209df52ba2
This makes it easier to explain that nbWorkers=0 --> single-threaded mode, while nbWorkers=1 --> asynchronous mode (one mode thread on top of the "main" caller thread). No need for an additional asynchronous mode flag. nbWorkers>=2 works the same as nbThreads>=2 previously.
3388 lines
147 KiB
C
3388 lines
147 KiB
C
/*
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* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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/*-*************************************
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* Tuning parameters
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***************************************/
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#ifndef ZSTD_CLEVEL_DEFAULT
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# define ZSTD_CLEVEL_DEFAULT 3
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#endif
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/*-*************************************
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* Dependencies
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***************************************/
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#include <string.h> /* memset */
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#include "mem.h"
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#define FSE_STATIC_LINKING_ONLY /* FSE_encodeSymbol */
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#include "fse.h"
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#define HUF_STATIC_LINKING_ONLY
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#include "huf.h"
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#include "zstd_compress_internal.h"
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#include "zstd_fast.h"
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#include "zstd_double_fast.h"
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#include "zstd_lazy.h"
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#include "zstd_opt.h"
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#include "zstd_ldm.h"
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/*-*************************************
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* Helper functions
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***************************************/
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size_t ZSTD_compressBound(size_t srcSize) {
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return ZSTD_COMPRESSBOUND(srcSize);
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}
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/*-*************************************
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* Context memory management
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***************************************/
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struct ZSTD_CDict_s {
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void* dictBuffer;
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const void* dictContent;
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size_t dictContentSize;
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void* workspace;
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size_t workspaceSize;
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ZSTD_matchState_t matchState;
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ZSTD_compressedBlockState_t cBlockState;
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ZSTD_compressionParameters cParams;
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ZSTD_customMem customMem;
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U32 dictID;
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}; /* typedef'd to ZSTD_CDict within "zstd.h" */
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ZSTD_CCtx* ZSTD_createCCtx(void)
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{
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return ZSTD_createCCtx_advanced(ZSTD_defaultCMem);
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}
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ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem)
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{
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ZSTD_STATIC_ASSERT(zcss_init==0);
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ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_UNKNOWN==(0ULL - 1));
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if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
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{ ZSTD_CCtx* const cctx = (ZSTD_CCtx*)ZSTD_calloc(sizeof(ZSTD_CCtx), customMem);
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if (!cctx) return NULL;
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cctx->customMem = customMem;
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cctx->requestedParams.compressionLevel = ZSTD_CLEVEL_DEFAULT;
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cctx->requestedParams.fParams.contentSizeFlag = 1;
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return cctx;
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}
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}
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ZSTD_CCtx* ZSTD_initStaticCCtx(void *workspace, size_t workspaceSize)
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{
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ZSTD_CCtx* const cctx = (ZSTD_CCtx*) workspace;
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if (workspaceSize <= sizeof(ZSTD_CCtx)) return NULL; /* minimum size */
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if ((size_t)workspace & 7) return NULL; /* must be 8-aligned */
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memset(workspace, 0, workspaceSize); /* may be a bit generous, could memset be smaller ? */
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cctx->staticSize = workspaceSize;
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cctx->workSpace = (void*)(cctx+1);
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cctx->workSpaceSize = workspaceSize - sizeof(ZSTD_CCtx);
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/* statically sized space. entropyWorkspace never moves (but prev/next block swap places) */
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if (cctx->workSpaceSize < HUF_WORKSPACE_SIZE + 2 * sizeof(ZSTD_compressedBlockState_t)) return NULL;
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assert(((size_t)cctx->workSpace & (sizeof(void*)-1)) == 0); /* ensure correct alignment */
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cctx->blockState.prevCBlock = (ZSTD_compressedBlockState_t*)cctx->workSpace;
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cctx->blockState.nextCBlock = cctx->blockState.prevCBlock + 1;
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{
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void* const ptr = cctx->blockState.nextCBlock + 1;
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cctx->entropyWorkspace = (U32*)ptr;
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}
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return cctx;
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}
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size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx)
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{
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if (cctx==NULL) return 0; /* support free on NULL */
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if (cctx->staticSize) return ERROR(memory_allocation); /* not compatible with static CCtx */
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ZSTD_free(cctx->workSpace, cctx->customMem); cctx->workSpace = NULL;
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ZSTD_freeCDict(cctx->cdictLocal); cctx->cdictLocal = NULL;
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#ifdef ZSTD_MULTITHREAD
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ZSTDMT_freeCCtx(cctx->mtctx); cctx->mtctx = NULL;
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#endif
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ZSTD_free(cctx, cctx->customMem);
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return 0; /* reserved as a potential error code in the future */
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}
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static size_t ZSTD_sizeof_mtctx(const ZSTD_CCtx* cctx)
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{
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#ifdef ZSTD_MULTITHREAD
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return ZSTDMT_sizeof_CCtx(cctx->mtctx);
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#else
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(void) cctx;
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return 0;
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#endif
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}
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size_t ZSTD_sizeof_CCtx(const ZSTD_CCtx* cctx)
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{
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if (cctx==NULL) return 0; /* support sizeof on NULL */
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return sizeof(*cctx) + cctx->workSpaceSize
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+ ZSTD_sizeof_CDict(cctx->cdictLocal)
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+ ZSTD_sizeof_mtctx(cctx);
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}
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size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs)
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{
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return ZSTD_sizeof_CCtx(zcs); /* same object */
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}
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/* private API call, for dictBuilder only */
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const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) { return &(ctx->seqStore); }
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#define ZSTD_CLEVEL_CUSTOM 999
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static ZSTD_compressionParameters ZSTD_getCParamsFromCCtxParams(
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ZSTD_CCtx_params CCtxParams, U64 srcSizeHint, size_t dictSize)
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{
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DEBUGLOG(4, "ZSTD_getCParamsFromCCtxParams: srcSize = %u, dictSize = %u",
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(U32)srcSizeHint, (U32)dictSize);
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return (CCtxParams.compressionLevel == ZSTD_CLEVEL_CUSTOM) ?
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CCtxParams.cParams :
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ZSTD_getCParams(CCtxParams.compressionLevel, srcSizeHint, dictSize);
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}
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static void ZSTD_cLevelToCCtxParams_srcSize(ZSTD_CCtx_params* CCtxParams, U64 srcSize)
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{
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DEBUGLOG(4, "ZSTD_cLevelToCCtxParams_srcSize: srcSize = %u",
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(U32)srcSize);
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CCtxParams->cParams = ZSTD_getCParamsFromCCtxParams(*CCtxParams, srcSize, 0);
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CCtxParams->compressionLevel = ZSTD_CLEVEL_CUSTOM;
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}
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static void ZSTD_cLevelToCParams(ZSTD_CCtx* cctx)
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{
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DEBUGLOG(4, "ZSTD_cLevelToCParams: level=%i", cctx->requestedParams.compressionLevel);
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ZSTD_cLevelToCCtxParams_srcSize(
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&cctx->requestedParams, cctx->pledgedSrcSizePlusOne-1);
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}
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static void ZSTD_cLevelToCCtxParams(ZSTD_CCtx_params* CCtxParams)
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{
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DEBUGLOG(4, "ZSTD_cLevelToCCtxParams");
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ZSTD_cLevelToCCtxParams_srcSize(CCtxParams, ZSTD_CONTENTSIZE_UNKNOWN);
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}
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static ZSTD_CCtx_params ZSTD_makeCCtxParamsFromCParams(
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ZSTD_compressionParameters cParams)
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{
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ZSTD_CCtx_params cctxParams;
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memset(&cctxParams, 0, sizeof(cctxParams));
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cctxParams.cParams = cParams;
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cctxParams.compressionLevel = ZSTD_CLEVEL_CUSTOM;
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return cctxParams;
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}
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static ZSTD_CCtx_params* ZSTD_createCCtxParams_advanced(
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ZSTD_customMem customMem)
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{
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ZSTD_CCtx_params* params;
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if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
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params = (ZSTD_CCtx_params*)ZSTD_calloc(
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sizeof(ZSTD_CCtx_params), customMem);
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if (!params) { return NULL; }
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params->customMem = customMem;
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params->compressionLevel = ZSTD_CLEVEL_DEFAULT;
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return params;
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}
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ZSTD_CCtx_params* ZSTD_createCCtxParams(void)
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{
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return ZSTD_createCCtxParams_advanced(ZSTD_defaultCMem);
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}
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size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params)
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{
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if (params == NULL) { return 0; }
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ZSTD_free(params, params->customMem);
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return 0;
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}
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size_t ZSTD_resetCCtxParams(ZSTD_CCtx_params* params)
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{
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return ZSTD_initCCtxParams(params, ZSTD_CLEVEL_DEFAULT);
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}
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size_t ZSTD_initCCtxParams(ZSTD_CCtx_params* cctxParams, int compressionLevel) {
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if (!cctxParams) { return ERROR(GENERIC); }
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memset(cctxParams, 0, sizeof(*cctxParams));
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cctxParams->compressionLevel = compressionLevel;
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return 0;
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}
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size_t ZSTD_initCCtxParams_advanced(ZSTD_CCtx_params* cctxParams, ZSTD_parameters params)
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{
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if (!cctxParams) { return ERROR(GENERIC); }
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CHECK_F( ZSTD_checkCParams(params.cParams) );
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memset(cctxParams, 0, sizeof(*cctxParams));
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cctxParams->cParams = params.cParams;
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cctxParams->fParams = params.fParams;
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cctxParams->compressionLevel = ZSTD_CLEVEL_CUSTOM;
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return 0;
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}
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static ZSTD_CCtx_params ZSTD_assignParamsToCCtxParams(
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ZSTD_CCtx_params cctxParams, ZSTD_parameters params)
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{
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ZSTD_CCtx_params ret = cctxParams;
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ret.cParams = params.cParams;
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ret.fParams = params.fParams;
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ret.compressionLevel = ZSTD_CLEVEL_CUSTOM;
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return ret;
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}
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#define CLAMPCHECK(val,min,max) { \
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if (((val)<(min)) | ((val)>(max))) { \
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return ERROR(parameter_outOfBound); \
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} }
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size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, unsigned value)
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{
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DEBUGLOG(4, "ZSTD_CCtx_setParameter (%u, %u)", (U32)param, value);
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if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
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switch(param)
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{
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case ZSTD_p_format :
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return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
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case ZSTD_p_compressionLevel:
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if (cctx->cdict) return ERROR(stage_wrong);
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return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
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case ZSTD_p_windowLog:
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case ZSTD_p_hashLog:
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case ZSTD_p_chainLog:
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case ZSTD_p_searchLog:
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case ZSTD_p_minMatch:
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case ZSTD_p_targetLength:
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case ZSTD_p_compressionStrategy:
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if (cctx->cdict) return ERROR(stage_wrong);
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if (value>0) ZSTD_cLevelToCParams(cctx); /* Can optimize if srcSize is known */
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return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
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case ZSTD_p_contentSizeFlag:
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case ZSTD_p_checksumFlag:
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case ZSTD_p_dictIDFlag:
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return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
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case ZSTD_p_forceMaxWindow : /* Force back-references to remain < windowSize,
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* even when referencing into Dictionary content.
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* default : 0 when using a CDict, 1 when using a Prefix */
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return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
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case ZSTD_p_nbWorkers:
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if ((value>0) && cctx->staticSize) {
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return ERROR(parameter_unsupported); /* MT not compatible with static alloc */
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}
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return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
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case ZSTD_p_jobSize:
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case ZSTD_p_overlapSizeLog:
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return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
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case ZSTD_p_enableLongDistanceMatching:
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if (cctx->cdict) return ERROR(stage_wrong);
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if (value>0) ZSTD_cLevelToCParams(cctx);
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return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
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case ZSTD_p_ldmHashLog:
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case ZSTD_p_ldmMinMatch:
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case ZSTD_p_ldmBucketSizeLog:
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case ZSTD_p_ldmHashEveryLog:
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if (cctx->cdict) return ERROR(stage_wrong);
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return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
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default: return ERROR(parameter_unsupported);
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}
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}
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size_t ZSTD_CCtxParam_setParameter(
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ZSTD_CCtx_params* CCtxParams, ZSTD_cParameter param, unsigned value)
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{
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DEBUGLOG(4, "ZSTD_CCtxParam_setParameter (%u, %u)", (U32)param, value);
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switch(param)
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{
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case ZSTD_p_format :
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if (value > (unsigned)ZSTD_f_zstd1_magicless)
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return ERROR(parameter_unsupported);
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CCtxParams->format = (ZSTD_format_e)value;
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return (size_t)CCtxParams->format;
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case ZSTD_p_compressionLevel :
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if ((int)value > ZSTD_maxCLevel()) value = ZSTD_maxCLevel();
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if (value) /* 0 : does not change current level */
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CCtxParams->compressionLevel = value;
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return CCtxParams->compressionLevel;
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case ZSTD_p_windowLog :
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DEBUGLOG(4, "ZSTD_CCtxParam_setParameter: set windowLog=%u", value);
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if (value) { /* 0 : does not change current windowLog */
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CLAMPCHECK(value, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
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ZSTD_cLevelToCCtxParams(CCtxParams);
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CCtxParams->cParams.windowLog = value;
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}
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return CCtxParams->cParams.windowLog;
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case ZSTD_p_hashLog :
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if (value) { /* 0 : does not change current hashLog */
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CLAMPCHECK(value, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
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ZSTD_cLevelToCCtxParams(CCtxParams);
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CCtxParams->cParams.hashLog = value;
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}
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return CCtxParams->cParams.hashLog;
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case ZSTD_p_chainLog :
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if (value) { /* 0 : does not change current chainLog */
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CLAMPCHECK(value, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX);
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ZSTD_cLevelToCCtxParams(CCtxParams);
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CCtxParams->cParams.chainLog = value;
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}
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return CCtxParams->cParams.chainLog;
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case ZSTD_p_searchLog :
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if (value) { /* 0 : does not change current searchLog */
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CLAMPCHECK(value, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
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ZSTD_cLevelToCCtxParams(CCtxParams);
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CCtxParams->cParams.searchLog = value;
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}
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return value;
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case ZSTD_p_minMatch :
|
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if (value) { /* 0 : does not change current minMatch length */
|
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CLAMPCHECK(value, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
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ZSTD_cLevelToCCtxParams(CCtxParams);
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CCtxParams->cParams.searchLength = value;
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}
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return CCtxParams->cParams.searchLength;
|
|
|
|
case ZSTD_p_targetLength :
|
|
if (value) { /* 0 : does not change current sufficient_len */
|
|
CLAMPCHECK(value, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX);
|
|
ZSTD_cLevelToCCtxParams(CCtxParams);
|
|
CCtxParams->cParams.targetLength = value;
|
|
}
|
|
return CCtxParams->cParams.targetLength;
|
|
|
|
case ZSTD_p_compressionStrategy :
|
|
if (value) { /* 0 : does not change currentstrategy */
|
|
CLAMPCHECK(value, (unsigned)ZSTD_fast, (unsigned)ZSTD_btultra);
|
|
ZSTD_cLevelToCCtxParams(CCtxParams);
|
|
CCtxParams->cParams.strategy = (ZSTD_strategy)value;
|
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}
|
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return (size_t)CCtxParams->cParams.strategy;
|
|
|
|
case ZSTD_p_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_p_checksumFlag :
|
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/* A 32-bits content checksum will be calculated and written at end of frame (default:0) */
|
|
CCtxParams->fParams.checksumFlag = value > 0;
|
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return CCtxParams->fParams.checksumFlag;
|
|
|
|
case ZSTD_p_dictIDFlag : /* When applicable, dictionary's dictID is provided in frame header (default:1) */
|
|
DEBUGLOG(4, "set dictIDFlag = %u", (value>0));
|
|
CCtxParams->fParams.noDictIDFlag = (value == 0);
|
|
return !CCtxParams->fParams.noDictIDFlag;
|
|
|
|
case ZSTD_p_forceMaxWindow :
|
|
CCtxParams->forceWindow = (value > 0);
|
|
return CCtxParams->forceWindow;
|
|
|
|
case ZSTD_p_nbWorkers :
|
|
#ifndef ZSTD_MULTITHREAD
|
|
if (value > 0) return ERROR(parameter_unsupported);
|
|
return 0;
|
|
#else
|
|
return ZSTDMT_CCtxParam_setNbWorkers(CCtxParams, value);
|
|
#endif
|
|
|
|
case ZSTD_p_jobSize :
|
|
#ifndef ZSTD_MULTITHREAD
|
|
return ERROR(parameter_unsupported);
|
|
#else
|
|
return ZSTDMT_CCtxParam_setMTCtxParameter(CCtxParams, ZSTDMT_p_jobSize, value);
|
|
#endif
|
|
|
|
case ZSTD_p_overlapSizeLog :
|
|
#ifndef ZSTD_MULTITHREAD
|
|
return ERROR(parameter_unsupported);
|
|
#else
|
|
return ZSTDMT_CCtxParam_setMTCtxParameter(CCtxParams, ZSTDMT_p_overlapSectionLog, value);
|
|
#endif
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|
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case ZSTD_p_enableLongDistanceMatching :
|
|
if (value) {
|
|
ZSTD_cLevelToCCtxParams(CCtxParams);
|
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CCtxParams->cParams.windowLog = ZSTD_LDM_DEFAULT_WINDOW_LOG;
|
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}
|
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return ZSTD_ldm_initializeParameters(&CCtxParams->ldmParams, value);
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|
|
case ZSTD_p_ldmHashLog :
|
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if (value) { /* 0 : does not change current ldmHashLog */
|
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CLAMPCHECK(value, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
|
|
CCtxParams->ldmParams.hashLog = value;
|
|
}
|
|
return CCtxParams->ldmParams.hashLog;
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|
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case ZSTD_p_ldmMinMatch :
|
|
if (value) { /* 0 : does not change current ldmMinMatch */
|
|
CLAMPCHECK(value, ZSTD_LDM_MINMATCH_MIN, ZSTD_LDM_MINMATCH_MAX);
|
|
CCtxParams->ldmParams.minMatchLength = value;
|
|
}
|
|
return CCtxParams->ldmParams.minMatchLength;
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|
|
case ZSTD_p_ldmBucketSizeLog :
|
|
if (value > ZSTD_LDM_BUCKETSIZELOG_MAX) {
|
|
return ERROR(parameter_outOfBound);
|
|
}
|
|
CCtxParams->ldmParams.bucketSizeLog = value;
|
|
return value;
|
|
|
|
case ZSTD_p_ldmHashEveryLog :
|
|
if (value > ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN) {
|
|
return ERROR(parameter_outOfBound);
|
|
}
|
|
CCtxParams->ldmParams.hashEveryLog = value;
|
|
return value;
|
|
|
|
default: return ERROR(parameter_unsupported);
|
|
}
|
|
}
|
|
|
|
/** 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)
|
|
{
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
if (cctx->cdict) return ERROR(stage_wrong);
|
|
|
|
cctx->requestedParams = *params;
|
|
#ifdef ZSTD_MULTITHREAD
|
|
if (cctx->mtctx)
|
|
ZSTDMT_MTCtx_setParametersUsingCCtxParams_whileCompressing(cctx->mtctx, params);
|
|
#endif
|
|
|
|
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);
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
cctx->pledgedSrcSizePlusOne = pledgedSrcSize+1;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_CCtx_loadDictionary_advanced(
|
|
ZSTD_CCtx* cctx, const void* dict, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictMode_e dictMode)
|
|
{
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
if (cctx->staticSize) return ERROR(memory_allocation); /* no malloc for static CCtx */
|
|
DEBUGLOG(4, "ZSTD_CCtx_loadDictionary_advanced (size: %u)", (U32)dictSize);
|
|
ZSTD_freeCDict(cctx->cdictLocal); /* in case one already exists */
|
|
if (dict==NULL || dictSize==0) { /* no dictionary mode */
|
|
cctx->cdictLocal = NULL;
|
|
cctx->cdict = NULL;
|
|
} else {
|
|
ZSTD_compressionParameters const cParams =
|
|
ZSTD_getCParamsFromCCtxParams(cctx->requestedParams, cctx->pledgedSrcSizePlusOne-1, dictSize);
|
|
cctx->cdictLocal = ZSTD_createCDict_advanced(
|
|
dict, dictSize,
|
|
dictLoadMethod, dictMode,
|
|
cParams, cctx->customMem);
|
|
cctx->cdict = cctx->cdictLocal;
|
|
if (cctx->cdictLocal == NULL)
|
|
return ERROR(memory_allocation);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary_byReference(
|
|
ZSTD_CCtx* cctx, const void* dict, size_t dictSize)
|
|
{
|
|
return ZSTD_CCtx_loadDictionary_advanced(
|
|
cctx, dict, dictSize, ZSTD_dlm_byRef, ZSTD_dm_auto);
|
|
}
|
|
|
|
ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, size_t dictSize)
|
|
{
|
|
return ZSTD_CCtx_loadDictionary_advanced(
|
|
cctx, dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dm_auto);
|
|
}
|
|
|
|
|
|
size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
|
|
{
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
cctx->cdict = cdict;
|
|
memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); /* exclusive */
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize)
|
|
{
|
|
return ZSTD_CCtx_refPrefix_advanced(cctx, prefix, prefixSize, ZSTD_dm_rawContent);
|
|
}
|
|
|
|
size_t ZSTD_CCtx_refPrefix_advanced(
|
|
ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize, ZSTD_dictMode_e dictMode)
|
|
{
|
|
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
|
|
cctx->cdict = NULL; /* prefix discards any prior cdict */
|
|
cctx->prefixDict.dict = prefix;
|
|
cctx->prefixDict.dictSize = prefixSize;
|
|
cctx->prefixDict.dictMode = dictMode;
|
|
return 0;
|
|
}
|
|
|
|
static void ZSTD_startNewCompression(ZSTD_CCtx* cctx)
|
|
{
|
|
cctx->streamStage = zcss_init;
|
|
cctx->pledgedSrcSizePlusOne = 0;
|
|
}
|
|
|
|
/*! ZSTD_CCtx_reset() :
|
|
* Also dumps dictionary */
|
|
void ZSTD_CCtx_reset(ZSTD_CCtx* cctx)
|
|
{
|
|
ZSTD_startNewCompression(cctx);
|
|
cctx->cdict = NULL;
|
|
}
|
|
|
|
/** ZSTD_checkCParams() :
|
|
control CParam values remain within authorized range.
