1768 lines
71 KiB
C
1768 lines
71 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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/*!
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* HEAPMODE :
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* Select how default decompression function ZSTD_decompress() allocates its context,
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* on stack (0), or into heap (1, default; requires malloc()).
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* Note that functions with explicit context such as ZSTD_decompressDCtx() are unaffected.
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*/
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#ifndef ZSTD_HEAPMODE
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# define ZSTD_HEAPMODE 1
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#endif
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/*!
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* LEGACY_SUPPORT :
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* if set to 1+, ZSTD_decompress() can decode older formats (v0.1+)
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*/
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#ifndef ZSTD_LEGACY_SUPPORT
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# define ZSTD_LEGACY_SUPPORT 0
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#endif
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/*!
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* MAXWINDOWSIZE_DEFAULT :
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* maximum window size accepted by DStream __by default__.
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* Frames requiring more memory will be rejected.
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* It's possible to set a different limit using ZSTD_DCtx_setMaxWindowSize().
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*/
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#ifndef ZSTD_MAXWINDOWSIZE_DEFAULT
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# define ZSTD_MAXWINDOWSIZE_DEFAULT (((U32)1 << ZSTD_WINDOWLOG_LIMIT_DEFAULT) + 1)
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#endif
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/*!
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* NO_FORWARD_PROGRESS_MAX :
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* maximum allowed nb of calls to ZSTD_decompressStream()
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* without any forward progress
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* (defined as: no byte read from input, and no byte flushed to output)
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* before triggering an error.
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*/
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#ifndef ZSTD_NO_FORWARD_PROGRESS_MAX
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# define ZSTD_NO_FORWARD_PROGRESS_MAX 16
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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> /* memcpy, memmove, memset */
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#include "cpu.h" /* bmi2 */
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#include "mem.h" /* low level memory routines */
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#define FSE_STATIC_LINKING_ONLY
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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_internal.h" /* blockProperties_t */
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#include "zstd_decompress_internal.h" /* ZSTD_DCtx */
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#include "zstd_ddict.h" /* ZSTD_DDictDictContent */
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#include "zstd_decompress_block.h" /* ZSTD_decompressBlock_internal */
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#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
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# include "zstd_legacy.h"
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#endif
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/*-*************************************************************
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* Context management
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***************************************************************/
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size_t ZSTD_sizeof_DCtx (const ZSTD_DCtx* dctx)
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{
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if (dctx==NULL) return 0; /* support sizeof NULL */
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return sizeof(*dctx)
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+ ZSTD_sizeof_DDict(dctx->ddictLocal)
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+ dctx->inBuffSize + dctx->outBuffSize;
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}
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size_t ZSTD_estimateDCtxSize(void) { return sizeof(ZSTD_DCtx); }
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static size_t ZSTD_startingInputLength(ZSTD_format_e format)
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{
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size_t const startingInputLength = (format==ZSTD_f_zstd1_magicless) ?
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ZSTD_FRAMEHEADERSIZE_PREFIX - ZSTD_FRAMEIDSIZE :
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ZSTD_FRAMEHEADERSIZE_PREFIX;
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ZSTD_STATIC_ASSERT(ZSTD_FRAMEHEADERSIZE_PREFIX >= ZSTD_FRAMEIDSIZE);
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/* only supports formats ZSTD_f_zstd1 and ZSTD_f_zstd1_magicless */
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assert( (format == ZSTD_f_zstd1) || (format == ZSTD_f_zstd1_magicless) );
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return startingInputLength;
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}
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static void ZSTD_initDCtx_internal(ZSTD_DCtx* dctx)
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{
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dctx->format = ZSTD_f_zstd1; /* ZSTD_decompressBegin() invokes ZSTD_startingInputLength() with argument dctx->format */
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dctx->staticSize = 0;
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dctx->maxWindowSize = ZSTD_MAXWINDOWSIZE_DEFAULT;
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dctx->ddict = NULL;
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dctx->ddictLocal = NULL;
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dctx->dictEnd = NULL;
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dctx->ddictIsCold = 0;
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dctx->dictUses = ZSTD_dont_use;
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dctx->inBuff = NULL;
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dctx->inBuffSize = 0;
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dctx->outBuffSize = 0;
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dctx->streamStage = zdss_init;
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dctx->legacyContext = NULL;
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dctx->previousLegacyVersion = 0;
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dctx->noForwardProgress = 0;
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dctx->bmi2 = ZSTD_cpuid_bmi2(ZSTD_cpuid());
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}
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ZSTD_DCtx* ZSTD_initStaticDCtx(void *workspace, size_t workspaceSize)
