srcSize & dictSize */
+ return ZSTD_adjustCParams_internal(cp, srcSizeHint, dictSize, mode);
+ }
+}
+
+/*! ZSTD_getCParams() :
+ * @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize.
+ * Size values are optional, provide 0 if not known or unused */
+ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize)
+{
+ if (srcSizeHint == 0) srcSizeHint = ZSTD_CONTENTSIZE_UNKNOWN;
+ return ZSTD_getCParams_internal(compressionLevel, srcSizeHint, dictSize, ZSTD_cpm_unknown);
+}
+
+/*! ZSTD_getParams() :
+ * same idea as ZSTD_getCParams()
+ * @return a `ZSTD_parameters` structure (instead of `ZSTD_compressionParameters`).
+ * Fields of `ZSTD_frameParameters` are set to default values */
+static ZSTD_parameters ZSTD_getParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_cParamMode_e mode) {
+ ZSTD_parameters params;
+ ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, srcSizeHint, dictSize, mode);
+ DEBUGLOG(5, "ZSTD_getParams (cLevel=%i)", compressionLevel);
+ ZSTD_memset(&params, 0, sizeof(params));
+ params.cParams = cParams;
+ params.fParams.contentSizeFlag = 1;
+ return params;
+}
+
+/*! ZSTD_getParams() :
+ * same idea as ZSTD_getCParams()
+ * @return a `ZSTD_parameters` structure (instead of `ZSTD_compressionParameters`).
+ * Fields of `ZSTD_frameParameters` are set to default values */
+ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize) {
+ if (srcSizeHint == 0) srcSizeHint = ZSTD_CONTENTSIZE_UNKNOWN;
+ return ZSTD_getParams_internal(compressionLevel, srcSizeHint, dictSize, ZSTD_cpm_unknown);
+}