|
|
@return : 0, or an error code if one value is beyond authorized range */
|
|
size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams)
|
|
{
|
|
CLAMPCHECK(cParams.windowLog, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
|
|
CLAMPCHECK(cParams.chainLog, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX);
|
|
CLAMPCHECK(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
|
|
CLAMPCHECK(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
|
|
CLAMPCHECK(cParams.searchLength, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
|
|
CLAMPCHECK(cParams.targetLength, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX);
|
|
if ((U32)(cParams.strategy) > (U32)ZSTD_btultra)
|
|
return ERROR(parameter_unsupported);
|
|
return 0;
|
|
}
|
|
|
|
/** ZSTD_clampCParams() :
|
|
* make CParam values within valid range.
|
|
* @return : valid CParams */
|
|
static ZSTD_compressionParameters ZSTD_clampCParams(ZSTD_compressionParameters cParams)
|
|
{
|
|
# define CLAMP(val,min,max) { \
|
|
if (val<min) val=min; \
|
|
else if (val>max) val=max; \
|
|
}
|
|
CLAMP(cParams.windowLog, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
|
|
CLAMP(cParams.chainLog, ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX);
|
|
CLAMP(cParams.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
|
|
CLAMP(cParams.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
|
|
CLAMP(cParams.searchLength, ZSTD_SEARCHLENGTH_MIN, ZSTD_SEARCHLENGTH_MAX);
|
|
CLAMP(cParams.targetLength, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX);
|
|
if ((U32)(cParams.strategy) > (U32)ZSTD_btultra) cParams.strategy = ZSTD_btultra;
|
|
return cParams;
|
|
}
|
|
|
|
/** ZSTD_cycleLog() :
|
|
* condition for correct operation : hashLog > 1 */
|
|
static U32 ZSTD_cycleLog(U32 hashLog, ZSTD_strategy strat)
|
|
{
|
|
U32 const btScale = ((U32)strat >= (U32)ZSTD_btlazy2);
|
|
return hashLog - btScale;
|
|
}
|
|
|
|
/** ZSTD_adjustCParams_internal() :
|
|
optimize `cPar` for a given input (`srcSize` and `dictSize`).
|
|
mostly downsizing to reduce memory consumption and initialization latency.
|
|
Both `srcSize` and `dictSize` are optional (use 0 if unknown).
|
|
Note : cPar is considered validated at this stage. Use ZSTD_checkCParams() to ensure that condition. */
|
|
ZSTD_compressionParameters ZSTD_adjustCParams_internal(ZSTD_compressionParameters cPar, unsigned long long srcSize, size_t dictSize)
|
|
{
|
|
static const U64 minSrcSize = 513; /* (1<<9) + 1 */
|
|
static const U64 maxWindowResize = 1ULL << (ZSTD_WINDOWLOG_MAX-1);
|
|
assert(ZSTD_checkCParams(cPar)==0);
|
|
|
|
if (dictSize && (srcSize+1<2) /* srcSize unknown */ )
|
|
srcSize = minSrcSize; /* presumed small when there is a dictionary */
|
|
else if (srcSize == 0)
|
|
srcSize = ZSTD_CONTENTSIZE_UNKNOWN; /* 0 == unknown : presumed large */
|
|
|
|
/* resize windowLog if input is small enough, to use less memory */
|
|
if ( (srcSize < maxWindowResize)
|
|
&& (dictSize < maxWindowResize) ) {
|
|
U32 const tSize = (U32)(srcSize + dictSize);
|
|
static U32 const hashSizeMin = 1 << ZSTD_HASHLOG_MIN;
|
|
U32 const srcLog = (tSize < hashSizeMin) ? ZSTD_HASHLOG_MIN :
|
|
ZSTD_highbit32(tSize-1) + 1;
|
|
if (cPar.windowLog > srcLog) cPar.windowLog = srcLog;
|
|
}
|
|
if (cPar.hashLog > cPar.windowLog) cPar.hashLog = cPar.windowLog;
|
|
{ U32 const cycleLog = ZSTD_cycleLog(cPar.chainLog, cPar.strategy);
|
|
if (cycleLog > cPar.windowLog)
|
|
cPar.chainLog -= (cycleLog - cPar.windowLog);
|
|
}
|
|
|
|
if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN)
|
|
cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* required for frame header */
|
|
|
|
return cPar;
|
|
}
|
|
|
|
ZSTD_compressionParameters ZSTD_adjustCParams(ZSTD_compressionParameters cPar, unsigned long long srcSize, size_t dictSize)
|
|
{
|
|
cPar = ZSTD_clampCParams(cPar);
|
|
return ZSTD_adjustCParams_internal(cPar, srcSize, dictSize);
|
|
}
|
|
|
|
static size_t ZSTD_sizeof_matchState(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->searchLength==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
|
|
size_t const h3Size = ((size_t)1) << hashLog3;
|
|
size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
|
|
size_t const optPotentialSpace = ((MaxML+1) + (MaxLL+1) + (MaxOff+1) + (1<<Litbits)) * sizeof(U32)
|
|
+ (ZSTD_OPT_NUM+1) * (sizeof(ZSTD_match_t)+sizeof(ZSTD_optimal_t));
|
|
size_t const optSpace = (forCCtx && ((cParams->strategy == ZSTD_btopt) ||
|
|
(cParams->strategy == ZSTD_btultra)))
|
|
? optPotentialSpace
|
|
: 0;
|
|
DEBUGLOG(4, "chainSize: %u - hSize: %u - h3Size: %u",
|
|
(U32)chainSize, (U32)hSize, (U32)h3Size);
|
|
return tableSpace + optSpace;
|
|
}
|
|
|
|
size_t ZSTD_estimateCCtxSize_usingCCtxParams(const ZSTD_CCtx_params* params)
|
|
{
|
|
/* Estimate CCtx size is supported for single-threaded compression only. */
|
|
if (params->nbWorkers > 0) { return ERROR(GENERIC); }
|
|
{ ZSTD_compressionParameters const cParams =
|
|
ZSTD_getCParamsFromCCtxParams(*params, 0, 0);
|
|
size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << cParams.windowLog);
|
|
U32 const divider = (cParams.searchLength==3) ? 3 : 4;
|
|
size_t const maxNbSeq = blockSize / divider;
|
|
size_t const tokenSpace = blockSize + 11*maxNbSeq;
|
|
size_t const entropySpace = HUF_WORKSPACE_SIZE;
|
|
size_t const blockStateSpace = 2 * sizeof(ZSTD_compressedBlockState_t);
|
|
size_t const matchStateSize = ZSTD_sizeof_matchState(¶ms->cParams, /* forCCtx */ 1);
|
|
|
|
size_t const ldmSpace = params->ldmParams.enableLdm ?
|
|
ZSTD_ldm_getTableSize(params->ldmParams.hashLog,
|
|
params->ldmParams.bucketSizeLog) : 0;
|
|
|
|
size_t const neededSpace = entropySpace + blockStateSpace + tokenSpace +
|
|
matchStateSize + ldmSpace;
|
|
|
|
DEBUGLOG(5, "sizeof(ZSTD_CCtx) : %u", (U32)sizeof(ZSTD_CCtx));
|
|
DEBUGLOG(5, "estimate workSpace : %u", (U32)neededSpace);
|
|
return sizeof(ZSTD_CCtx) + neededSpace;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_estimateCCtxSize_usingCParams(ZSTD_compressionParameters cParams)
|
|
{
|
|
ZSTD_CCtx_params const params = ZSTD_makeCCtxParamsFromCParams(cParams);
|
|
return ZSTD_estimateCCtxSize_usingCCtxParams(¶ms);
|
|
}
|
|
|
|
static size_t ZSTD_estimateCCtxSize_internal(int compressionLevel)
|
|
{
|
|
ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, 0, 0);
|
|
return ZSTD_estimateCCtxSize_usingCParams(cParams);
|
|
}
|
|
|
|
size_t ZSTD_estimateCCtxSize(int compressionLevel)
|
|
{
|
|
int level;
|
|
size_t memBudget = 0;
|
|
for (level=1; level<=compressionLevel; level++) {
|
|
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)
|
|
{
|
|
if (params->nbWorkers > 0) { return ERROR(GENERIC); }
|
|
{ size_t const CCtxSize = ZSTD_estimateCCtxSize_usingCCtxParams(params);
|
|
size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << params->cParams.windowLog);
|
|
size_t const inBuffSize = ((size_t)1 << params->cParams.windowLog) + blockSize;
|
|
size_t const outBuffSize = ZSTD_compressBound(blockSize) + 1;
|
|
size_t const streamingSize = inBuffSize + outBuffSize;
|
|
|
|
return CCtxSize + streamingSize;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_estimateCStreamSize_usingCParams(ZSTD_compressionParameters cParams)
|
|
{
|
|
ZSTD_CCtx_params const params = ZSTD_makeCCtxParamsFromCParams(cParams);
|
|
return ZSTD_estimateCStreamSize_usingCCtxParams(¶ms);
|
|
}
|
|
|
|
static size_t ZSTD_estimateCStreamSize_internal(int compressionLevel) {
|
|
ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, 0, 0);
|
|
return ZSTD_estimateCStreamSize_usingCParams(cParams);
|
|
}
|
|
|
|
size_t ZSTD_estimateCStreamSize(int compressionLevel) {
|
|
int level;
|
|
size_t memBudget = 0;
|
|
for (level=1; level<=compressionLevel; level++) {
|
|
size_t const newMB = ZSTD_estimateCStreamSize_internal(level);
|
|
if (newMB > memBudget) memBudget = newMB;
|
|
}
|
|
return memBudget;
|
|
}
|
|
|
|
/* ZSTD_getFrameProgression():
|
|
* tells how much data has been consumed (input) and produced (output) for current frame.
|
|
* able to count progression inside worker threads (non-blocking mode).
|
|
*/
|
|
ZSTD_frameProgression ZSTD_getFrameProgression(const ZSTD_CCtx* cctx)
|
|
{
|
|
#ifdef ZSTD_MULTITHREAD
|
|
if (cctx->appliedParams.nbWorkers > 0) {
|
|
return ZSTDMT_getFrameProgression(cctx->mtctx);
|
|
}
|
|
#endif
|
|
{ ZSTD_frameProgression fp;
|
|
size_t const buffered = (cctx->inBuff == NULL) ? 0 :
|
|
cctx->inBuffPos - cctx->inToCompress;
|
|
if (buffered) assert(cctx->inBuffPos >= cctx->inToCompress);
|
|
assert(buffered <= ZSTD_BLOCKSIZE_MAX);
|
|
fp.ingested = cctx->consumedSrcSize + buffered;
|
|
fp.consumed = cctx->consumedSrcSize;
|
|
fp.produced = cctx->producedCSize;
|
|
return fp;
|
|
} }
|
|
|
|
|
|
static U32 ZSTD_equivalentCParams(ZSTD_compressionParameters cParams1,
|
|
ZSTD_compressionParameters cParams2)
|
|
{
|
|
return (cParams1.hashLog == cParams2.hashLog)
|
|
& (cParams1.chainLog == cParams2.chainLog)
|
|
& (cParams1.strategy == cParams2.strategy) /* opt parser space */
|
|
& ((cParams1.searchLength==3) == (cParams2.searchLength==3)); /* hashlog3 space */
|
|
}
|
|
|
|
/** The parameters are equivalent if ldm is not enabled in both sets or
|
|
* all the parameters are equivalent. */
|
|
static U32 ZSTD_equivalentLdmParams(ldmParams_t ldmParams1,
|
|
ldmParams_t ldmParams2)
|
|
{
|
|
return (!ldmParams1.enableLdm && !ldmParams2.enableLdm) ||
|
|
(ldmParams1.enableLdm == ldmParams2.enableLdm &&
|
|
ldmParams1.hashLog == ldmParams2.hashLog &&
|
|
ldmParams1.bucketSizeLog == ldmParams2.bucketSizeLog &&
|
|
ldmParams1.minMatchLength == ldmParams2.minMatchLength &&
|
|
ldmParams1.hashEveryLog == ldmParams2.hashEveryLog);
|
|
}
|
|
|
|
typedef enum { ZSTDb_not_buffered, ZSTDb_buffered } ZSTD_buffered_policy_e;
|
|
|
|
/* ZSTD_sufficientBuff() :
|
|
* check internal buffers exist for streaming if buffPol == ZSTDb_buffered .
|
|
* Note : they are assumed to be correctly sized if ZSTD_equivalentCParams()==1 */
|
|
static U32 ZSTD_sufficientBuff(size_t bufferSize1, size_t blockSize1,
|
|
ZSTD_buffered_policy_e buffPol2,
|
|
ZSTD_compressionParameters cParams2,
|
|
U64 pledgedSrcSize)
|
|
{
|
|
size_t const windowSize2 = MAX(1, (size_t)MIN(((U64)1 << cParams2.windowLog), pledgedSrcSize));
|
|
size_t const blockSize2 = MIN(ZSTD_BLOCKSIZE_MAX, windowSize2);
|
|
size_t const neededBufferSize2 = (buffPol2==ZSTDb_buffered) ? windowSize2 + blockSize2 : 0;
|
|
DEBUGLOG(4, "ZSTD_sufficientBuff: is windowSize2=%u <= wlog1=%u",
|
|
(U32)windowSize2, cParams2.windowLog);
|
|
DEBUGLOG(4, "ZSTD_sufficientBuff: is blockSize2=%u <= blockSize1=%u",
|
|
(U32)blockSize2, (U32)blockSize1);
|
|
return (blockSize2 <= blockSize1) /* seqStore space depends on blockSize */
|
|
& (neededBufferSize2 <= bufferSize1);
|
|
}
|
|
|
|
/** Equivalence for resetCCtx purposes */
|
|
static U32 ZSTD_equivalentParams(ZSTD_CCtx_params params1,
|
|
ZSTD_CCtx_params params2,
|
|
size_t buffSize1, size_t blockSize1,
|
|
ZSTD_buffered_policy_e buffPol2,
|
|
U64 pledgedSrcSize)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_equivalentParams: pledgedSrcSize=%u", (U32)pledgedSrcSize);
|
|
return ZSTD_equivalentCParams(params1.cParams, params2.cParams) &&
|
|
ZSTD_equivalentLdmParams(params1.ldmParams, params2.ldmParams) &&
|
|
ZSTD_sufficientBuff(buffSize1, blockSize1, buffPol2, params2.cParams, pledgedSrcSize);
|
|
}
|
|
|
|
static 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.hufCTable_repeatMode = HUF_repeat_none;
|
|
bs->entropy.offcode_repeatMode = FSE_repeat_none;
|
|
bs->entropy.matchlength_repeatMode = FSE_repeat_none;
|
|
bs->entropy.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)
|
|
{
|
|
size_t const endT = (size_t)(ms->nextSrc - ms->base);
|
|
U32 const end = (U32)endT;
|
|
assert(endT < (3U<<30));
|
|
|
|
ms->lowLimit = end;
|
|
ms->dictLimit = end;
|
|
ms->nextToUpdate = end + 1;
|
|
ms->loadedDictEnd = 0;
|
|
ms->opt.litLengthSum = 0; /* force reset of btopt stats */
|
|
}
|
|
|
|
/*! ZSTD_continueCCtx() :
|
|
* reuse CCtx without reset (note : requires no dictionary) */
|
|
static size_t ZSTD_continueCCtx(ZSTD_CCtx* cctx, ZSTD_CCtx_params params, U64 pledgedSrcSize)
|
|
{
|
|
size_t const windowSize = MAX(1, (size_t)MIN(((U64)1 << params.cParams.windowLog), pledgedSrcSize));
|
|
size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, windowSize);
|
|
DEBUGLOG(4, "ZSTD_continueCCtx: re-use context in place");
|
|
|
|
cctx->blockSize = blockSize; /* previous block size could be different even for same windowLog, due to pledgedSrcSize */
|
|
cctx->appliedParams = params;
|
|
cctx->pledgedSrcSizePlusOne = pledgedSrcSize+1;
|
|
cctx->consumedSrcSize = 0;
|
|
cctx->producedCSize = 0;
|
|
if (pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN)
|
|
cctx->appliedParams.fParams.contentSizeFlag = 0;
|
|
DEBUGLOG(4, "pledged content size : %u ; flag : %u",
|
|
(U32)pledgedSrcSize, cctx->appliedParams.fParams.contentSizeFlag);
|
|
cctx->stage = ZSTDcs_init;
|
|
cctx->dictID = 0;
|
|
ZSTD_invalidateMatchState(&cctx->blockState.matchState);
|
|
ZSTD_reset_compressedBlockState(cctx->blockState.prevCBlock);
|
|
XXH64_reset(&cctx->xxhState, 0);
|
|
return 0;
|
|
}
|
|
|
|
typedef enum { ZSTDcrp_continue, ZSTDcrp_noMemset } ZSTD_compResetPolicy_e;
|
|
|
|
static void* ZSTD_reset_matchState(ZSTD_matchState_t* ms, void* ptr, ZSTD_compressionParameters const* cParams, ZSTD_compResetPolicy_e const crp, U32 const 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->searchLength==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
|
|
size_t const h3Size = ((size_t)1) << hashLog3;
|
|
size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
|
|
|
|
assert(((size_t)ptr & 3) == 0);
|
|
|
|
ms->nextSrc = NULL;
|
|
ms->base = NULL;
|
|
ms->dictBase = NULL;
|
|
ms->hashLog3 = hashLog3;
|
|
ZSTD_invalidateMatchState(ms);
|
|
|
|
/* opt parser space */
|
|
if (forCCtx && ((cParams->strategy == ZSTD_btopt) | (cParams->strategy == ZSTD_btultra))) {
|
|
DEBUGLOG(4, "reserving optimal parser space");
|
|
ms->opt.litFreq = (U32*)ptr;
|
|
ms->opt.litLengthFreq = ms->opt.litFreq + (1<<Litbits);
|
|
ms->opt.matchLengthFreq = ms->opt.litLengthFreq + (MaxLL+1);
|
|
ms->opt.offCodeFreq = ms->opt.matchLengthFreq + (MaxML+1);
|
|
ptr = ms->opt.offCodeFreq + (MaxOff+1);
|
|
ms->opt.matchTable = (ZSTD_match_t*)ptr;
|
|
ptr = ms->opt.matchTable + ZSTD_OPT_NUM+1;
|
|
ms->opt.priceTable = (ZSTD_optimal_t*)ptr;
|
|
ptr = ms->opt.priceTable + ZSTD_OPT_NUM+1;
|
|
}
|
|
|
|
/* table Space */
|
|
DEBUGLOG(4, "reset table : %u", crp!=ZSTDcrp_noMemset);
|
|
assert(((size_t)ptr & 3) == 0); /* ensure ptr is properly aligned */
|
|
if (crp!=ZSTDcrp_noMemset) memset(ptr, 0, tableSpace); /* reset tables only */
|
|
ms->hashTable = (U32*)(ptr);
|
|
ms->chainTable = ms->hashTable + hSize;
|
|
ms->hashTable3 = ms->chainTable + chainSize;
|
|
ptr = ms->hashTable3 + h3Size;
|
|
|
|
assert(((size_t)ptr & 3) == 0);
|
|
return ptr;
|
|
}
|
|
|
|
/*! ZSTD_resetCCtx_internal() :
|
|
note : `params` are assumed fully validated at this stage */
|
|
static size_t ZSTD_resetCCtx_internal(ZSTD_CCtx* zc,
|
|
ZSTD_CCtx_params params, U64 pledgedSrcSize,
|
|
ZSTD_compResetPolicy_e const crp,
|
|
ZSTD_buffered_policy_e const zbuff)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_resetCCtx_internal: pledgedSrcSize=%u, wlog=%u",
|
|
(U32)pledgedSrcSize, params.cParams.windowLog);
|
|
assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
|
|
|
|
if (crp == ZSTDcrp_continue) {
|
|
if (ZSTD_equivalentParams(zc->appliedParams, params,
|
|
zc->inBuffSize, zc->blockSize,
|
|
zbuff, pledgedSrcSize)) {
|
|
DEBUGLOG(4, "ZSTD_equivalentParams()==1 -> continue mode (wLog1=%u, blockSize1=%u)",
|
|
zc->appliedParams.cParams.windowLog, (U32)zc->blockSize);
|
|
assert(!(params.ldmParams.enableLdm &&
|
|
params.ldmParams.hashEveryLog == ZSTD_LDM_HASHEVERYLOG_NOTSET));
|
|
return ZSTD_continueCCtx(zc, params, pledgedSrcSize);
|
|
} }
|
|
DEBUGLOG(4, "ZSTD_equivalentParams()==0 -> reset CCtx");
|
|
|
|
if (params.ldmParams.enableLdm) {
|
|
/* Adjust long distance matching parameters */
|
|
ZSTD_ldm_adjustParameters(¶ms.ldmParams, params.cParams.windowLog);
|
|
assert(params.ldmParams.hashLog >= params.ldmParams.bucketSizeLog);
|
|
assert(params.ldmParams.hashEveryLog < 32);
|
|
zc->ldmState.hashPower =
|
|
ZSTD_ldm_getHashPower(params.ldmParams.minMatchLength);
|
|
}
|
|
|
|
{ size_t const 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.searchLength==3) ? 3 : 4;
|
|
size_t const maxNbSeq = blockSize / divider;
|
|
size_t const tokenSpace = blockSize + 11*maxNbSeq;
|
|
size_t const buffOutSize = (zbuff==ZSTDb_buffered) ? ZSTD_compressBound(blockSize)+1 : 0;
|
|
size_t const buffInSize = (zbuff==ZSTDb_buffered) ? windowSize + blockSize : 0;
|
|
size_t const matchStateSize = ZSTD_sizeof_matchState(¶ms.cParams, /* forCCtx */ 1);
|
|
void* ptr;
|
|
|
|
/* Check if workSpace is large enough, alloc a new one if needed */
|
|
{ size_t const entropySpace = HUF_WORKSPACE_SIZE;
|
|
size_t const blockStateSpace = 2 * sizeof(ZSTD_compressedBlockState_t);
|
|
size_t const bufferSpace = buffInSize + buffOutSize;
|
|
size_t const ldmSpace = params.ldmParams.enableLdm
|
|
? ZSTD_ldm_getTableSize(params.ldmParams.hashLog, params.ldmParams.bucketSizeLog)
|
|
: 0;
|
|
size_t const neededSpace = entropySpace + blockStateSpace + ldmSpace +
|
|
matchStateSize + tokenSpace + bufferSpace;
|
|
DEBUGLOG(4, "Need %uKB workspace, including %uKB for match state, and %uKB for buffers",
|
|
(U32)(neededSpace>>10), (U32)(matchStateSize>>10), (U32)(bufferSpace>>10));
|
|
DEBUGLOG(4, "windowSize: %u - blockSize: %u", (U32)windowSize, (U32)blockSize);
|
|
|
|
if (zc->workSpaceSize < neededSpace) { /* too small : resize */
|
|
DEBUGLOG(4, "Need to update workSpaceSize from %uK to %uK",
|
|
(unsigned)(zc->workSpaceSize>>10),
|
|
(unsigned)(neededSpace>>10));
|
|
/* static cctx : no resize, error out */
|
|
if (zc->staticSize) return ERROR(memory_allocation);
|
|
|
|
zc->workSpaceSize = 0;
|
|
ZSTD_free(zc->workSpace, zc->customMem);
|
|
zc->workSpace = ZSTD_malloc(neededSpace, zc->customMem);
|
|
if (zc->workSpace == NULL) return ERROR(memory_allocation);
|
|
zc->workSpaceSize = neededSpace;
|
|
ptr = zc->workSpace;
|
|
|
|
/* Statically sized space. entropyWorkspace never moves (but prev/next block swap places) */
|
|
assert(((size_t)zc->workSpace & 3) == 0); /* ensure correct alignment */
|
|
assert(zc->workSpaceSize >= 2 * sizeof(ZSTD_compressedBlockState_t));
|
|
zc->blockState.prevCBlock = (ZSTD_compressedBlockState_t*)zc->workSpace;
|
|
zc->blockState.nextCBlock = zc->blockState.prevCBlock + 1;
|
|
ptr = zc->blockState.nextCBlock + 1;
|
|
zc->entropyWorkspace = (U32*)ptr;
|
|
} }
|
|
|
|
/* init params */
|
|
zc->appliedParams = params;
|
|
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",
|
|
(U32)pledgedSrcSize, zc->appliedParams.fParams.contentSizeFlag);
|
|
zc->blockSize = blockSize;
|
|
|
|
XXH64_reset(&zc->xxhState, 0);
|
|
zc->stage = ZSTDcs_init;
|
|
zc->dictID = 0;
|
|
|
|
ZSTD_reset_compressedBlockState(zc->blockState.prevCBlock);
|
|
|
|
ptr = zc->entropyWorkspace + HUF_WORKSPACE_SIZE_U32;
|
|
|
|
/* ldm hash table */
|
|
/* initialize bucketOffsets table later for pointer alignment */
|
|
if (params.ldmParams.enableLdm) {
|
|
size_t const ldmHSize = ((size_t)1) << params.ldmParams.hashLog;
|
|
memset(ptr, 0, ldmHSize * sizeof(ldmEntry_t));
|
|
assert(((size_t)ptr & 3) == 0); /* ensure ptr is properly aligned */
|
|
zc->ldmState.hashTable = (ldmEntry_t*)ptr;
|
|
ptr = zc->ldmState.hashTable + ldmHSize;
|
|
}
|
|
|
|
ptr = ZSTD_reset_matchState(&zc->blockState.matchState, ptr, ¶ms.cParams, crp, /* forCCtx */ 1);
|
|
|
|
/* sequences storage */
|
|
zc->seqStore.sequencesStart = (seqDef*)ptr;
|
|
ptr = zc->seqStore.sequencesStart + maxNbSeq;
|
|
zc->seqStore.llCode = (BYTE*) ptr;
|
|
zc->seqStore.mlCode = zc->seqStore.llCode + maxNbSeq;
|
|
zc->seqStore.ofCode = zc->seqStore.mlCode + maxNbSeq;
|
|
zc->seqStore.litStart = zc->seqStore.ofCode + maxNbSeq;
|
|
ptr = zc->seqStore.litStart + blockSize;
|
|
|
|
/* ldm bucketOffsets table */
|
|
if (params.ldmParams.enableLdm) {
|
|
size_t const ldmBucketSize =
|
|
((size_t)1) << (params.ldmParams.hashLog -
|
|
params.ldmParams.bucketSizeLog);
|
|
memset(ptr, 0, ldmBucketSize);
|
|
zc->ldmState.bucketOffsets = (BYTE*)ptr;
|
|
ptr = zc->ldmState.bucketOffsets + ldmBucketSize;
|
|
}
|
|
|
|
/* buffers */
|
|
zc->inBuffSize = buffInSize;
|
|
zc->inBuff = (char*)ptr;
|
|
zc->outBuffSize = buffOutSize;
|
|
zc->outBuff = zc->inBuff + buffInSize;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* ZSTD_invalidateRepCodes() :
|
|
* ensures next compression will not use repcodes from previous block.
|
|
* Note : only works with regular variant;
|
|
* do not use with extDict variant ! */
|
|
void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx) {
|
|
int i;
|
|
for (i=0; i<ZSTD_REP_NUM; i++) cctx->blockState.prevCBlock->rep[i] = 0;
|
|
assert(/* !extDict */ cctx->blockState.matchState.lowLimit == cctx->blockState.matchState.dictLimit);
|
|
}
|
|
|
|
static size_t ZSTD_resetCCtx_usingCDict(ZSTD_CCtx* cctx,
|
|
const ZSTD_CDict* cdict,
|
|
unsigned windowLog,
|
|
ZSTD_frameParameters fParams,
|
|
U64 pledgedSrcSize,
|
|
ZSTD_buffered_policy_e zbuff)
|
|
{
|
|
{ ZSTD_CCtx_params params = cctx->requestedParams;
|
|
/* Copy only compression parameters related to tables. */
|
|
params.cParams = cdict->cParams;
|
|
if (windowLog) params.cParams.windowLog = windowLog;
|
|
params.fParams = fParams;
|
|
ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
|
|
ZSTDcrp_noMemset, 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);
|
|
}
|
|
|
|
/* 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;
|
|
size_t const tableSpace = (chainSize + hSize) * sizeof(U32);
|
|
assert((U32*)cctx->blockState.matchState.chainTable == (U32*)cctx->blockState.matchState.hashTable + hSize); /* chainTable must follow hashTable */
|
|
assert((U32*)cctx->blockState.matchState.hashTable3 == (U32*)cctx->blockState.matchState.chainTable + chainSize);
|
|
assert((U32*)cdict->matchState.chainTable == (U32*)cdict->matchState.hashTable + hSize); /* chainTable must follow hashTable */
|
|
assert((U32*)cdict->matchState.hashTable3 == (U32*)cdict->matchState.chainTable + chainSize);
|
|
memcpy(cctx->blockState.matchState.hashTable, cdict->matchState.hashTable, tableSpace); /* presumes all tables follow each other */
|
|
}
|
|
/* Zero the hashTable3, since the cdict never fills it */
|
|
{ size_t const h3Size = (size_t)1 << cctx->blockState.matchState.hashLog3;
|
|
assert(cdict->matchState.hashLog3 == 0);
|
|
memset(cctx->blockState.matchState.hashTable3, 0, h3Size * sizeof(U32));
|
|
}
|
|
|
|
/* copy dictionary offsets */
|
|
{
|
|
ZSTD_matchState_t const* srcMatchState = &cdict->matchState;
|
|
ZSTD_matchState_t* dstMatchState = &cctx->blockState.matchState;
|
|
dstMatchState->nextToUpdate = srcMatchState->nextToUpdate;
|
|
dstMatchState->nextToUpdate3= srcMatchState->nextToUpdate3;
|
|
dstMatchState->nextSrc = srcMatchState->nextSrc;
|
|
dstMatchState->base = srcMatchState->base;
|
|
dstMatchState->dictBase = srcMatchState->dictBase;
|
|
dstMatchState->dictLimit = srcMatchState->dictLimit;
|
|
dstMatchState->lowLimit = srcMatchState->lowLimit;
|
|
dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd;
|
|
}
|
|
cctx->dictID = cdict->dictID;
|
|
|
|
/* copy block state */
|
|
memcpy(cctx->blockState.prevCBlock, &cdict->cBlockState, sizeof(cdict->cBlockState));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*! 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");
|
|
if (srcCCtx->stage!=ZSTDcs_init) return ERROR(stage_wrong);
|
|
|
|
memcpy(&dstCCtx->customMem, &srcCCtx->customMem, sizeof(ZSTD_customMem));
|
|
{ ZSTD_CCtx_params params = dstCCtx->requestedParams;
|
|
/* Copy only compression parameters related to tables. */
|
|
params.cParams = srcCCtx->appliedParams.cParams;
|
|
params.fParams = fParams;
|
|
ZSTD_resetCCtx_internal(dstCCtx, params, pledgedSrcSize,
|
|
ZSTDcrp_noMemset, zbuff);
|
|
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);
|
|
}
|
|
|
|
/* copy tables */
|
|
{ size_t const chainSize = (srcCCtx->appliedParams.cParams.strategy == ZSTD_fast) ? 0 : ((size_t)1 << srcCCtx->appliedParams.cParams.chainLog);
|
|
size_t const hSize = (size_t)1 << srcCCtx->appliedParams.cParams.hashLog;
|
|
size_t const h3Size = (size_t)1 << srcCCtx->blockState.matchState.hashLog3;
|
|
size_t const tableSpace = (chainSize + hSize + h3Size) * sizeof(U32);
|
|
assert((U32*)dstCCtx->blockState.matchState.chainTable == (U32*)dstCCtx->blockState.matchState.hashTable + hSize); /* chainTable must follow hashTable */
|
|
assert((U32*)dstCCtx->blockState.matchState.hashTable3 == (U32*)dstCCtx->blockState.matchState.chainTable + chainSize);
|
|
memcpy(dstCCtx->blockState.matchState.hashTable, srcCCtx->blockState.matchState.hashTable, tableSpace); /* presumes all tables follow each other */
|
|
}
|
|
|
|
/* copy dictionary offsets */
|
|
{
|
|
ZSTD_matchState_t const* srcMatchState = &srcCCtx->blockState.matchState;
|
|
ZSTD_matchState_t* dstMatchState = &dstCCtx->blockState.matchState;
|
|
dstMatchState->nextToUpdate = srcMatchState->nextToUpdate;
|
|
dstMatchState->nextToUpdate3= srcMatchState->nextToUpdate3;
|
|
dstMatchState->nextSrc = srcMatchState->nextSrc;
|
|
dstMatchState->base = srcMatchState->base;
|
|
dstMatchState->dictBase = srcMatchState->dictBase;
|
|
dstMatchState->dictLimit = srcMatchState->dictLimit;
|
|
dstMatchState->lowLimit = srcMatchState->lowLimit;
|
|
dstMatchState->loadedDictEnd= srcMatchState->loadedDictEnd;
|
|
}
|
|
dstCCtx->dictID = srcCCtx->dictID;
|
|
|
|
/* copy block state */
|
|
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 = (ZSTD_buffered_policy_e)(srcCCtx->inBuffSize>0);
|
|
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_internal() :
|
|
* reduce table indexes by `reducerValue`
|
|
* presume table size is a multiple of ZSTD_ROWSIZE.
|
|
* Helps auto-vectorization */
|
|
static void ZSTD_reduceTable_internal (U32* const table, int const nbRows, U32 const reducerValue)
|
|
{
|
|
int cellNb = 0;
|
|
int rowNb;
|
|
for (rowNb=0 ; rowNb < nbRows ; rowNb++) {
|
|
int column;
|
|
for (column=0; column<ZSTD_ROWSIZE; column++) {
|
|
if (table[cellNb] < reducerValue) table[cellNb] = 0;
|
|
else table[cellNb] -= reducerValue;
|
|
cellNb++;
|
|
} }
|
|
}
|
|
|
|
/*! ZSTD_reduceTable() :
|
|
* reduce table indexes by `reducerValue` */
|
|
static void ZSTD_reduceTable (U32* const table, U32 const size, U32 const reducerValue)
|
|
{
|
|
assert((size & (ZSTD_ROWSIZE-1)) == 0); /* multiple of ZSTD_ROWSIZE */
|
|
assert(size < (1U<<31)); /* can be casted to int */
|
|
ZSTD_reduceTable_internal(table, size/ZSTD_ROWSIZE, reducerValue);
|
|
}
|
|
|
|
/*! ZSTD_ldm_reduceTable() :
|
|
* reduce table indexes by `reducerValue` */
|
|
static void ZSTD_ldm_reduceTable(ldmEntry_t* const table, U32 const size,
|
|
U32 const reducerValue)
|
|
{
|
|
U32 u;
|
|
for (u = 0; u < size; u++) {
|
|
if (table[u].offset < reducerValue) table[u].offset = 0;
|
|
else table[u].offset -= reducerValue;
|
|
}
|
|
}
|
|
|
|
/*! ZSTD_reduceIndex() :
|
|
* rescale all indexes to avoid future overflow (indexes are U32) */
|
|
static void ZSTD_reduceIndex (ZSTD_CCtx* zc, const U32 reducerValue)
|
|
{
|
|
ZSTD_matchState_t* const ms = &zc->blockState.matchState;
|
|
{ U32 const hSize = (U32)1 << zc->appliedParams.cParams.hashLog;
|
|
ZSTD_reduceTable(ms->hashTable, hSize, reducerValue);
|
|
}
|
|
|
|
if (zc->appliedParams.cParams.strategy != ZSTD_fast) {
|
|
U32 const chainSize = (U32)1 << zc->appliedParams.cParams.chainLog;
|
|
if (zc->appliedParams.cParams.strategy == ZSTD_btlazy2)
|
|
ZSTD_preserveUnsortedMark(ms->chainTable, chainSize, reducerValue);
|
|
ZSTD_reduceTable(ms->chainTable, chainSize, reducerValue);
|
|
}
|
|
|
|
if (ms->hashLog3) {
|
|
U32 const h3Size = (U32)1 << ms->hashLog3;
|
|
ZSTD_reduceTable(ms->hashTable3, h3Size, reducerValue);
|
|
}
|
|
|
|
if (zc->appliedParams.ldmParams.enableLdm) {
|
|
U32 const ldmHSize = (U32)1 << zc->appliedParams.ldmParams.hashLog;
|
|
ZSTD_ldm_reduceTable(zc->ldmState.hashTable, ldmHSize, reducerValue);
|
|
}
|
|
}
|
|
|
|
|
|
/*-*******************************************************
|
|
* Block entropic compression
|
|
*********************************************************/
|
|
|
|
/* See doc/zstd_compression_format.md for detailed format description */
|
|
|
|
size_t ZSTD_noCompressBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
if (srcSize + ZSTD_blockHeaderSize > dstCapacity) return ERROR(dstSize_tooSmall);
|
|
memcpy((BYTE*)dst + ZSTD_blockHeaderSize, src, srcSize);
|
|
MEM_writeLE24(dst, (U32)(srcSize << 2) + (U32)bt_raw);
|
|
return ZSTD_blockHeaderSize+srcSize;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_noCompressLiterals (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
BYTE* const ostart = (BYTE* const)dst;
|
|
U32 const flSize = 1 + (srcSize>31) + (srcSize>4095);
|
|
|
|
if (srcSize + flSize > dstCapacity) return ERROR(dstSize_tooSmall);
|
|
|
|
switch(flSize)
|
|
{
|
|
case 1: /* 2 - 1 - 5 */
|
|
ostart[0] = (BYTE)((U32)set_basic + (srcSize<<3));
|
|
break;
|
|
case 2: /* 2 - 2 - 12 */
|
|
MEM_writeLE16(ostart, (U16)((U32)set_basic + (1<<2) + (srcSize<<4)));
|
|
break;
|
|
case 3: /* 2 - 2 - 20 */
|
|
MEM_writeLE32(ostart, (U32)((U32)set_basic + (3<<2) + (srcSize<<4)));
|
|
break;
|
|
default: /* not necessary : flSize is {1,2,3} */
|
|
assert(0);
|
|
}
|
|
|
|
memcpy(ostart + flSize, src, srcSize);
|
|
return srcSize + flSize;
|
|
}
|
|
|
|
static size_t ZSTD_compressRleLiteralsBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
BYTE* const ostart = (BYTE* const)dst;
|
|
U32 const flSize = 1 + (srcSize>31) + (srcSize>4095);
|
|
|
|
(void)dstCapacity; /* dstCapacity already guaranteed to be >=4, hence large enough */
|
|
|
|
switch(flSize)
|
|
{
|
|
case 1: /* 2 - 1 - 5 */
|
|
ostart[0] = (BYTE)((U32)set_rle + (srcSize<<3));
|
|
break;
|
|
case 2: /* 2 - 2 - 12 */
|
|
MEM_writeLE16(ostart, (U16)((U32)set_rle + (1<<2) + (srcSize<<4)));
|
|
break;
|
|
case 3: /* 2 - 2 - 20 */
|
|
MEM_writeLE32(ostart, (U32)((U32)set_rle + (3<<2) + (srcSize<<4)));
|
|
break;
|
|
default: /* not necessary : flSize is {1,2,3} */
|
|
assert(0);
|
|
}
|
|
|
|
ostart[flSize] = *(const BYTE*)src;
|
|
return flSize+1;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_minGain(size_t srcSize) { return (srcSize >> 6) + 2; }
|
|
|
|
static size_t ZSTD_compressLiterals (ZSTD_entropyCTables_t const* prevEntropy,
|
|
ZSTD_entropyCTables_t* nextEntropy,
|
|
ZSTD_strategy strategy,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
U32* workspace)
|
|
{
|
|
size_t const minGain = ZSTD_minGain(srcSize);
|
|
size_t const lhSize = 3 + (srcSize >= 1 KB) + (srcSize >= 16 KB);
|
|
BYTE* const ostart = (BYTE*)dst;
|
|
U32 singleStream = srcSize < 256;
|
|
symbolEncodingType_e hType = set_compressed;
|
|
size_t cLitSize;
|
|
|
|
/* Prepare nextEntropy assuming reusing the existing table */
|
|
nextEntropy->hufCTable_repeatMode = prevEntropy->hufCTable_repeatMode;
|
|
memcpy(nextEntropy->hufCTable, prevEntropy->hufCTable,
|
|
sizeof(prevEntropy->hufCTable));
|
|
|
|
/* small ? don't even attempt compression (speed opt) */
|
|
# define LITERAL_NOENTROPY 63
|
|
{ size_t const minLitSize = prevEntropy->hufCTable_repeatMode == HUF_repeat_valid ? 6 : LITERAL_NOENTROPY;
|
|
if (srcSize <= minLitSize) return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
|
|
}
|
|
|
|
if (dstCapacity < lhSize+1) return ERROR(dstSize_tooSmall); /* not enough space for compression */
|
|
{ HUF_repeat repeat = prevEntropy->hufCTable_repeatMode;
|
|
int const preferRepeat = strategy < ZSTD_lazy ? srcSize <= 1024 : 0;
|
|
if (repeat == HUF_repeat_valid && lhSize == 3) singleStream = 1;
|
|
cLitSize = singleStream ? HUF_compress1X_repeat(ostart+lhSize, dstCapacity-lhSize, src, srcSize, 255, 11,
|
|
workspace, HUF_WORKSPACE_SIZE, (HUF_CElt*)nextEntropy->hufCTable, &repeat, preferRepeat)
|
|
: HUF_compress4X_repeat(ostart+lhSize, dstCapacity-lhSize, src, srcSize, 255, 11,
|
|
workspace, HUF_WORKSPACE_SIZE, (HUF_CElt*)nextEntropy->hufCTable, &repeat, preferRepeat);
|
|
if (repeat != HUF_repeat_none) {
|
|
/* reused the existing table */
|
|
hType = set_repeat;
|
|
}
|
|
}
|
|
|
|
if ((cLitSize==0) | (cLitSize >= srcSize - minGain) | ERR_isError(cLitSize)) {
|
|
memcpy(nextEntropy->hufCTable, prevEntropy->hufCTable, sizeof(prevEntropy->hufCTable));
|
|
return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
|
|
}
|
|
if (cLitSize==1) {
|
|
memcpy(nextEntropy->hufCTable, prevEntropy->hufCTable, sizeof(prevEntropy->hufCTable));
|
|
return ZSTD_compressRleLiteralsBlock(dst, dstCapacity, src, srcSize);
|
|
}
|
|
|
|
if (hType == set_compressed) {
|
|
/* using a newly constructed table */
|
|
nextEntropy->hufCTable_repeatMode = HUF_repeat_check;
|
|
}
|
|
|
|
/* Build header */
|
|
switch(lhSize)
|
|
{
|
|
case 3: /* 2 - 2 - 10 - 10 */
|
|
{ U32 const lhc = hType + ((!singleStream) << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<14);
|
|
MEM_writeLE24(ostart, lhc);
|
|
break;
|
|
}
|
|
case 4: /* 2 - 2 - 14 - 14 */
|
|
{ U32 const lhc = hType + (2 << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<18);
|
|
MEM_writeLE32(ostart, lhc);
|
|
break;
|
|
}
|
|
case 5: /* 2 - 2 - 18 - 18 */
|
|
{ U32 const lhc = hType + (3 << 2) + ((U32)srcSize<<4) + ((U32)cLitSize<<22);
|
|
MEM_writeLE32(ostart, lhc);
|
|
ostart[4] = (BYTE)(cLitSize >> 10);
|
|
break;
|
|
}
|
|
default: /* not possible : lhSize is {3,4,5} */
|
|
assert(0);
|
|
}
|
|
return lhSize+cLitSize;
|
|
}
|
|
|
|
|
|
void ZSTD_seqToCodes(const seqStore_t* seqStorePtr)
|
|
{
|
|
const seqDef* const sequences = seqStorePtr->sequencesStart;
|
|
BYTE* const llCodeTable = seqStorePtr->llCode;
|
|
BYTE* const ofCodeTable = seqStorePtr->ofCode;
|
|
BYTE* const mlCodeTable = seqStorePtr->mlCode;
|
|
U32 const nbSeq = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
|
|
U32 u;
|
|
for (u=0; u<nbSeq; u++) {
|
|
U32 const llv = sequences[u].litLength;
|
|
U32 const mlv = sequences[u].matchLength;
|
|
llCodeTable[u] = (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;
|
|
}
|
|
|
|
typedef enum {
|
|
ZSTD_defaultDisallowed = 0,
|
|
ZSTD_defaultAllowed = 1
|
|
} ZSTD_defaultPolicy_e;
|
|
|
|
MEM_STATIC
|
|
symbolEncodingType_e ZSTD_selectEncodingType(
|
|
FSE_repeat* repeatMode, size_t const mostFrequent, size_t nbSeq,
|
|
U32 defaultNormLog, ZSTD_defaultPolicy_e const isDefaultAllowed)
|
|
{
|
|
#define MIN_SEQ_FOR_DYNAMIC_FSE 64
|
|
#define MAX_SEQ_FOR_STATIC_FSE 1000
|
|
ZSTD_STATIC_ASSERT(ZSTD_defaultDisallowed == 0 && ZSTD_defaultAllowed != 0);
|
|
if ((mostFrequent == nbSeq) && (!isDefaultAllowed || nbSeq > 2)) {
|
|
DEBUGLOG(5, "Selected set_rle");
|
|
/* Prefer set_basic over set_rle when there are 2 or less symbols,
|
|
* since RLE uses 1 byte, but set_basic uses 5-6 bits per symbol.
|
|
* If basic encoding isn't possible, always choose RLE.
|
|
*/
|
|
*repeatMode = FSE_repeat_check;
|
|
return set_rle;
|
|
}
|
|
if ( isDefaultAllowed
|
|
&& (*repeatMode == FSE_repeat_valid) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) {
|
|
DEBUGLOG(5, "Selected set_repeat");
|
|
return set_repeat;
|
|
}
|
|
if ( isDefaultAllowed
|
|
&& ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (defaultNormLog-1)))) ) {
|
|
DEBUGLOG(5, "Selected set_basic");
|
|
/* The format allows default tables to be repeated, but it isn't useful.
|
|
* When using simple heuristics to select encoding type, we don't want
|
|
* to confuse these tables with dictionaries. When running more careful
|
|
* analysis, we don't need to waste time checking both repeating tables
|
|
* and default tables.
|
|
*/
|
|
*repeatMode = FSE_repeat_none;
|
|
return set_basic;
|
|
}
|
|
DEBUGLOG(5, "Selected set_compressed");
|
|
*repeatMode = FSE_repeat_check;
|
|
return set_compressed;
|
|
}
|
|
|
|
MEM_STATIC
|
|
size_t ZSTD_buildCTable(void* dst, size_t dstCapacity,
|
|
FSE_CTable* nextCTable, U32 FSELog, symbolEncodingType_e type,
|
|
U32* count, U32 max,
|
|
BYTE const* codeTable, size_t nbSeq,
|
|
S16 const* defaultNorm, U32 defaultNormLog, U32 defaultMax,
|
|
FSE_CTable const* prevCTable, size_t prevCTableSize,
|
|
void* workspace, size_t workspaceSize)
|
|
{
|
|
BYTE* op = (BYTE*)dst;
|
|
BYTE const* const oend = op + dstCapacity;
|
|
|
|
switch (type) {
|
|
case set_rle:
|
|
*op = codeTable[0];
|
|
CHECK_F(FSE_buildCTable_rle(nextCTable, (BYTE)max));
|
|
return 1;
|
|
case set_repeat:
|
|
memcpy(nextCTable, prevCTable, prevCTableSize);
|
|
return 0;
|
|
case set_basic:
|
|
CHECK_F(FSE_buildCTable_wksp(nextCTable, defaultNorm, defaultMax, defaultNormLog, workspace, workspaceSize)); /* note : could be pre-calculated */
|
|
return 0;
|
|
case set_compressed: {
|
|
S16 norm[MaxSeq + 1];
|
|
size_t nbSeq_1 = nbSeq;
|
|
const U32 tableLog = FSE_optimalTableLog(FSELog, nbSeq, max);
|
|
if (count[codeTable[nbSeq-1]] > 1) {
|
|
count[codeTable[nbSeq-1]]--;
|
|
nbSeq_1--;
|
|
}
|
|
assert(nbSeq_1 > 1);
|
|
CHECK_F(FSE_normalizeCount(norm, tableLog, count, nbSeq_1, max));
|
|
{ size_t const NCountSize = FSE_writeNCount(op, oend - op, norm, max, tableLog); /* overflow protected */
|
|
if (FSE_isError(NCountSize)) return NCountSize;
|
|
CHECK_F(FSE_buildCTable_wksp(nextCTable, norm, max, tableLog, workspace, workspaceSize));
|
|
return NCountSize;
|
|
}
|
|
}
|
|
default: return assert(0), ERROR(GENERIC);
|
|
}
|
|
}
|
|
|
|
MEM_STATIC
|
|
size_t ZSTD_encodeSequences(
|
|
void* dst, size_t dstCapacity,
|
|
FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
|
|
FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
|
|
FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
|
|
seqDef const* sequences, size_t nbSeq, int longOffsets)
|
|
{
|
|
BIT_CStream_t blockStream;
|
|
FSE_CState_t stateMatchLength;
|
|
FSE_CState_t stateOffsetBits;
|
|
FSE_CState_t stateLitLength;
|
|
|
|
CHECK_E(BIT_initCStream(&blockStream, dst, dstCapacity), dstSize_tooSmall); /* not enough space remaining */
|
|
|
|
/* first symbols */
|
|
FSE_initCState2(&stateMatchLength, CTable_MatchLength, mlCodeTable[nbSeq-1]);
|
|
FSE_initCState2(&stateOffsetBits, CTable_OffsetBits, ofCodeTable[nbSeq-1]);
|
|
FSE_initCState2(&stateLitLength, CTable_LitLength, llCodeTable[nbSeq-1]);
|
|
BIT_addBits(&blockStream, sequences[nbSeq-1].litLength, LL_bits[llCodeTable[nbSeq-1]]);
|
|
if (MEM_32bits()) BIT_flushBits(&blockStream);
|
|
BIT_addBits(&blockStream, sequences[nbSeq-1].matchLength, ML_bits[mlCodeTable[nbSeq-1]]);
|
|
if (MEM_32bits()) BIT_flushBits(&blockStream);
|
|
if (longOffsets) {
|
|
U32 const ofBits = ofCodeTable[nbSeq-1];
|
|
int const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1);
|
|
if (extraBits) {
|
|
BIT_addBits(&blockStream, sequences[nbSeq-1].offset, extraBits);
|
|
BIT_flushBits(&blockStream);
|
|
}
|
|
BIT_addBits(&blockStream, sequences[nbSeq-1].offset >> extraBits,
|
|
ofBits - extraBits);
|
|
} else {
|
|
BIT_addBits(&blockStream, sequences[nbSeq-1].offset, ofCodeTable[nbSeq-1]);
|
|
}
|
|
BIT_flushBits(&blockStream);
|
|
|
|
{ size_t n;
|
|
for (n=nbSeq-2 ; n<nbSeq ; n--) { /* intentional underflow */
|
|
BYTE const llCode = llCodeTable[n];
|
|
BYTE const ofCode = ofCodeTable[n];
|
|
BYTE const mlCode = mlCodeTable[n];
|
|
U32 const llBits = LL_bits[llCode];
|
|
U32 const ofBits = ofCode;
|
|
U32 const mlBits = ML_bits[mlCode];
|
|
DEBUGLOG(6, "encoding: litlen:%2u - matchlen:%2u - offCode:%7u",
|
|
sequences[n].litLength,
|
|
sequences[n].matchLength + MINMATCH,
|
|
sequences[n].offset); /* 32b*/ /* 64b*/
|
|
/* (7)*/ /* (7)*/
|
|
FSE_encodeSymbol(&blockStream, &stateOffsetBits, ofCode); /* 15 */ /* 15 */
|
|
FSE_encodeSymbol(&blockStream, &stateMatchLength, mlCode); /* 24 */ /* 24 */
|
|
if (MEM_32bits()) BIT_flushBits(&blockStream); /* (7)*/
|
|
FSE_encodeSymbol(&blockStream, &stateLitLength, llCode); /* 16 */ /* 33 */
|
|
if (MEM_32bits() || (ofBits+mlBits+llBits >= 64-7-(LLFSELog+MLFSELog+OffFSELog)))
|
|
BIT_flushBits(&blockStream); /* (7)*/
|
|
BIT_addBits(&blockStream, sequences[n].litLength, llBits);
|
|
if (MEM_32bits() && ((llBits+mlBits)>24)) BIT_flushBits(&blockStream);
|
|
BIT_addBits(&blockStream, sequences[n].matchLength, mlBits);
|
|
if (MEM_32bits() || (ofBits+mlBits+llBits > 56)) BIT_flushBits(&blockStream);
|
|
if (longOffsets) {
|
|
int const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN-1);
|
|
if (extraBits) {
|
|
BIT_addBits(&blockStream, sequences[n].offset, extraBits);
|
|
BIT_flushBits(&blockStream); /* (7)*/
|
|
}
|
|
BIT_addBits(&blockStream, sequences[n].offset >> extraBits,
|
|
ofBits - extraBits); /* 31 */
|
|
} else {
|
|
BIT_addBits(&blockStream, sequences[n].offset, ofBits); /* 31 */
|
|
}
|
|
BIT_flushBits(&blockStream); /* (7)*/
|
|
} }
|
|
|
|
FSE_flushCState(&blockStream, &stateMatchLength);
|
|
FSE_flushCState(&blockStream, &stateOffsetBits);
|
|
FSE_flushCState(&blockStream, &stateLitLength);
|
|
|
|
{ size_t const streamSize = BIT_closeCStream(&blockStream);
|
|
if (streamSize==0) return ERROR(dstSize_tooSmall); /* not enough space */
|
|
return streamSize;
|
|
}
|
|
}
|
|
|
|
MEM_STATIC size_t ZSTD_compressSequences_internal(seqStore_t* seqStorePtr,
|
|
ZSTD_entropyCTables_t const* prevEntropy,
|
|
ZSTD_entropyCTables_t* nextEntropy,
|
|
ZSTD_compressionParameters const* cParams,
|
|
void* dst, size_t dstCapacity, U32* workspace)
|
|
{
|
|
const int longOffsets = cParams->windowLog > STREAM_ACCUMULATOR_MIN;
|
|
U32 count[MaxSeq+1];
|
|
FSE_CTable* CTable_LitLength = nextEntropy->litlengthCTable;
|
|
FSE_CTable* CTable_OffsetBits = nextEntropy->offcodeCTable;
|
|
FSE_CTable* CTable_MatchLength = nextEntropy->matchlengthCTable;
|
|
U32 LLtype, Offtype, MLtype; /* compressed, raw or rle */
|
|
const seqDef* const sequences = seqStorePtr->sequencesStart;
|
|
const BYTE* const ofCodeTable = seqStorePtr->ofCode;
|
|
const BYTE* const llCodeTable = seqStorePtr->llCode;
|
|
const BYTE* const mlCodeTable = seqStorePtr->mlCode;
|
|
BYTE* const ostart = (BYTE*)dst;
|
|
BYTE* const oend = ostart + dstCapacity;
|
|
BYTE* op = ostart;
|
|
size_t const nbSeq = seqStorePtr->sequences - seqStorePtr->sequencesStart;
|
|
BYTE* seqHead;
|
|
|
|
ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<<MAX(MLFSELog,LLFSELog)));
|
|
|
|
/* Compress literals */
|
|
{ const BYTE* const literals = seqStorePtr->litStart;
|
|
size_t const litSize = seqStorePtr->lit - literals;
|
|
size_t const cSize = ZSTD_compressLiterals(prevEntropy, nextEntropy,
|
|
cParams->strategy, op, dstCapacity, literals, litSize,
|
|
workspace);
|
|
if (ZSTD_isError(cSize))
|
|
return cSize;
|
|
assert(cSize <= dstCapacity);
|
|
op += cSize;
|
|
}
|
|
|
|
/* Sequences Header */
|
|
if ((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead*/) return ERROR(dstSize_tooSmall);
|
|
if (nbSeq < 0x7F)
|
|
*op++ = (BYTE)nbSeq;
|
|
else if (nbSeq < LONGNBSEQ)
|
|
op[0] = (BYTE)((nbSeq>>8) + 0x80), op[1] = (BYTE)nbSeq, op+=2;
|
|
else
|
|
op[0]=0xFF, MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ)), op+=3;
|
|
if (nbSeq==0) {
|
|
memcpy(nextEntropy->litlengthCTable, prevEntropy->litlengthCTable, sizeof(prevEntropy->litlengthCTable));
|
|
nextEntropy->litlength_repeatMode = prevEntropy->litlength_repeatMode;
|
|
memcpy(nextEntropy->offcodeCTable, prevEntropy->offcodeCTable, sizeof(prevEntropy->offcodeCTable));
|
|
nextEntropy->offcode_repeatMode = prevEntropy->offcode_repeatMode;
|
|
memcpy(nextEntropy->matchlengthCTable, prevEntropy->matchlengthCTable, sizeof(prevEntropy->matchlengthCTable));
|
|
nextEntropy->matchlength_repeatMode = prevEntropy->matchlength_repeatMode;
|
|
return op - ostart;
|
|
}
|
|
|
|
/* seqHead : flags for FSE encoding type */
|
|
seqHead = op++;
|
|
|
|
/* convert length/distances into codes */
|
|
ZSTD_seqToCodes(seqStorePtr);
|
|
/* build CTable for Literal Lengths */
|
|
{ U32 max = MaxLL;
|
|
size_t const mostFrequent = FSE_countFast_wksp(count, &max, llCodeTable, nbSeq, workspace);
|
|
DEBUGLOG(5, "Building LL table");
|
|
nextEntropy->litlength_repeatMode = prevEntropy->litlength_repeatMode;
|
|
LLtype = ZSTD_selectEncodingType(&nextEntropy->litlength_repeatMode, mostFrequent, nbSeq, LL_defaultNormLog, ZSTD_defaultAllowed);
|
|
{ size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_LitLength, LLFSELog, (symbolEncodingType_e)LLtype,
|
|
count, max, llCodeTable, nbSeq, LL_defaultNorm, LL_defaultNormLog, MaxLL,
|
|
prevEntropy->litlengthCTable, sizeof(prevEntropy->litlengthCTable),
|
|
workspace, HUF_WORKSPACE_SIZE);
|
|
if (ZSTD_isError(countSize)) return countSize;
|
|
op += countSize;
|
|
} }
|
|
/* build CTable for Offsets */
|
|
{ U32 max = MaxOff;
|
|
size_t const mostFrequent = FSE_countFast_wksp(count, &max, ofCodeTable, nbSeq, workspace);
|
|
/* We can only use the basic table if max <= DefaultMaxOff, otherwise the offsets are too large */
|
|
ZSTD_defaultPolicy_e const defaultPolicy = (max <= DefaultMaxOff) ? ZSTD_defaultAllowed : ZSTD_defaultDisallowed;
|
|
DEBUGLOG(5, "Building OF table");
|
|
nextEntropy->offcode_repeatMode = prevEntropy->offcode_repeatMode;
|
|
Offtype = ZSTD_selectEncodingType(&nextEntropy->offcode_repeatMode, mostFrequent, nbSeq, OF_defaultNormLog, defaultPolicy);
|
|
{ size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_OffsetBits, OffFSELog, (symbolEncodingType_e)Offtype,
|
|
count, max, ofCodeTable, nbSeq, OF_defaultNorm, OF_defaultNormLog, DefaultMaxOff,
|
|
prevEntropy->offcodeCTable, sizeof(prevEntropy->offcodeCTable),
|
|
workspace, HUF_WORKSPACE_SIZE);
|
|
if (ZSTD_isError(countSize)) return countSize;
|
|
op += countSize;
|
|
} }
|
|
/* build CTable for MatchLengths */
|
|
{ U32 max = MaxML;
|
|
size_t const mostFrequent = FSE_countFast_wksp(count, &max, mlCodeTable, nbSeq, workspace);
|
|
DEBUGLOG(5, "Building ML table");
|
|
nextEntropy->matchlength_repeatMode = prevEntropy->matchlength_repeatMode;
|
|
MLtype = ZSTD_selectEncodingType(&nextEntropy->matchlength_repeatMode, mostFrequent, nbSeq, ML_defaultNormLog, ZSTD_defaultAllowed);
|
|
{ size_t const countSize = ZSTD_buildCTable(op, oend - op, CTable_MatchLength, MLFSELog, (symbolEncodingType_e)MLtype,
|
|
count, max, mlCodeTable, nbSeq, ML_defaultNorm, ML_defaultNormLog, MaxML,
|
|
prevEntropy->matchlengthCTable, sizeof(prevEntropy->matchlengthCTable),
|
|
workspace, HUF_WORKSPACE_SIZE);
|
|
if (ZSTD_isError(countSize)) return countSize;
|
|
op += countSize;
|
|
} }
|
|
|
|
*seqHead = (BYTE)((LLtype<<6) + (Offtype<<4) + (MLtype<<2));
|
|
|
|
{ size_t const bitstreamSize = ZSTD_encodeSequences(
|
|
op, oend - op,
|
|
CTable_MatchLength, mlCodeTable,
|
|
CTable_OffsetBits, ofCodeTable,
|
|
CTable_LitLength, llCodeTable,
|
|
sequences, nbSeq,
|
|
longOffsets);
|
|
if (ZSTD_isError(bitstreamSize)) return bitstreamSize;
|
|
op += bitstreamSize;
|
|
}
|
|
|
|
return op - ostart;
|
|
}
|
|
|
|
MEM_STATIC size_t ZSTD_compressSequences(seqStore_t* seqStorePtr,
|
|
ZSTD_entropyCTables_t const* prevEntropy,
|
|
ZSTD_entropyCTables_t* nextEntropy,
|
|
ZSTD_compressionParameters const* cParams,
|
|
void* dst, size_t dstCapacity,
|
|
size_t srcSize, U32* workspace)
|
|
{
|
|
size_t const cSize = ZSTD_compressSequences_internal(
|
|
seqStorePtr, prevEntropy, nextEntropy, cParams, dst, dstCapacity,
|
|
workspace);
|
|
/* If the srcSize <= dstCapacity, then there is enough space to write a
|
|
* raw uncompressed block. Since we ran out of space, the block must not
|
|
* be compressible, so fall back to a raw uncompressed block.
|
|
*/
|
|
int const uncompressibleError = (cSize == ERROR(dstSize_tooSmall)) && (srcSize <= dstCapacity);
|
|
if (ZSTD_isError(cSize) && !uncompressibleError)
|
|
return cSize;
|
|
|
|
/* Check compressibility */
|
|
{ size_t const minGain = ZSTD_minGain(srcSize); /* note : fixed formula, maybe should depend on compression level, or strategy */
|
|
size_t const maxCSize = srcSize - minGain;
|
|
if (cSize >= maxCSize || uncompressibleError) {
|
|
return 0; /* block not compressed */
|
|
} }
|
|
assert(!ZSTD_isError(cSize));
|
|
|
|
/* 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 (nextEntropy->offcode_repeatMode == FSE_repeat_valid)
|
|
nextEntropy->offcode_repeatMode = FSE_repeat_check;
|
|
|
|
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, int extDict)
|
|
{
|
|
static const ZSTD_blockCompressor blockCompressor[2][(unsigned)ZSTD_btultra+1] = {
|
|
{ ZSTD_compressBlock_fast /* default for 0 */,
|
|
ZSTD_compressBlock_fast, ZSTD_compressBlock_doubleFast, ZSTD_compressBlock_greedy,
|
|
ZSTD_compressBlock_lazy, ZSTD_compressBlock_lazy2, ZSTD_compressBlock_btlazy2,
|
|
ZSTD_compressBlock_btopt, ZSTD_compressBlock_btultra },
|
|
{ ZSTD_compressBlock_fast_extDict /* default for 0 */,
|
|
ZSTD_compressBlock_fast_extDict, ZSTD_compressBlock_doubleFast_extDict, ZSTD_compressBlock_greedy_extDict,
|
|
ZSTD_compressBlock_lazy_extDict,ZSTD_compressBlock_lazy2_extDict, ZSTD_compressBlock_btlazy2_extDict,
|
|
ZSTD_compressBlock_btopt_extDict, ZSTD_compressBlock_btultra_extDict }
|
|
};
|
|
ZSTD_STATIC_ASSERT((unsigned)ZSTD_fast == 1);
|
|
|
|
assert((U32)strat >= (U32)ZSTD_fast);
|
|
assert((U32)strat <= (U32)ZSTD_btultra);
|
|
return blockCompressor[extDict!=0][(U32)strat];
|
|
}
|
|
|
|
static void ZSTD_storeLastLiterals(seqStore_t* seqStorePtr,
|
|
const BYTE* anchor, size_t lastLLSize)
|
|
{
|
|
memcpy(seqStorePtr->lit, anchor, lastLLSize);
|
|
seqStorePtr->lit += lastLLSize;
|
|
}
|
|
|
|
static void ZSTD_resetSeqStore(seqStore_t* ssPtr)
|
|
{
|
|
ssPtr->lit = ssPtr->litStart;
|
|
ssPtr->sequences = ssPtr->sequencesStart;
|
|
ssPtr->longLengthID = 0;
|
|
}
|
|
|
|
static size_t ZSTD_compressBlock_internal(ZSTD_CCtx* zc,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_compressBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)",
|
|
(U32)dstCapacity, zc->blockState.matchState.dictLimit, zc->blockState.matchState.nextToUpdate);
|
|
if (srcSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1)
|
|
return 0; /* don't even attempt compression below a certain srcSize */
|
|
ZSTD_resetSeqStore(&(zc->seqStore));
|
|
|
|
/* limited update after a very long match */
|
|
{ const BYTE* const base = zc->blockState.matchState.base;
|
|
const BYTE* const istart = (const BYTE*)src;
|
|
const U32 current = (U32)(istart-base);
|
|
if (current > zc->blockState.matchState.nextToUpdate + 384)
|
|
zc->blockState.matchState.nextToUpdate = current - MIN(192, (U32)(current - zc->blockState.matchState.nextToUpdate - 384));
|
|
}
|
|
|
|
/* select and store sequences */
|
|
{ U32 const extDict = zc->blockState.matchState.lowLimit < zc->blockState.matchState.dictLimit;
|
|
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->appliedParams.ldmParams.enableLdm) {
|
|
typedef size_t (*ZSTD_ldmBlockCompressor)(
|
|
ldmState_t* ldms, ZSTD_matchState_t* ms, seqStore_t* seqStore,
|
|
U32 rep[ZSTD_REP_NUM], ZSTD_CCtx_params const* params,
|
|
void const* src, size_t srcSize);
|
|
ZSTD_ldmBlockCompressor const ldmBlockCompressor = extDict ? ZSTD_compressBlock_ldm_extDict : ZSTD_compressBlock_ldm;
|
|
lastLLSize = ldmBlockCompressor(&zc->ldmState, &zc->blockState.matchState, &zc->seqStore, zc->blockState.nextCBlock->rep, &zc->appliedParams, src, srcSize);
|
|
} else { /* not long range mode */
|
|
ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(zc->appliedParams.cParams.strategy, extDict);
|
|
lastLLSize = blockCompressor(&zc->blockState.matchState, &zc->seqStore, zc->blockState.nextCBlock->rep, &zc->appliedParams.cParams, src, srcSize);
|
|
}
|
|
{ const BYTE* const lastLiterals = (const BYTE*)src + srcSize - lastLLSize;
|
|
ZSTD_storeLastLiterals(&zc->seqStore, lastLiterals, lastLLSize);
|
|
} }
|
|
|
|
/* encode sequences and literals */
|
|
{ size_t const cSize = ZSTD_compressSequences(&zc->seqStore, &zc->blockState.prevCBlock->entropy, &zc->blockState.nextCBlock->entropy, &zc->appliedParams.cParams, dst, dstCapacity, srcSize, zc->entropyWorkspace);
|
|
if (ZSTD_isError(cSize) || cSize == 0) return cSize;
|
|
/* confirm repcodes and entropy tables */
|
|
{ ZSTD_compressedBlockState_t* const tmp = zc->blockState.prevCBlock;
|
|
zc->blockState.prevCBlock = zc->blockState.nextCBlock;
|
|
zc->blockState.nextCBlock = tmp;
|
|
}
|
|
return cSize;
|
|
}
|
|
}
|
|
|
|
|
|
/*! 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 <= 31);
|
|
|
|
DEBUGLOG(5, "ZSTD_compress_frameChunk (blockSize=%u)", (U32)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);
|
|
|
|
if (dstCapacity < ZSTD_blockHeaderSize + MIN_CBLOCK_SIZE)
|
|
return ERROR(dstSize_tooSmall); /* not enough space to store compressed block */
|
|
if (remaining < blockSize) blockSize = remaining;
|
|
|
|
/* preemptive overflow correction:
|
|
* 1. correction is large enough:
|
|
* lowLimit > (3<<29) ==> current > 3<<29 + 1<<windowLog - blockSize
|
|
* 1<<windowLog <= newCurrent < 1<<chainLog + 1<<windowLog
|
|
*
|
|
* current - newCurrent
|
|
* > (3<<29 + 1<<windowLog - blockSize) - (1<<windowLog + 1<<chainLog)
|
|
* > (3<<29 - blockSize) - (1<<chainLog)
|
|
* > (3<<29 - blockSize) - (1<<30) (NOTE: chainLog <= 30)
|
|
* > 1<<29 - 1<<17
|
|
*
|
|
* 2. (ip+blockSize - cctx->base) doesn't overflow:
|
|
* In 32 bit mode we limit windowLog to 30 so we don't get
|
|
* differences larger than 1<<31-1.
|
|
* 3. cctx->lowLimit < 1<<32:
|
|
* windowLog <= 31 ==> 3<<29 + 1<<windowLog < 7<<29 < 1<<32.
|
|
*/
|
|
if (ms->lowLimit > (3U<<29)) {
|
|
U32 const cycleMask = ((U32)1 << ZSTD_cycleLog(cctx->appliedParams.cParams.chainLog, cctx->appliedParams.cParams.strategy)) - 1;
|
|
U32 const current = (U32)(ip - cctx->blockState.matchState.base);
|
|
U32 const newCurrent = (current & cycleMask) + ((U32)1 << cctx->appliedParams.cParams.windowLog);
|
|
U32 const correction = current - newCurrent;
|
|
ZSTD_STATIC_ASSERT(ZSTD_CHAINLOG_MAX <= 30);
|
|
ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX_32 <= 30);
|
|
ZSTD_STATIC_ASSERT(ZSTD_WINDOWLOG_MAX <= 31);
|
|
assert(current > newCurrent);
|
|
assert(correction > 1<<28); /* Loose bound, should be about 1<<29 */
|
|
ZSTD_reduceIndex(cctx, correction);
|
|
ms->base += correction;
|
|
ms->dictBase += correction;
|
|
ms->lowLimit -= correction;
|
|
ms->dictLimit -= correction;
|
|
if (ms->nextToUpdate < correction) ms->nextToUpdate = 0;
|
|
else ms->nextToUpdate -= correction;
|
|
DEBUGLOG(4, "Correction of 0x%x bytes to lowLimit=0x%x", correction, ms->lowLimit);
|
|
}
|
|
/* enforce maxDist */
|
|
if ((U32)(ip+blockSize - ms->base) > ms->loadedDictEnd + maxDist) {
|
|
U32 const newLowLimit = (U32)(ip+blockSize - ms->base) - maxDist;
|
|
if (ms->lowLimit < newLowLimit) ms->lowLimit = newLowLimit;
|
|
if (ms->dictLimit < ms->lowLimit)
|
|
DEBUGLOG(5, "ZSTD_compress_frameChunk : update dictLimit from %u to %u ",
|
|
ms->dictLimit, ms->lowLimit);
|
|
if (ms->dictLimit < ms->lowLimit) ms->dictLimit = ms->lowLimit;
|
|
if (ms->nextToUpdate < ms->lowLimit) ms->nextToUpdate = ms->lowLimit;
|
|
}
|
|
|
|
{ size_t cSize = ZSTD_compressBlock_internal(cctx,
|
|
op+ZSTD_blockHeaderSize, dstCapacity-ZSTD_blockHeaderSize,
|
|
ip, blockSize);
|
|
if (ZSTD_isError(cSize)) return cSize;
|
|
|
|
if (cSize == 0) { /* block is not compressible */
|
|
U32 const cBlockHeader24 = lastBlock + (((U32)bt_raw)<<1) + (U32)(blockSize << 3);
|
|
if (blockSize + ZSTD_blockHeaderSize > dstCapacity) return ERROR(dstSize_tooSmall);
|
|
MEM_writeLE32(op, cBlockHeader24); /* 4th byte will be overwritten */
|
|
memcpy(op + ZSTD_blockHeaderSize, ip, blockSize);
|
|
cSize = ZSTD_blockHeaderSize + blockSize;
|
|
} else {
|
|
U32 const cBlockHeader24 = lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
|
|
MEM_writeLE24(op, cBlockHeader24);
|
|
cSize += ZSTD_blockHeaderSize;
|
|
}
|
|
|
|
ip += blockSize;
|
|
assert(remaining >= blockSize);
|
|
remaining -= blockSize;
|
|
op += cSize;
|
|
assert(dstCapacity >= cSize);
|
|
dstCapacity -= cSize;
|
|
DEBUGLOG(5, "ZSTD_compress_frameChunk: adding a block of size %u",
|
|
(U32)cSize);
|
|
} }
|
|
|
|
if (lastFrameChunk && (op>ostart)) cctx->stage = ZSTDcs_ending;
|
|
return op-ostart;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_writeFrameHeader(void* dst, size_t dstCapacity,
|
|
ZSTD_CCtx_params params, U64 pledgedSrcSize, U32 dictID)
|
|
{ BYTE* const op = (BYTE*)dst;
|
|
U32 const dictIDSizeCodeLength = (dictID>0) + (dictID>=256) + (dictID>=65536); /* 0-3 */
|
|
U32 const dictIDSizeCode = params.fParams.noDictIDFlag ? 0 : dictIDSizeCodeLength; /* 0-3 */
|
|
U32 const checksumFlag = params.fParams.checksumFlag>0;
|
|
U32 const windowSize = (U32)1 << params.cParams.windowLog;
|
|
U32 const singleSegment = params.fParams.contentSizeFlag && (windowSize >= pledgedSrcSize);
|
|
BYTE const windowLogByte = (BYTE)((params.cParams.windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN) << 3);
|
|
U32 const fcsCode = params.fParams.contentSizeFlag ?
|
|
(pledgedSrcSize>=256) + (pledgedSrcSize>=65536+256) + (pledgedSrcSize>=0xFFFFFFFFU) : 0; /* 0-3 */
|
|
BYTE const frameHeaderDecriptionByte = (BYTE)(dictIDSizeCode + (checksumFlag<<2) + (singleSegment<<5) + (fcsCode<<6) );
|
|
size_t pos=0;
|
|
|
|
if (dstCapacity < ZSTD_frameHeaderSize_max) return ERROR(dstSize_tooSmall);
|
|
DEBUGLOG(4, "ZSTD_writeFrameHeader : dictIDFlag : %u ; dictID : %u ; dictIDSizeCode : %u",
|
|
!params.fParams.noDictIDFlag, dictID, dictIDSizeCode);
|
|
|
|
if (params.format == ZSTD_f_zstd1) {
|
|
MEM_writeLE32(dst, ZSTD_MAGICNUMBER);
|
|
pos = 4;
|
|
}
|
|
op[pos++] = frameHeaderDecriptionByte;
|
|
if (!singleSegment) op[pos++] = windowLogByte;
|
|
switch(dictIDSizeCode)
|
|
{
|
|
default: assert(0); /* impossible */
|
|
case 0 : break;
|
|
case 1 : op[pos] = (BYTE)(dictID); pos++; break;
|
|
case 2 : MEM_writeLE16(op+pos, (U16)dictID); pos+=2; break;
|
|
case 3 : MEM_writeLE32(op+pos, dictID); pos+=4; break;
|
|
}
|
|
switch(fcsCode)
|
|
{
|
|
default: assert(0); /* impossible */
|
|
case 0 : if (singleSegment) op[pos++] = (BYTE)(pledgedSrcSize); break;
|
|
case 1 : MEM_writeLE16(op+pos, (U16)(pledgedSrcSize-256)); pos+=2; break;
|
|
case 2 : MEM_writeLE32(op+pos, (U32)(pledgedSrcSize)); pos+=4; break;
|
|
case 3 : MEM_writeLE64(op+pos, (U64)(pledgedSrcSize)); pos+=8; break;
|
|
}
|
|
return pos;
|
|
}
|
|
|
|
/* 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 `dstCapcity` is too small (<ZSTD_blockHeaderSize)
|
|
*/
|
|
size_t ZSTD_writeLastEmptyBlock(void* dst, size_t dstCapacity)
|
|
{
|
|
if (dstCapacity < ZSTD_blockHeaderSize) return ERROR(dstSize_tooSmall);
|
|
{ U32 const cBlockHeader24 = 1 /*lastBlock*/ + (((U32)bt_raw)<<1); /* 0 size */
|
|
MEM_writeLE24(dst, cBlockHeader24);
|
|
return ZSTD_blockHeaderSize;
|
|
}
|
|
}
|
|
|
|
|
|
static void ZSTD_manageWindowContinuity(ZSTD_matchState_t* ms, void const* src, size_t srcSize)
|
|
{
|
|
const BYTE* const ip = (const BYTE*) src;
|
|
|
|
/* Check if blocks follow each other */
|
|
if (src != ms->nextSrc) {
|
|
/* not contiguous */
|
|
size_t const distanceFromBase = (size_t)(ms->nextSrc - ms->base);
|
|
DEBUGLOG(5, "ZSTD_manageWindowContinuity: non contiguous blocks, new segment starts at %u", ms->dictLimit);
|
|
ms->lowLimit = ms->dictLimit;
|
|
assert(distanceFromBase == (size_t)(U32)distanceFromBase); /* should never overflow */
|
|
ms->dictLimit = (U32)distanceFromBase;
|
|
ms->dictBase = ms->base;
|
|
ms->base = ip - distanceFromBase;
|
|
ms->nextToUpdate = ms->dictLimit;
|
|
if (ms->dictLimit - ms->lowLimit < HASH_READ_SIZE) ms->lowLimit = ms->dictLimit; /* too small extDict */
|
|
}
|
|
ms->nextSrc = ip + srcSize;
|
|
/* if input and dictionary overlap : reduce dictionary (area presumed modified by input) */
|
|
if ((ip+srcSize > ms->dictBase + ms->lowLimit) & (ip < ms->dictBase + ms->dictLimit)) {
|
|
ptrdiff_t const highInputIdx = (ip + srcSize) - ms->dictBase;
|
|
U32 const lowLimitMax = (highInputIdx > (ptrdiff_t)ms->dictLimit) ? ms->dictLimit : (U32)highInputIdx;
|
|
ms->lowLimit = lowLimitMax;
|
|
}
|
|
}
|
|
|
|
|
|
static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
U32 frame, U32 lastFrameChunk)
|
|
{
|
|
size_t fhSize = 0;
|
|
|
|
DEBUGLOG(5, "ZSTD_compressContinue_internal, stage: %u, srcSize: %u",
|
|
cctx->stage, (U32)srcSize);
|
|
if (cctx->stage==ZSTDcs_created) return ERROR(stage_wrong); /* missing init (ZSTD_compressBegin) */
|
|
|
|
if (frame && (cctx->stage==ZSTDcs_init)) {
|
|
fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->appliedParams,
|
|
cctx->pledgedSrcSizePlusOne-1, cctx->dictID);
|
|
if (ZSTD_isError(fhSize)) return fhSize;
|
|
dstCapacity -= fhSize;
|
|
dst = (char*)dst + fhSize;
|
|
cctx->stage = ZSTDcs_ongoing;
|
|
}
|
|
|
|
if (!srcSize) return fhSize; /* do not generate an empty block if no input */
|
|
|
|
ZSTD_manageWindowContinuity(&cctx->blockState.matchState, src, srcSize);
|
|
|
|
DEBUGLOG(5, "ZSTD_compressContinue_internal (blockSize=%u)", (U32)cctx->blockSize);
|
|
{ size_t const cSize = frame ?
|
|
ZSTD_compress_frameChunk (cctx, dst, dstCapacity, src, srcSize, lastFrameChunk) :
|
|
ZSTD_compressBlock_internal (cctx, dst, dstCapacity, src, srcSize);
|
|
if (ZSTD_isError(cSize)) return cSize;
|
|
cctx->consumedSrcSize += srcSize;
|
|
cctx->producedCSize += (cSize + fhSize);
|
|
if (cctx->appliedParams.fParams.contentSizeFlag) { /* control src size */
|
|
if (cctx->consumedSrcSize+1 > cctx->pledgedSrcSizePlusOne) {
|
|
DEBUGLOG(4, "error : pledgedSrcSize = %u, while realSrcSize >= %u",
|
|
(U32)cctx->pledgedSrcSizePlusOne-1, (U32)cctx->consumedSrcSize);
|
|
return ERROR(srcSize_wrong);
|
|
}
|
|
}
|
|
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)", (U32)srcSize);
|
|
return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 1 /* frame mode */, 0 /* last chunk */);
|
|
}
|
|
|
|
|
|
size_t ZSTD_getBlockSize(const ZSTD_CCtx* cctx)
|
|
{
|
|
ZSTD_compressionParameters const cParams =
|
|
ZSTD_getCParamsFromCCtxParams(cctx->appliedParams, 0, 0);
|
|
return MIN (ZSTD_BLOCKSIZE_MAX, (U32)1 << cParams.windowLog);
|
|
}
|
|
|
|
size_t ZSTD_compressBlock(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
size_t const blockSizeMax = ZSTD_getBlockSize(cctx);
|
|
if (srcSize > blockSizeMax) return ERROR(srcSize_wrong);
|
|
return ZSTD_compressContinue_internal(cctx, dst, dstCapacity, src, srcSize, 0 /* frame mode */, 0 /* last chunk */);
|
|
}
|
|
|
|
/*! ZSTD_loadDictionaryContent() :
|
|
* @return : 0, or an error code
|
|
*/
|
|
static size_t ZSTD_loadDictionaryContent(ZSTD_matchState_t* ms, ZSTD_CCtx_params const* params, const void* src, size_t srcSize)
|
|
{
|
|
const BYTE* const ip = (const BYTE*) src;
|
|
const BYTE* const iend = ip + srcSize;
|
|
ZSTD_compressionParameters const* cParams = ¶ms->cParams;
|
|
|
|
/* input becomes current prefix */
|
|
ms->lowLimit = ms->dictLimit;
|
|
ms->dictLimit = (U32)(ms->nextSrc - ms->base);
|
|
ms->dictBase = ms->base;
|
|
ms->base = ip - ms->dictLimit;
|
|
ms->nextToUpdate = ms->dictLimit;
|
|
ms->loadedDictEnd = params->forceWindow ? 0 : (U32)(iend - ms->base);
|
|
|
|
ms->nextSrc = iend;
|
|
if (srcSize <= HASH_READ_SIZE) return 0;
|
|
|
|
switch(params->cParams.strategy)
|
|
{
|
|
case ZSTD_fast:
|
|
ZSTD_fillHashTable(ms, cParams, iend);
|
|
break;
|
|
case ZSTD_dfast:
|
|
ZSTD_fillDoubleHashTable(ms, cParams, iend);
|
|
break;
|
|
|
|
case ZSTD_greedy:
|
|
case ZSTD_lazy:
|
|
case ZSTD_lazy2:
|
|
if (srcSize >= HASH_READ_SIZE)
|
|
ZSTD_insertAndFindFirstIndex(ms, cParams, iend-HASH_READ_SIZE);
|
|
break;
|
|
|
|
case ZSTD_btlazy2: /* we want the dictionary table fully sorted */
|
|
case ZSTD_btopt:
|
|
case ZSTD_btultra:
|
|
if (srcSize >= HASH_READ_SIZE)
|
|
ZSTD_updateTree(ms, cParams, iend-HASH_READ_SIZE, iend);
|
|
break;
|
|
|
|
default:
|
|
assert(0); /* not possible : not a valid strategy id */
|
|
}
|
|
|
|
ms->nextToUpdate = (U32)(iend - ms->base);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Dictionaries that assign zero probability to symbols that show up causes problems
|
|
when FSE encoding. Refuse dictionaries that assign zero probability to symbols
|
|
that we may encounter during compression.
|
|
NOTE: This behavior is not standard and could be improved in the future. */
|
|
static size_t ZSTD_checkDictNCount(short* normalizedCounter, unsigned dictMaxSymbolValue, unsigned maxSymbolValue) {
|
|
U32 s;
|
|
if (dictMaxSymbolValue < maxSymbolValue) return ERROR(dictionary_corrupted);
|
|
for (s = 0; s <= maxSymbolValue; ++s) {
|
|
if (normalizedCounter[s] == 0) return ERROR(dictionary_corrupted);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Dictionary format :
|
|
* See :
|
|
* https://github.com/facebook/zstd/blob/master/doc/zstd_compression_format.md#dictionary-format
|
|
*/
|
|
/*! ZSTD_loadZstdDictionary() :
|
|
* @return : 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_CCtx_params const* params, const void* dict, size_t dictSize, void* workspace)
|
|
{
|
|
const BYTE* dictPtr = (const BYTE*)dict;
|
|
const BYTE* const dictEnd = dictPtr + dictSize;
|
|
short offcodeNCount[MaxOff+1];
|
|
unsigned offcodeMaxValue = MaxOff;
|
|
size_t dictID;
|
|
|
|
ZSTD_STATIC_ASSERT(HUF_WORKSPACE_SIZE >= (1<<MAX(MLFSELog,LLFSELog)));
|
|
|
|
dictPtr += 4; /* skip magic number */
|
|
dictID = params->fParams.noDictIDFlag ? 0 : MEM_readLE32(dictPtr);
|
|
dictPtr += 4;
|
|
|
|
{ unsigned maxSymbolValue = 255;
|
|
size_t const hufHeaderSize = HUF_readCTable((HUF_CElt*)bs->entropy.hufCTable, &maxSymbolValue, dictPtr, dictEnd-dictPtr);
|
|
if (HUF_isError(hufHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (maxSymbolValue < 255) return ERROR(dictionary_corrupted);
|
|
dictPtr += hufHeaderSize;
|
|
}
|
|
|
|
{ unsigned offcodeLog;
|
|
size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr);
|
|
if (FSE_isError(offcodeHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (offcodeLog > OffFSELog) return ERROR(dictionary_corrupted);
|
|
/* Defer checking offcodeMaxValue because we need to know the size of the dictionary content */
|
|
CHECK_E( FSE_buildCTable_wksp(bs->entropy.offcodeCTable, offcodeNCount, offcodeMaxValue, offcodeLog, workspace, HUF_WORKSPACE_SIZE),
|
|
dictionary_corrupted);
|
|
dictPtr += offcodeHeaderSize;
|
|
}
|
|
|
|
{ short matchlengthNCount[MaxML+1];
|
|
unsigned matchlengthMaxValue = MaxML, matchlengthLog;
|
|
size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr);
|
|
if (FSE_isError(matchlengthHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (matchlengthLog > MLFSELog) return ERROR(dictionary_corrupted);
|
|
/* Every match length code must have non-zero probability */
|
|
CHECK_F( ZSTD_checkDictNCount(matchlengthNCount, matchlengthMaxValue, MaxML));
|
|
CHECK_E( FSE_buildCTable_wksp(bs->entropy.matchlengthCTable, matchlengthNCount, matchlengthMaxValue, matchlengthLog, workspace, HUF_WORKSPACE_SIZE),
|
|
dictionary_corrupted);
|
|
dictPtr += matchlengthHeaderSize;
|
|
}
|
|
|
|
{ short litlengthNCount[MaxLL+1];
|
|
unsigned litlengthMaxValue = MaxLL, litlengthLog;
|
|
size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr);
|
|
if (FSE_isError(litlengthHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (litlengthLog > LLFSELog) return ERROR(dictionary_corrupted);
|
|
/* Every literal length code must have non-zero probability */
|
|
CHECK_F( ZSTD_checkDictNCount(litlengthNCount, litlengthMaxValue, MaxLL));
|
|
CHECK_E( FSE_buildCTable_wksp(bs->entropy.litlengthCTable, litlengthNCount, litlengthMaxValue, litlengthLog, workspace, HUF_WORKSPACE_SIZE),
|
|
dictionary_corrupted);
|
|
dictPtr += litlengthHeaderSize;
|
|
}
|
|
|
|
if (dictPtr+12 > dictEnd) return ERROR(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 */
|
|
CHECK_F (ZSTD_checkDictNCount(offcodeNCount, offcodeMaxValue, MIN(offcodeMax, MaxOff)));
|
|
/* All repCodes must be <= dictContentSize and != 0*/
|
|
{ U32 u;
|
|
for (u=0; u<3; u++) {
|
|
if (bs->rep[u] == 0) return ERROR(dictionary_corrupted);
|
|
if (bs->rep[u] > dictContentSize) return ERROR(dictionary_corrupted);
|
|
} }
|
|
|
|
bs->entropy.hufCTable_repeatMode = HUF_repeat_valid;
|
|
bs->entropy.offcode_repeatMode = FSE_repeat_valid;
|
|
bs->entropy.matchlength_repeatMode = FSE_repeat_valid;
|
|
bs->entropy.litlength_repeatMode = FSE_repeat_valid;
|
|
CHECK_F(ZSTD_loadDictionaryContent(ms, params, dictPtr, dictContentSize));
|
|
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,
|
|
ZSTD_CCtx_params const* params,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictMode_e dictMode,
|
|
void* workspace)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_compress_insertDictionary (dictSize=%u)", (U32)dictSize);
|
|
if ((dict==NULL) || (dictSize<=8)) return 0;
|
|
|
|
ZSTD_reset_compressedBlockState(bs);
|
|
|
|
/* dict restricted modes */
|
|
if (dictMode==ZSTD_dm_rawContent)
|
|
return ZSTD_loadDictionaryContent(ms, params, dict, dictSize);
|
|
|
|
if (MEM_readLE32(dict) != ZSTD_MAGIC_DICTIONARY) {
|
|
if (dictMode == ZSTD_dm_auto) {
|
|
DEBUGLOG(4, "raw content dictionary detected");
|
|
return ZSTD_loadDictionaryContent(ms, params, dict, dictSize);
|
|
}
|
|
if (dictMode == ZSTD_dm_fullDict)
|
|
return ERROR(dictionary_wrong);
|
|
assert(0); /* impossible */
|
|
}
|
|
|
|
/* dict as full zstd dictionary */
|
|
return ZSTD_loadZstdDictionary(bs, ms, params, dict, dictSize, workspace);
|
|
}
|
|
|
|
/*! ZSTD_compressBegin_internal() :
|
|
* @return : 0, or an error code */
|
|
size_t ZSTD_compressBegin_internal(ZSTD_CCtx* cctx,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictMode_e dictMode,
|
|
const ZSTD_CDict* cdict,
|
|
ZSTD_CCtx_params params, U64 pledgedSrcSize,
|
|
ZSTD_buffered_policy_e zbuff)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_compressBegin_internal: 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) {
|
|
cctx->requestedParams = params;
|
|
return ZSTD_resetCCtx_usingCDict(cctx, cdict, params.cParams.windowLog,
|
|
params.fParams, pledgedSrcSize, zbuff);
|
|
}
|
|
|
|
CHECK_F( ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
|
|
ZSTDcrp_continue, zbuff) );
|
|
{
|
|
size_t const dictID = ZSTD_compress_insertDictionary(
|
|
cctx->blockState.prevCBlock, &cctx->blockState.matchState,
|
|
¶ms, dict, dictSize, dictMode, cctx->entropyWorkspace);
|
|
if (ZSTD_isError(dictID)) return dictID;
|
|
assert(dictID <= (size_t)(U32)-1);
|
|
cctx->dictID = (U32)dictID;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_compressBegin_advanced_internal(ZSTD_CCtx* cctx,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictMode_e dictMode,
|
|
const ZSTD_CDict* cdict,
|
|
ZSTD_CCtx_params params,
|
|
unsigned long long pledgedSrcSize)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_compressBegin_advanced_internal: wlog=%u", params.cParams.windowLog);
|
|
/* compression parameters verification and optimization */
|
|
CHECK_F( ZSTD_checkCParams(params.cParams) );
|
|
return ZSTD_compressBegin_internal(cctx,
|
|
dict, dictSize, dictMode,
|
|
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 const cctxParams =
|
|
ZSTD_assignParamsToCCtxParams(cctx->requestedParams, params);
|
|
return ZSTD_compressBegin_advanced_internal(cctx,
|
|
dict, dictSize, ZSTD_dm_auto,
|
|
NULL /*cdict*/,
|
|
cctxParams, pledgedSrcSize);
|
|
}
|
|
|
|
size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_parameters const params = ZSTD_getParams(compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN, dictSize);
|
|
ZSTD_CCtx_params const cctxParams =
|
|
ZSTD_assignParamsToCCtxParams(cctx->requestedParams, params);
|
|
DEBUGLOG(4, "ZSTD_compressBegin_usingDict (dictSize=%u)", (U32)dictSize);
|
|
return ZSTD_compressBegin_internal(cctx, dict, dictSize, ZSTD_dm_auto, 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");
|
|
if (cctx->stage == ZSTDcs_created) return ERROR(stage_wrong); /* init missing */
|
|
|
|
/* special case : empty frame */
|
|
if (cctx->stage == ZSTDcs_init) {
|
|
fhSize = ZSTD_writeFrameHeader(dst, dstCapacity, cctx->appliedParams, 0, 0);
|
|
if (ZSTD_isError(fhSize)) return fhSize;
|
|
dstCapacity -= fhSize;
|
|
op += fhSize;
|
|
cctx->stage = ZSTDcs_ongoing;
|
|
}
|
|
|
|
if (cctx->stage != ZSTDcs_ending) {
|
|
/* write one last empty block, make it the "last" block */
|
|
U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1) + 0;
|
|
if (dstCapacity<4) return ERROR(dstSize_tooSmall);
|
|
MEM_writeLE32(op, cBlockHeader24);
|
|
op += ZSTD_blockHeaderSize;
|
|
dstCapacity -= ZSTD_blockHeaderSize;
|
|
}
|
|
|
|
if (cctx->appliedParams.fParams.checksumFlag) {
|
|
U32 const checksum = (U32) XXH64_digest(&cctx->xxhState);
|
|
if (dstCapacity<4) return ERROR(dstSize_tooSmall);
|
|
DEBUGLOG(4, "ZSTD_writeEpilogue: write checksum : %08X", checksum);
|
|
MEM_writeLE32(op, checksum);
|
|
op += 4;
|
|
}
|
|
|
|
cctx->stage = ZSTDcs_created; /* return to "created but no init" status */
|
|
return op-ostart;
|
|
}
|
|
|
|
size_t ZSTD_compressEnd (ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
size_t endResult;
|
|
size_t const cSize = ZSTD_compressContinue_internal(cctx,
|
|
dst, dstCapacity, src, srcSize,
|
|
1 /* frame mode */, 1 /* last chunk */);
|
|
if (ZSTD_isError(cSize)) return cSize;
|
|
endResult = ZSTD_writeEpilogue(cctx, (char*)dst + cSize, dstCapacity-cSize);
|
|
if (ZSTD_isError(endResult)) return endResult;
|
|
if (cctx->appliedParams.fParams.contentSizeFlag) { /* control src size */
|
|
DEBUGLOG(4, "end of frame : controlling src size");
|
|
if (cctx->pledgedSrcSizePlusOne != cctx->consumedSrcSize+1) {
|
|
DEBUGLOG(4, "error : pledgedSrcSize = %u, while realSrcSize = %u",
|
|
(U32)cctx->pledgedSrcSizePlusOne-1, (U32)cctx->consumedSrcSize);
|
|
return ERROR(srcSize_wrong);
|
|
} }
|
|
return cSize + endResult;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_compress_internal (ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict,size_t dictSize,
|
|
ZSTD_parameters params)
|
|
{
|
|
ZSTD_CCtx_params const cctxParams =
|
|
ZSTD_assignParamsToCCtxParams(cctx->requestedParams, params);
|
|
DEBUGLOG(4, "ZSTD_compress_internal");
|
|
return ZSTD_compress_advanced_internal(cctx,
|
|
dst, dstCapacity,
|
|
src, srcSize,
|
|
dict, dictSize,
|
|
cctxParams);
|
|
}
|
|
|
|
size_t ZSTD_compress_advanced (ZSTD_CCtx* ctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict,size_t dictSize,
|
|
ZSTD_parameters params)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_compress_advanced");
|
|
CHECK_F(ZSTD_checkCParams(params.cParams));
|
|
return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params);
|
|
}
|
|
|
|
/* Internal */
|
|
size_t ZSTD_compress_advanced_internal(
|
|
ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict,size_t dictSize,
|
|
ZSTD_CCtx_params params)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_compress_advanced_internal");
|
|
CHECK_F( ZSTD_compressBegin_internal(cctx, dict, dictSize, ZSTD_dm_auto, NULL,
|
|
params, srcSize, ZSTDb_not_buffered) );
|
|
return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
|
|
}
|
|
|
|
size_t ZSTD_compress_usingDict(ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize,
|
|
const void* dict, size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_parameters params = ZSTD_getParams(compressionLevel, srcSize ? srcSize : 1, dict ? dictSize : 0);
|
|
params.fParams.contentSizeFlag = 1;
|
|
DEBUGLOG(4, "ZSTD_compress_usingDict (level=%i, srcSize=%u, dictSize=%u)",
|
|
compressionLevel, (U32)srcSize, (U32)dictSize);
|
|
return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params);
|
|
}
|
|
|
|
size_t ZSTD_compressCCtx (ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_compressCCtx (srcSize=%u)", (U32)srcSize);
|
|
return ZSTD_compress_usingDict(ctx, dst, dstCapacity, src, srcSize, NULL, 0, compressionLevel);
|
|
}
|
|
|
|
size_t ZSTD_compress(void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel)
|
|
{
|
|
size_t result;
|
|
ZSTD_CCtx ctxBody;
|
|
memset(&ctxBody, 0, sizeof(ctxBody));
|
|
ctxBody.customMem = ZSTD_defaultCMem;
|
|
result = ZSTD_compressCCtx(&ctxBody, dst, dstCapacity, src, srcSize, compressionLevel);
|
|
ZSTD_free(ctxBody.workSpace, ZSTD_defaultCMem); /* can't free ctxBody itself, as it's on stack; free only heap content */
|
|
return result;
|
|
}
|
|
|
|
|
|
/* ===== Dictionary API ===== */
|
|
|
|
/*! ZSTD_estimateCDictSize_advanced() :
|
|
* Estimate amount of memory that will be needed to create a dictionary with following arguments */
|
|
size_t ZSTD_estimateCDictSize_advanced(
|
|
size_t dictSize, ZSTD_compressionParameters cParams,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod)
|
|
{
|
|
DEBUGLOG(5, "sizeof(ZSTD_CDict) : %u", (U32)sizeof(ZSTD_CDict));
|
|
return sizeof(ZSTD_CDict) + HUF_WORKSPACE_SIZE + ZSTD_sizeof_matchState(&cParams, /* forCCtx */ 0)
|
|
+ (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize);
|
|
}
|
|
|
|
size_t ZSTD_estimateCDictSize(size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
|
|
return ZSTD_estimateCDictSize_advanced(dictSize, cParams, ZSTD_dlm_byCopy);
|
|
}
|
|
|
|
size_t ZSTD_sizeof_CDict(const ZSTD_CDict* cdict)
|
|
{
|
|
if (cdict==NULL) return 0; /* support sizeof on NULL */
|
|
DEBUGLOG(5, "sizeof(*cdict) : %u", (U32)sizeof(*cdict));
|
|
return cdict->workspaceSize + (cdict->dictBuffer ? cdict->dictContentSize : 0) + sizeof(*cdict);
|
|
}
|
|
|
|
static size_t ZSTD_initCDict_internal(
|
|
ZSTD_CDict* cdict,
|
|
const void* dictBuffer, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictMode_e dictMode,
|
|
ZSTD_compressionParameters cParams)
|
|
{
|
|
DEBUGLOG(3, "ZSTD_initCDict_internal, mode %u", (U32)dictMode);
|
|
cdict->cParams = cParams;
|
|
if ((dictLoadMethod == ZSTD_dlm_byRef) || (!dictBuffer) || (!dictSize)) {
|
|
cdict->dictBuffer = NULL;
|
|
cdict->dictContent = dictBuffer;
|
|
} else {
|
|
void* const internalBuffer = ZSTD_malloc(dictSize, cdict->customMem);
|
|
cdict->dictBuffer = internalBuffer;
|
|
cdict->dictContent = internalBuffer;
|
|
if (!internalBuffer) return ERROR(memory_allocation);
|
|
memcpy(internalBuffer, dictBuffer, dictSize);
|
|
}
|
|
cdict->dictContentSize = dictSize;
|
|
|
|
/* Reset the state to no dictionary */
|
|
ZSTD_reset_compressedBlockState(&cdict->cBlockState);
|
|
{
|
|
void* const end = ZSTD_reset_matchState(
|
|
&cdict->matchState,
|
|
(U32*)cdict->workspace + HUF_WORKSPACE_SIZE_U32,
|
|
&cParams, ZSTDcrp_continue, /* forCCtx */ 0);
|
|
assert(end == (char*)cdict->workspace + cdict->workspaceSize);
|
|
(void)end;
|
|
}
|
|
/* (Maybe) load the dictionary
|
|
* Skips loading the dictionary if it is <= 8 bytes.
|
|
*/
|
|
{
|
|
ZSTD_CCtx_params params;
|
|
memset(¶ms, 0, sizeof(params));
|
|
params.compressionLevel = ZSTD_CLEVEL_DEFAULT;
|
|
params.fParams.contentSizeFlag = 1;
|
|
params.cParams = cParams;
|
|
{
|
|
size_t const dictID = ZSTD_compress_insertDictionary(
|
|
&cdict->cBlockState, &cdict->matchState,¶ms,
|
|
cdict->dictContent, cdict->dictContentSize,
|
|
dictMode, cdict->workspace);
|
|
if (ZSTD_isError(dictID)) return dictID;
|
|
assert(dictID <= (size_t)(U32)-1);
|
|
cdict->dictID = (U32)dictID;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
ZSTD_CDict* ZSTD_createCDict_advanced(const void* dictBuffer, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictMode_e dictMode,
|
|
ZSTD_compressionParameters cParams, ZSTD_customMem customMem)
|
|
{
|
|
DEBUGLOG(3, "ZSTD_createCDict_advanced, mode %u", (U32)dictMode);
|
|
if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
|
|
|
|
{ ZSTD_CDict* const cdict = (ZSTD_CDict*)ZSTD_malloc(sizeof(ZSTD_CDict), customMem);
|
|
size_t const workspaceSize = HUF_WORKSPACE_SIZE + ZSTD_sizeof_matchState(&cParams, /* forCCtx */ 0);
|
|
void* const workspace = ZSTD_malloc(workspaceSize, customMem);
|
|
|
|
if (!cdict || !workspace) {
|
|
ZSTD_free(cdict, customMem);
|
|
ZSTD_free(workspace, customMem);
|
|
return NULL;
|
|
}
|
|
cdict->customMem = customMem;
|
|
cdict->workspace = workspace;
|
|
cdict->workspaceSize = workspaceSize;
|
|
if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
|
|
dictBuffer, dictSize,
|
|
dictLoadMethod, dictMode,
|
|
cParams) )) {
|
|
ZSTD_freeCDict(cdict);
|
|
return NULL;
|
|
}
|
|
|
|
return cdict;
|
|
}
|
|
}
|
|
|
|
ZSTD_CDict* ZSTD_createCDict(const void* dict, size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_compressionParameters cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
|
|
return ZSTD_createCDict_advanced(dict, dictSize,
|
|
ZSTD_dlm_byCopy, ZSTD_dm_auto,
|
|
cParams, ZSTD_defaultCMem);
|
|
}
|
|
|
|
ZSTD_CDict* ZSTD_createCDict_byReference(const void* dict, size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_compressionParameters cParams = ZSTD_getCParams(compressionLevel, 0, dictSize);
|
|
return ZSTD_createCDict_advanced(dict, dictSize,
|
|
ZSTD_dlm_byRef, ZSTD_dm_auto,
|
|
cParams, ZSTD_defaultCMem);
|
|
}
|
|
|
|
size_t ZSTD_freeCDict(ZSTD_CDict* cdict)
|
|
{
|
|
if (cdict==NULL) return 0; /* support free on NULL */
|
|
{ ZSTD_customMem const cMem = cdict->customMem;
|
|
ZSTD_free(cdict->workspace, cMem);
|
|
ZSTD_free(cdict->dictBuffer, cMem);
|
|
ZSTD_free(cdict, cMem);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*! ZSTD_initStaticCDict_advanced() :
|
|
* Generate a digested dictionary in provided memory area.
|
|
* workspace: The memory area to emplace the dictionary into.
|
|
* Provided pointer must 8-bytes aligned.
|
|
* It must outlive dictionary usage.
|
|
* workspaceSize: Use ZSTD_estimateCDictSize()
|
|
* to determine how large workspace must be.
|
|
* cParams : use ZSTD_getCParams() to transform a compression level
|
|
* into its relevants cParams.
|
|
* @return : pointer to ZSTD_CDict*, or NULL if error (size too small)
|
|
* Note : there is no corresponding "free" function.
|
|
* Since workspace was allocated externally, it must be freed externally.
|
|
*/
|
|
const ZSTD_CDict* ZSTD_initStaticCDict(
|
|
void* workspace, size_t workspaceSize,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictMode_e dictMode,
|
|
ZSTD_compressionParameters cParams)
|
|
{
|
|
size_t const matchStateSize = ZSTD_sizeof_matchState(&cParams, /* forCCtx */ 0);
|
|
size_t const neededSize = sizeof(ZSTD_CDict) + (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize)
|
|
+ HUF_WORKSPACE_SIZE + matchStateSize;
|
|
ZSTD_CDict* const cdict = (ZSTD_CDict*) workspace;
|
|
void* ptr;
|
|
if ((size_t)workspace & 7) return NULL; /* 8-aligned */
|
|
DEBUGLOG(4, "(workspaceSize < neededSize) : (%u < %u) => %u",
|
|
(U32)workspaceSize, (U32)neededSize, (U32)(workspaceSize < neededSize));
|
|
if (workspaceSize < neededSize) return NULL;
|
|
|
|
if (dictLoadMethod == ZSTD_dlm_byCopy) {
|
|
memcpy(cdict+1, dict, dictSize);
|
|
dict = cdict+1;
|
|
ptr = (char*)workspace + sizeof(ZSTD_CDict) + dictSize;
|
|
} else {
|
|
ptr = cdict+1;
|
|
}
|
|
cdict->workspace = ptr;
|
|
cdict->workspaceSize = HUF_WORKSPACE_SIZE + matchStateSize;
|
|
|
|
if (ZSTD_isError( ZSTD_initCDict_internal(cdict,
|
|
dict, dictSize,
|
|
ZSTD_dlm_byRef, dictMode,
|
|
cParams) ))
|
|
return NULL;
|
|
|
|
return cdict;
|
|
}
|
|
|
|
ZSTD_compressionParameters ZSTD_getCParamsFromCDict(const ZSTD_CDict* cdict)
|
|
{
|
|
assert(cdict != NULL);
|
|
return cdict->cParams;
|
|
}
|
|
|
|
/* ZSTD_compressBegin_usingCDict_advanced() :
|
|
* cdict must be != NULL */
|
|
size_t ZSTD_compressBegin_usingCDict_advanced(
|
|
ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict,
|
|
ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_compressBegin_usingCDict_advanced");
|
|
if (cdict==NULL) return ERROR(dictionary_wrong);
|
|
{ ZSTD_CCtx_params params = cctx->requestedParams;
|
|
params.cParams = ZSTD_getCParamsFromCDict(cdict);
|
|
/* 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;
|
|
params.cParams.windowLog = MAX(params.cParams.windowLog, limitedSrcLog);
|
|
}
|
|
params.fParams = fParams;
|
|
return ZSTD_compressBegin_internal(cctx,
|
|
NULL, 0, ZSTD_dm_auto,
|
|
cdict,
|
|
params, pledgedSrcSize,
|
|
ZSTDb_not_buffered);
|
|
}
|
|
}
|
|
|
|
/* ZSTD_compressBegin_usingCDict() :
|
|
* pledgedSrcSize=0 means "unknown"
|
|
* if pledgedSrcSize>0, it will enable contentSizeFlag */
|
|
size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
|
|
{
|
|
ZSTD_frameParameters const fParams = { 0 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
|
|
DEBUGLOG(4, "ZSTD_compressBegin_usingCDict : dictIDFlag == %u", !fParams.noDictIDFlag);
|
|
return ZSTD_compressBegin_usingCDict_advanced(cctx, cdict, fParams, 0);
|
|
}
|
|
|
|
size_t ZSTD_compress_usingCDict_advanced(ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const ZSTD_CDict* cdict, ZSTD_frameParameters fParams)
|
|
{
|
|
CHECK_F (ZSTD_compressBegin_usingCDict_advanced(cctx, cdict, fParams, srcSize)); /* will check if cdict != NULL */
|
|
return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
|
|
}
|
|
|
|
/*! ZSTD_compress_usingCDict() :
|
|
* Compression using a digested Dictionary.
|
|
* Faster startup than ZSTD_compress_usingDict(), recommended when same dictionary is used multiple times.
|
|
* Note that compression parameters are decided at CDict creation time
|
|
* while frame parameters are hardcoded */
|
|
size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const ZSTD_CDict* cdict)
|
|
{
|
|
ZSTD_frameParameters const fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
|
|
return ZSTD_compress_usingCDict_advanced(cctx, dst, dstCapacity, src, srcSize, cdict, fParams);
|
|
}
|
|
|
|
|
|
|
|
/* ******************************************************************
|
|
* Streaming
|
|
********************************************************************/
|
|
|
|
ZSTD_CStream* ZSTD_createCStream(void)
|
|
{
|
|
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 size_t ZSTD_resetCStream_internal(ZSTD_CStream* zcs,
|
|
const void* const dict, size_t const dictSize, ZSTD_dictMode_e const dictMode,
|
|
const ZSTD_CDict* const cdict,
|
|
ZSTD_CCtx_params const params, unsigned long long const pledgedSrcSize)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_resetCStream_internal");
|
|
/* params are supposed to be fully validated at this point */
|
|
assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
|
|
assert(!((dict) && (cdict))); /* either dict or cdict, not both */
|
|
|
|
CHECK_F( ZSTD_compressBegin_internal(zcs,
|
|
dict, dictSize, dictMode,
|
|
cdict,
|
|
params, pledgedSrcSize,
|
|
ZSTDb_buffered) );
|
|
|
|
zcs->inToCompress = 0;
|
|
zcs->inBuffPos = 0;
|
|
zcs->inBuffTarget = zcs->blockSize
|
|
+ (zcs->blockSize == pledgedSrcSize); /* 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 */
|
|
zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0;
|
|
zcs->streamStage = zcss_load;
|
|
zcs->frameEnded = 0;
|
|
return 0; /* ready to go */
|
|
}
|
|
|
|
/* ZSTD_resetCStream():
|
|
* pledgedSrcSize == 0 means "unknown" */
|
|
size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pledgedSrcSize)
|
|
{
|
|
ZSTD_CCtx_params params = zcs->requestedParams;
|
|
DEBUGLOG(4, "ZSTD_resetCStream: pledgedSrcSize = %u", (U32)pledgedSrcSize);
|
|
if (pledgedSrcSize==0) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN;
|
|
params.fParams.contentSizeFlag = 1;
|
|
params.cParams = ZSTD_getCParamsFromCCtxParams(params, pledgedSrcSize, 0);
|
|
return ZSTD_resetCStream_internal(zcs, NULL, 0, ZSTD_dm_auto, zcs->cdict, params, pledgedSrcSize);
|
|
}
|
|
|
|
/*! 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,
|
|
ZSTD_CCtx_params params, unsigned long long pledgedSrcSize)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_initCStream_internal");
|
|
assert(!ZSTD_isError(ZSTD_checkCParams(params.cParams)));
|
|
assert(!((dict) && (cdict))); /* either dict or cdict, not both */
|
|
|
|
if (dict && dictSize >= 8) {
|
|
DEBUGLOG(4, "loading dictionary of size %u", (U32)dictSize);
|
|
if (zcs->staticSize) { /* static CCtx : never uses malloc */
|
|
/* incompatible with internal cdict creation */
|
|
return ERROR(memory_allocation);
|
|
}
|
|
ZSTD_freeCDict(zcs->cdictLocal);
|
|
zcs->cdictLocal = ZSTD_createCDict_advanced(dict, dictSize,
|
|
ZSTD_dlm_byCopy, ZSTD_dm_auto,
|
|
params.cParams, zcs->customMem);
|
|
zcs->cdict = zcs->cdictLocal;
|
|
if (zcs->cdictLocal == NULL) return ERROR(memory_allocation);
|
|
} else {
|
|
if (cdict) {
|
|
params.cParams = ZSTD_getCParamsFromCDict(cdict); /* cParams are enforced from cdict; it includes windowLog */
|
|
}
|
|
ZSTD_freeCDict(zcs->cdictLocal);
|
|
zcs->cdictLocal = NULL;
|
|
zcs->cdict = cdict;
|
|
}
|
|
|
|
params.compressionLevel = ZSTD_CLEVEL_CUSTOM; /* enforce usage of cParams, instead of a dynamic derivation from cLevel (but does that happen ?) */
|
|
zcs->requestedParams = params;
|
|
|
|
return ZSTD_resetCStream_internal(zcs, NULL, 0, ZSTD_dm_auto, zcs->cdict, params, pledgedSrcSize);
|
|
}
|
|
|
|
/* ZSTD_initCStream_usingCDict_advanced() :
|
|
* same as ZSTD_initCStream_usingCDict(), with control over frame parameters */
|
|
size_t ZSTD_initCStream_usingCDict_advanced(ZSTD_CStream* zcs,
|
|
const ZSTD_CDict* cdict,
|
|
ZSTD_frameParameters fParams,
|
|
unsigned long long pledgedSrcSize)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_initCStream_usingCDict_advanced");
|
|
if (!cdict) return ERROR(dictionary_wrong); /* cannot handle NULL cdict (does not know what to do) */
|
|
{ ZSTD_CCtx_params params = zcs->requestedParams;
|
|
params.cParams = ZSTD_getCParamsFromCDict(cdict);
|
|
params.fParams = fParams;
|
|
return ZSTD_initCStream_internal(zcs,
|
|
NULL, 0, cdict,
|
|
params, pledgedSrcSize);
|
|
}
|
|
}
|
|
|
|
/* note : cdict must outlive compression session */
|
|
size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict)
|
|
{
|
|
ZSTD_frameParameters const fParams = { 0 /* contentSizeFlag */, 0 /* checksum */, 0 /* hideDictID */ };
|
|
DEBUGLOG(4, "ZSTD_initCStream_usingCDict");
|
|
return ZSTD_initCStream_usingCDict_advanced(zcs, cdict, fParams, ZSTD_CONTENTSIZE_UNKNOWN); /* note : will check that cdict != NULL */
|
|
}
|
|
|
|
/* ZSTD_initCStream_advanced() :
|
|
* pledgedSrcSize must be correct.
|
|
* if srcSize is not known at init time, use value ZSTD_CONTENTSIZE_UNKNOWN.
|
|
* dict is loaded with default parameters ZSTD_dm_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 pledgedSrcSize)
|
|
{
|
|
ZSTD_CCtx_params const cctxParams = ZSTD_assignParamsToCCtxParams(zcs->requestedParams, params);
|
|
DEBUGLOG(4, "ZSTD_initCStream_advanced: pledgedSrcSize=%u, flag=%u",
|
|
(U32)pledgedSrcSize, params.fParams.contentSizeFlag);
|
|
CHECK_F( ZSTD_checkCParams(params.cParams) );
|
|
if ((pledgedSrcSize==0) && (params.fParams.contentSizeFlag==0)) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN; /* for compatibility with older programs relying on this behavior. Users should now specify ZSTD_CONTENTSIZE_UNKNOWN. This line will be removed in the future. */
|
|
return ZSTD_initCStream_internal(zcs, dict, dictSize, NULL /*cdict*/, cctxParams, pledgedSrcSize);
|
|
}
|
|
|
|
size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel)
|
|
{
|
|
ZSTD_parameters const params = ZSTD_getParams(compressionLevel, 0, dictSize);
|
|
ZSTD_CCtx_params const cctxParams =
|
|
ZSTD_assignParamsToCCtxParams(zcs->requestedParams, params);
|
|
return ZSTD_initCStream_internal(zcs, dict, dictSize, NULL, cctxParams, ZSTD_CONTENTSIZE_UNKNOWN);
|
|
}
|
|
|
|
size_t ZSTD_initCStream_srcSize(ZSTD_CStream* zcs, int compressionLevel, unsigned long long pss)
|
|
{
|
|
U64 const pledgedSrcSize = (pss==0) ? ZSTD_CONTENTSIZE_UNKNOWN : 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 */
|
|
ZSTD_parameters const params = ZSTD_getParams(compressionLevel, pledgedSrcSize, 0);
|
|
ZSTD_CCtx_params const cctxParams = ZSTD_assignParamsToCCtxParams(zcs->requestedParams, params);
|
|
return ZSTD_initCStream_internal(zcs, NULL, 0, NULL, cctxParams, pledgedSrcSize);
|
|
}
|
|
|
|
size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_initCStream");
|
|
return ZSTD_initCStream_srcSize(zcs, compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN);
|
|
}
|
|
|
|
/*====== Compression ======*/
|
|
|
|
MEM_STATIC size_t ZSTD_limitCopy(void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
size_t const length = MIN(dstCapacity, srcSize);
|
|
if (length) memcpy(dst, src, length);
|
|
return length;
|
|
}
|
|
|
|
/** ZSTD_compressStream_generic():
|
|
* internal function for all *compressStream*() variants and *compress_generic()
|
|
* non-static, because can be called from zstdmt.c
|
|
* @return : hint size for next input */
|
|
size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs,
|
|
ZSTD_outBuffer* output,
|
|
ZSTD_inBuffer* input,
|
|
ZSTD_EndDirective const flushMode)
|
|
{
|
|
const char* const istart = (const char*)input->src;
|
|
const char* const iend = istart + input->size;
|
|
const char* ip = istart + input->pos;
|
|
char* const ostart = (char*)output->dst;
|
|
char* const oend = ostart + output->size;
|
|
char* op = ostart + output->pos;
|
|
U32 someMoreWork = 1;
|
|
|
|
/* check expectations */
|
|
DEBUGLOG(5, "ZSTD_compressStream_generic, flush=%u", (U32)flushMode);
|
|
assert(zcs->inBuff != NULL);
|
|
assert(zcs->inBuffSize > 0);
|
|
assert(zcs->outBuff != NULL);
|
|
assert(zcs->outBuffSize > 0);
|
|
assert(output->pos <= output->size);
|
|
assert(input->pos <= input->size);
|
|
|
|
while (someMoreWork) {
|
|
switch(zcs->streamStage)
|
|
{
|
|
case zcss_init:
|
|
/* call ZSTD_initCStream() first ! */
|
|
return ERROR(init_missing);
|
|
|
|
case zcss_load:
|
|
if ( (flushMode == ZSTD_e_end)
|
|
&& ((size_t)(oend-op) >= ZSTD_compressBound(iend-ip)) /* enough dstCapacity */
|
|
&& (zcs->inBuffPos == 0) ) {
|
|
/* shortcut to compression pass directly into output buffer */
|
|
size_t const cSize = ZSTD_compressEnd(zcs,
|
|
op, oend-op, ip, iend-ip);
|
|
DEBUGLOG(4, "ZSTD_compressEnd : %u", (U32)cSize);
|
|
if (ZSTD_isError(cSize)) return cSize;
|
|
ip = iend;
|
|
op += cSize;
|
|
zcs->frameEnded = 1;
|
|
ZSTD_startNewCompression(zcs);
|
|
someMoreWork = 0; break;
|
|
}
|
|
/* complete loading into inBuffer */
|
|
{ size_t const toLoad = zcs->inBuffTarget - zcs->inBuffPos;
|
|
size_t const loaded = ZSTD_limitCopy(
|
|
zcs->inBuff + zcs->inBuffPos, toLoad,
|
|
ip, iend-ip);
|
|
zcs->inBuffPos += loaded;
|
|
ip += loaded;
|
|
if ( (flushMode == ZSTD_e_continue)
|
|
&& (zcs->inBuffPos < zcs->inBuffTarget) ) {
|
|
/* not enough input to fill full block : stop here */
|
|
someMoreWork = 0; break;
|
|
}
|
|
if ( (flushMode == ZSTD_e_flush)
|
|
&& (zcs->inBuffPos == zcs->inToCompress) ) {
|
|
/* empty */
|
|
someMoreWork = 0; break;
|
|
}
|
|
}
|
|
/* compress current block (note : this stage cannot be stopped in the middle) */
|
|
DEBUGLOG(5, "stream compression stage (flushMode==%u)", flushMode);
|
|
{ void* cDst;
|
|
size_t cSize;
|
|
size_t const iSize = zcs->inBuffPos - zcs->inToCompress;
|
|
size_t oSize = oend-op;
|
|
unsigned const lastBlock = (flushMode == ZSTD_e_end) && (ip==iend);
|
|
if (oSize >= ZSTD_compressBound(iSize))
|
|
cDst = op; /* compress into output buffer, to skip flush stage */
|
|
else
|
|
cDst = zcs->outBuff, oSize = zcs->outBuffSize;
|
|
cSize = lastBlock ?
|
|
ZSTD_compressEnd(zcs, cDst, oSize,
|
|
zcs->inBuff + zcs->inToCompress, iSize) :
|
|
ZSTD_compressContinue(zcs, cDst, oSize,
|
|
zcs->inBuff + zcs->inToCompress, iSize);
|
|
if (ZSTD_isError(cSize)) return cSize;
|
|
zcs->frameEnded = lastBlock;
|
|
/* prepare next block */
|
|
zcs->inBuffTarget = zcs->inBuffPos + zcs->blockSize;
|
|
if (zcs->inBuffTarget > zcs->inBuffSize)
|
|
zcs->inBuffPos = 0, zcs->inBuffTarget = zcs->blockSize;
|
|
DEBUGLOG(5, "inBuffTarget:%u / inBuffSize:%u",
|
|
(U32)zcs->inBuffTarget, (U32)zcs->inBuffSize);
|
|
if (!lastBlock)
|
|
assert(zcs->inBuffTarget <= zcs->inBuffSize);
|
|
zcs->inToCompress = zcs->inBuffPos;
|
|
if (cDst == op) { /* no need to flush */
|
|
op += cSize;
|
|
if (zcs->frameEnded) {
|
|
DEBUGLOG(5, "Frame completed directly in outBuffer");
|
|
someMoreWork = 0;
|
|
ZSTD_startNewCompression(zcs);
|
|
}
|
|
break;
|
|
}
|
|
zcs->outBuffContentSize = cSize;
|
|
zcs->outBuffFlushedSize = 0;
|
|
zcs->streamStage = zcss_flush; /* pass-through to flush stage */
|
|
}
|
|
/* fall-through */
|
|
case zcss_flush:
|
|
DEBUGLOG(5, "flush stage");
|
|
{ size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize;
|
|
size_t const flushed = ZSTD_limitCopy(op, oend-op,
|
|
zcs->outBuff + zcs->outBuffFlushedSize, toFlush);
|
|
DEBUGLOG(5, "toFlush: %u into %u ==> flushed: %u",
|
|
(U32)toFlush, (U32)(oend-op), (U32)flushed);
|
|
op += flushed;
|
|
zcs->outBuffFlushedSize += flushed;
|
|
if (toFlush!=flushed) {
|
|
/* flush not fully completed, presumably because dst is too small */
|
|
assert(op==oend);
|
|
someMoreWork = 0;
|
|
break;
|
|
}
|
|
zcs->outBuffContentSize = zcs->outBuffFlushedSize = 0;
|
|
if (zcs->frameEnded) {
|
|
DEBUGLOG(5, "Frame completed on flush");
|
|
someMoreWork = 0;
|
|
ZSTD_startNewCompression(zcs);
|
|
break;
|
|
}
|
|
zcs->streamStage = zcss_load;
|
|
break;
|
|
}
|
|
|
|
default: /* impossible */
|
|
assert(0);
|
|
}
|
|
}
|
|
|
|
input->pos = ip - istart;
|
|
output->pos = op - ostart;
|
|
if (zcs->frameEnded) return 0;
|
|
{ size_t hintInSize = zcs->inBuffTarget - zcs->inBuffPos;
|
|
if (hintInSize==0) hintInSize = zcs->blockSize;
|
|
return hintInSize;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_compressStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
|
|
{
|
|
/* check conditions */
|
|
if (output->pos > output->size) return ERROR(GENERIC);
|
|
if (input->pos > input->size) return ERROR(GENERIC);
|
|
|
|
return ZSTD_compressStream_generic(zcs, output, input, ZSTD_e_continue);
|
|
}
|
|
|
|
|
|
size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
|
|
ZSTD_outBuffer* output,
|
|
ZSTD_inBuffer* input,
|
|
ZSTD_EndDirective endOp)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_compress_generic, endOp=%u ", (U32)endOp);
|
|
/* check conditions */
|
|
if (output->pos > output->size) return ERROR(GENERIC);
|
|
if (input->pos > input->size) return ERROR(GENERIC);
|
|
assert(cctx!=NULL);
|
|
|
|
/* transparent initialization stage */
|
|
if (cctx->streamStage == zcss_init) {
|
|
ZSTD_CCtx_params params = cctx->requestedParams;
|
|
ZSTD_prefixDict const prefixDict = cctx->prefixDict;
|
|
memset(&cctx->prefixDict, 0, sizeof(cctx->prefixDict)); /* single usage */
|
|
assert(prefixDict.dict==NULL || cctx->cdict==NULL); /* only one can be set */
|
|
DEBUGLOG(4, "ZSTD_compress_generic : transparent init stage");
|
|
if (endOp == ZSTD_e_end) cctx->pledgedSrcSizePlusOne = input->size + 1; /* auto-fix pledgedSrcSize */
|
|
params.cParams = ZSTD_getCParamsFromCCtxParams(
|
|
cctx->requestedParams, cctx->pledgedSrcSizePlusOne-1, 0 /*dictSize*/);
|
|
|
|
#ifdef ZSTD_MULTITHREAD
|
|
if ((cctx->pledgedSrcSizePlusOne-1) <= ZSTDMT_JOBSIZE_MIN) {
|
|
params.nbWorkers = 0; /* do not invoke multi-threading when src size is too small */
|
|
}
|
|
if (params.nbWorkers > 0) {
|
|
if (cctx->mtctx == NULL || (params.nbWorkers != ZSTDMT_getNbWorkers(cctx->mtctx))) {
|
|
DEBUGLOG(4, "ZSTD_compress_generic: creating new mtctx for nbWorkers=%u",
|
|
params.nbWorkers);
|
|
if (cctx->mtctx != NULL)
|
|
DEBUGLOG(4, "ZSTD_compress_generic: previous nbWorkers was %u",
|
|
ZSTDMT_getNbWorkers(cctx->mtctx));
|
|
ZSTDMT_freeCCtx(cctx->mtctx);
|
|
cctx->mtctx = ZSTDMT_createCCtx_advanced(params.nbWorkers, cctx->customMem);
|
|
if (cctx->mtctx == NULL) return ERROR(memory_allocation);
|
|
}
|
|
DEBUGLOG(4, "call ZSTDMT_initCStream_internal as nbWorkers=%u", params.nbWorkers);
|
|
CHECK_F( ZSTDMT_initCStream_internal(
|
|
cctx->mtctx,
|
|
prefixDict.dict, prefixDict.dictSize, ZSTD_dm_rawContent,
|
|
cctx->cdict, params, cctx->pledgedSrcSizePlusOne-1) );
|
|
cctx->streamStage = zcss_load;
|
|
cctx->appliedParams.nbWorkers = params.nbWorkers;
|
|
} else
|
|
#endif
|
|
{ CHECK_F( ZSTD_resetCStream_internal(
|
|
cctx, prefixDict.dict, prefixDict.dictSize,
|
|
prefixDict.dictMode, cctx->cdict, params,
|
|
cctx->pledgedSrcSizePlusOne-1) );
|
|
assert(cctx->streamStage == zcss_load);
|
|
assert(cctx->appliedParams.nbWorkers == 0);
|
|
} }
|
|
|
|
/* compression stage */
|
|
#ifdef ZSTD_MULTITHREAD
|
|
if (cctx->appliedParams.nbWorkers > 0) {
|
|
size_t const flushMin = ZSTDMT_compressStream_generic(cctx->mtctx, output, input, endOp);
|
|
if ( ZSTD_isError(flushMin)
|
|
|| (endOp == ZSTD_e_end && flushMin == 0) ) { /* compression completed */
|
|
ZSTD_startNewCompression(cctx);
|
|
}
|
|
return flushMin;
|
|
}
|
|
#endif
|
|
CHECK_F( ZSTD_compressStream_generic(cctx, output, input, endOp) );
|
|
DEBUGLOG(5, "completed ZSTD_compress_generic");
|
|
return cctx->outBuffContentSize - cctx->outBuffFlushedSize; /* remaining to flush */
|
|
}
|
|
|
|
size_t ZSTD_compress_generic_simpleArgs (
|
|
ZSTD_CCtx* cctx,
|
|
void* dst, size_t dstCapacity, size_t* dstPos,
|
|
const void* src, size_t srcSize, size_t* srcPos,
|
|
ZSTD_EndDirective endOp)
|
|
{
|
|
ZSTD_outBuffer output = { dst, dstCapacity, *dstPos };
|
|
ZSTD_inBuffer input = { src, srcSize, *srcPos };
|
|
/* ZSTD_compress_generic() will check validity of dstPos and srcPos */
|
|
size_t const cErr = ZSTD_compress_generic(cctx, &output, &input, endOp);
|
|
*dstPos = output.pos;
|
|
*srcPos = input.pos;
|
|
return cErr;
|
|
}
|
|
|
|
|
|
/*====== Finalize ======*/
|
|
|
|
/*! ZSTD_flushStream() :
|
|
* @return : amount of data remaining to flush */
|
|
size_t ZSTD_flushStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
|
|
{
|
|
ZSTD_inBuffer input = { NULL, 0, 0 };
|
|
if (output->pos > output->size) return ERROR(GENERIC);
|
|
CHECK_F( ZSTD_compressStream_generic(zcs, output, &input, ZSTD_e_flush) );
|
|
return zcs->outBuffContentSize - zcs->outBuffFlushedSize; /* remaining to flush */
|
|
}
|
|
|
|
|
|
size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
|
|
{
|
|
ZSTD_inBuffer input = { NULL, 0, 0 };
|
|
if (output->pos > output->size) return ERROR(GENERIC);
|
|
CHECK_F( ZSTD_compressStream_generic(zcs, output, &input, ZSTD_e_end) );
|
|
{ size_t const lastBlockSize = zcs->frameEnded ? 0 : ZSTD_BLOCKHEADERSIZE;
|
|
size_t const checksumSize = zcs->frameEnded ? 0 : zcs->appliedParams.fParams.checksumFlag * 4;
|
|
size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize + lastBlockSize + checksumSize;
|
|
DEBUGLOG(4, "ZSTD_endStream : remaining to flush : %u", (U32)toFlush);
|
|
return toFlush;
|
|
}
|
|
}
|
|
|
|
|
|
/*-===== Pre-defined compression levels =====-*/
|
|
|
|
#define ZSTD_MAX_CLEVEL 22
|
|
int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }
|
|
|
|
static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEVEL+1] = {
|
|
{ /* "default" - guarantees a monotonically increasing memory budget */
|
|
/* W, C, H, S, L, TL, strat */
|
|
{ 18, 12, 12, 1, 7, 16, ZSTD_fast }, /* level 0 - never used */
|
|
{ 19, 13, 14, 1, 7, 16, ZSTD_fast }, /* level 1 */
|
|
{ 19, 15, 16, 1, 6, 16, ZSTD_fast }, /* level 2 */
|
|
{ 20, 16, 17, 1, 5, 16, ZSTD_dfast }, /* level 3 */
|
|
{ 20, 17, 18, 1, 5, 16, ZSTD_dfast }, /* level 4 */
|
|
{ 20, 17, 18, 2, 5, 16, ZSTD_greedy }, /* level 5 */
|
|
{ 21, 17, 19, 2, 5, 16, ZSTD_lazy }, /* level 6 */
|
|
{ 21, 18, 19, 3, 5, 16, ZSTD_lazy }, /* level 7 */
|
|
{ 21, 18, 20, 3, 5, 16, ZSTD_lazy2 }, /* level 8 */
|
|
{ 21, 19, 20, 3, 5, 16, ZSTD_lazy2 }, /* level 9 */
|
|
{ 21, 19, 21, 4, 5, 16, ZSTD_lazy2 }, /* level 10 */
|
|
{ 22, 20, 22, 4, 5, 16, ZSTD_lazy2 }, /* level 11 */
|
|
{ 22, 20, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 12 */
|
|
{ 22, 21, 22, 4, 5, 16, ZSTD_btlazy2 }, /* level 13 */
|
|
{ 22, 21, 22, 5, 5, 16, ZSTD_btlazy2 }, /* level 14 */
|
|
{ 22, 22, 22, 6, 5, 16, ZSTD_btlazy2 }, /* level 15 */
|
|
{ 22, 21, 22, 4, 5, 48, ZSTD_btopt }, /* level 16 */
|
|
{ 23, 22, 22, 4, 4, 48, ZSTD_btopt }, /* level 17 */
|
|
{ 23, 22, 22, 5, 3, 64, ZSTD_btopt }, /* level 18 */
|
|
{ 23, 23, 22, 7, 3,128, ZSTD_btopt }, /* level 19 */
|
|
{ 25, 25, 23, 7, 3,128, ZSTD_btultra }, /* level 20 */
|
|
{ 26, 26, 24, 7, 3,256, ZSTD_btultra }, /* level 21 */
|
|
{ 27, 27, 25, 9, 3,512, ZSTD_btultra }, /* level 22 */
|
|
},
|
|
{ /* for srcSize <= 256 KB */
|
|
/* W, C, H, S, L, T, strat */
|
|
{ 0, 0, 0, 0, 0, 0, ZSTD_fast }, /* level 0 - not used */
|
|
{ 18, 13, 14, 1, 6, 8, ZSTD_fast }, /* level 1 */
|
|
{ 18, 14, 13, 1, 5, 8, ZSTD_dfast }, /* level 2 */
|
|
{ 18, 16, 15, 1, 5, 8, ZSTD_dfast }, /* level 3 */
|
|
{ 18, 15, 17, 1, 5, 8, ZSTD_greedy }, /* level 4.*/
|
|
{ 18, 16, 17, 4, 5, 8, ZSTD_greedy }, /* level 5.*/
|
|
{ 18, 16, 17, 3, 5, 8, ZSTD_lazy }, /* level 6.*/
|
|
{ 18, 17, 17, 4, 4, 8, ZSTD_lazy }, /* level 7 */
|
|
{ 18, 17, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */
|
|
{ 18, 17, 17, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */
|
|
{ 18, 17, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */
|
|
{ 18, 18, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 11.*/
|
|
{ 18, 18, 17, 7, 4, 8, ZSTD_lazy2 }, /* level 12.*/
|
|
{ 18, 19, 17, 6, 4, 8, ZSTD_btlazy2 }, /* level 13 */
|
|
{ 18, 18, 18, 4, 4, 16, ZSTD_btopt }, /* level 14.*/
|
|
{ 18, 18, 18, 4, 3, 16, ZSTD_btopt }, /* level 15.*/
|
|
{ 18, 19, 18, 6, 3, 32, ZSTD_btopt }, /* level 16.*/
|
|
{ 18, 19, 18, 8, 3, 64, ZSTD_btopt }, /* level 17.*/
|
|
{ 18, 19, 18, 9, 3,128, ZSTD_btopt }, /* level 18.*/
|
|
{ 18, 19, 18, 10, 3,256, ZSTD_btopt }, /* level 19.*/
|
|
{ 18, 19, 18, 11, 3,512, ZSTD_btultra }, /* level 20.*/
|
|
{ 18, 19, 18, 12, 3,512, ZSTD_btultra }, /* level 21.*/
|
|
{ 18, 19, 18, 13, 3,512, ZSTD_btultra }, /* level 22.*/
|
|
},
|
|
{ /* for srcSize <= 128 KB */
|
|
/* W, C, H, S, L, T, strat */
|
|
{ 17, 12, 12, 1, 7, 8, ZSTD_fast }, /* level 0 - not used */
|
|
{ 17, 12, 13, 1, 6, 8, ZSTD_fast }, /* level 1 */
|
|
{ 17, 13, 16, 1, 5, 8, ZSTD_fast }, /* level 2 */
|
|
{ 17, 16, 16, 2, 5, 8, ZSTD_dfast }, /* level 3 */
|
|
{ 17, 13, 15, 3, 4, 8, ZSTD_greedy }, /* level 4 */
|
|
{ 17, 15, 17, 4, 4, 8, ZSTD_greedy }, /* level 5 */
|
|
{ 17, 16, 17, 3, 4, 8, ZSTD_lazy }, /* level 6 */
|
|
{ 17, 15, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 7 */
|
|
{ 17, 17, 17, 4, 4, 8, ZSTD_lazy2 }, /* level 8 */
|
|
{ 17, 17, 17, 5, 4, 8, ZSTD_lazy2 }, /* level 9 */
|
|
{ 17, 17, 17, 6, 4, 8, ZSTD_lazy2 }, /* level 10 */
|
|
{ 17, 17, 17, 7, 4, 8, ZSTD_lazy2 }, /* level 11 */
|
|
{ 17, 17, 17, 8, 4, 8, ZSTD_lazy2 }, /* level 12 */
|
|
{ 17, 18, 17, 6, 4, 8, ZSTD_btlazy2 }, /* level 13.*/
|
|
{ 17, 17, 17, 7, 3, 8, ZSTD_btopt }, /* level 14.*/
|
|
{ 17, 17, 17, 7, 3, 16, ZSTD_btopt }, /* level 15.*/
|
|
{ 17, 18, 17, 7, 3, 32, ZSTD_btopt }, /* level 16.*/
|
|
{ 17, 18, 17, 7, 3, 64, ZSTD_btopt }, /* level 17.*/
|
|
{ 17, 18, 17, 7, 3,256, ZSTD_btopt }, /* level 18.*/
|
|
{ 17, 18, 17, 8, 3,256, ZSTD_btopt }, /* level 19.*/
|
|
{ 17, 18, 17, 9, 3,256, ZSTD_btultra }, /* level 20.*/
|
|
{ 17, 18, 17, 10, 3,256, ZSTD_btultra }, /* level 21.*/
|
|
{ 17, 18, 17, 11, 3,512, ZSTD_btultra }, /* level 22.*/
|
|
},
|
|
{ /* for srcSize <= 16 KB */
|
|
/* W, C, H, S, L, T, strat */
|
|
{ 14, 12, 12, 1, 7, 6, ZSTD_fast }, /* level 0 - not used */
|
|
{ 14, 14, 14, 1, 6, 6, ZSTD_fast }, /* level 1 */
|
|
{ 14, 14, 14, 1, 4, 6, ZSTD_fast }, /* level 2 */
|
|
{ 14, 14, 14, 1, 4, 6, ZSTD_dfast }, /* level 3.*/
|
|
{ 14, 14, 14, 4, 4, 6, ZSTD_greedy }, /* level 4.*/
|
|
{ 14, 14, 14, 3, 4, 6, ZSTD_lazy }, /* level 5.*/
|
|
{ 14, 14, 14, 4, 4, 6, ZSTD_lazy2 }, /* level 6 */
|
|
{ 14, 14, 14, 5, 4, 6, ZSTD_lazy2 }, /* level 7 */
|
|
{ 14, 14, 14, 6, 4, 6, ZSTD_lazy2 }, /* level 8.*/
|
|
{ 14, 15, 14, 6, 4, 6, ZSTD_btlazy2 }, /* level 9.*/
|
|
{ 14, 15, 14, 3, 3, 6, ZSTD_btopt }, /* level 10.*/
|
|
{ 14, 15, 14, 6, 3, 8, ZSTD_btopt }, /* level 11.*/
|
|
{ 14, 15, 14, 6, 3, 16, ZSTD_btopt }, /* level 12.*/
|
|
{ 14, 15, 14, 6, 3, 24, ZSTD_btopt }, /* level 13.*/
|
|
{ 14, 15, 15, 6, 3, 48, ZSTD_btopt }, /* level 14.*/
|
|
{ 14, 15, 15, 6, 3, 64, ZSTD_btopt }, /* level 15.*/
|
|
{ 14, 15, 15, 6, 3, 96, ZSTD_btopt }, /* level 16.*/
|
|
{ 14, 15, 15, 6, 3,128, ZSTD_btopt }, /* level 17.*/
|
|
{ 14, 15, 15, 6, 3,256, ZSTD_btopt }, /* level 18.*/
|
|
{ 14, 15, 15, 7, 3,256, ZSTD_btopt }, /* level 19.*/
|
|
{ 14, 15, 15, 8, 3,256, ZSTD_btultra }, /* level 20.*/
|
|
{ 14, 15, 15, 9, 3,256, ZSTD_btultra }, /* level 21.*/
|
|
{ 14, 15, 15, 10, 3,256, ZSTD_btultra }, /* level 22.*/
|
|
},
|
|
};
|
|
|
|
/*! ZSTD_getCParams() :
|
|
* @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize.
|
|
* Size values are optional, provide 0 if not known or unused */
|
|
ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize)
|
|
{
|
|
size_t const addedSize = srcSizeHint ? 0 : 500;
|
|
U64 const rSize = srcSizeHint+dictSize ? srcSizeHint+dictSize+addedSize : (U64)-1;
|
|
U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB); /* intentional underflow for srcSizeHint == 0 */
|
|
DEBUGLOG(4, "ZSTD_getCParams: cLevel=%i, srcSize=%u, dictSize=%u => table %u",
|
|
compressionLevel, (U32)srcSizeHint, (U32)dictSize, tableID);
|
|
if (compressionLevel <= 0) compressionLevel = ZSTD_CLEVEL_DEFAULT; /* 0 == default; no negative compressionLevel yet */
|
|
if (compressionLevel > ZSTD_MAX_CLEVEL) compressionLevel = ZSTD_MAX_CLEVEL;
|
|
{ ZSTD_compressionParameters const cp = ZSTD_defaultCParameters[tableID][compressionLevel];
|
|
return ZSTD_adjustCParams_internal(cp, srcSizeHint, dictSize); }
|
|
|
|
}
|
|
|
|
/*! ZSTD_getParams() :
|
|
* same as ZSTD_getCParams(), but @return a `ZSTD_parameters` object (instead of `ZSTD_compressionParameters`).
|
|
* All fields of `ZSTD_frameParameters` are set to default (0) */
|
|
ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize) {
|
|
ZSTD_parameters params;
|
|
ZSTD_compressionParameters const cParams = ZSTD_getCParams(compressionLevel, srcSizeHint, dictSize);
|
|
memset(¶ms, 0, sizeof(params));
|
|
params.cParams = cParams;
|
|
params.fParams.contentSizeFlag = 1;
|
|
return params;
|
|
}
|