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{
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ZSTD_DCtx* const dctx = (ZSTD_DCtx*) workspace;
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if ((size_t)workspace & 7) return NULL; /* 8-aligned */
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if (workspaceSize < sizeof(ZSTD_DCtx)) return NULL; /* minimum size */
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ZSTD_initDCtx_internal(dctx);
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dctx->staticSize = workspaceSize;
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dctx->inBuff = (char*)(dctx+1);
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return dctx;
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}
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ZSTD_DCtx* ZSTD_createDCtx_advanced(ZSTD_customMem customMem)
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{
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if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
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{ ZSTD_DCtx* const dctx = (ZSTD_DCtx*)ZSTD_malloc(sizeof(*dctx), customMem);
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if (!dctx) return NULL;
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dctx->customMem = customMem;
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ZSTD_initDCtx_internal(dctx);
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return dctx;
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}
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}
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ZSTD_DCtx* ZSTD_createDCtx(void)
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{
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DEBUGLOG(3, "ZSTD_createDCtx");
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return ZSTD_createDCtx_advanced(ZSTD_defaultCMem);
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}
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static void ZSTD_clearDict(ZSTD_DCtx* dctx)
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{
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ZSTD_freeDDict(dctx->ddictLocal);
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dctx->ddictLocal = NULL;
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dctx->ddict = NULL;
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dctx->dictUses = ZSTD_dont_use;
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}
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size_t ZSTD_freeDCtx(ZSTD_DCtx* dctx)
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{
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if (dctx==NULL) return 0; /* support free on NULL */
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RETURN_ERROR_IF(dctx->staticSize, memory_allocation, "not compatible with static DCtx");
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{ ZSTD_customMem const cMem = dctx->customMem;
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ZSTD_clearDict(dctx);
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ZSTD_free(dctx->inBuff, cMem);
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dctx->inBuff = NULL;
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#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
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if (dctx->legacyContext)
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ZSTD_freeLegacyStreamContext(dctx->legacyContext, dctx->previousLegacyVersion);
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#endif
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ZSTD_free(dctx, cMem);
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return 0;
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}
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}
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/* no longer useful */
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void ZSTD_copyDCtx(ZSTD_DCtx* dstDCtx, const ZSTD_DCtx* srcDCtx)
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{
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size_t const toCopy = (size_t)((char*)(&dstDCtx->inBuff) - (char*)dstDCtx);
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memcpy(dstDCtx, srcDCtx, toCopy); /* no need to copy workspace */
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}
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/*-*************************************************************
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* Frame header decoding
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***************************************************************/
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/*! ZSTD_isFrame() :
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* Tells if the content of `buffer` starts with a valid Frame Identifier.
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* Note : Frame Identifier is 4 bytes. If `size < 4`, @return will always be 0.
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* Note 2 : Legacy Frame Identifiers are considered valid only if Legacy Support is enabled.
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* Note 3 : Skippable Frame Identifiers are considered valid. */
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unsigned ZSTD_isFrame(const void* buffer, size_t size)
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{
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if (size < ZSTD_FRAMEIDSIZE) return 0;
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{ U32 const magic = MEM_readLE32(buffer);
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if (magic == ZSTD_MAGICNUMBER) return 1;
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if ((magic & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) return 1;
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}
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#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
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if (ZSTD_isLegacy(buffer, size)) return 1;
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#endif
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return 0;
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}
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/** ZSTD_frameHeaderSize_internal() :
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* srcSize must be large enough to reach header size fields.
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* note : only works for formats ZSTD_f_zstd1 and ZSTD_f_zstd1_magicless.
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* @return : size of the Frame Header
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* or an error code, which can be tested with ZSTD_isError() */
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static size_t ZSTD_frameHeaderSize_internal(const void* src, size_t srcSize, ZSTD_format_e format)
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{
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size_t const minInputSize = ZSTD_startingInputLength(format);
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RETURN_ERROR_IF(srcSize < minInputSize, srcSize_wrong);
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{ BYTE const fhd = ((const BYTE*)src)[minInputSize-1];
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U32 const dictID= fhd & 3;
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U32 const singleSegment = (fhd >> 5) & 1;
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U32 const fcsId = fhd >> 6;
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return minInputSize + !singleSegment
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+ ZSTD_did_fieldSize[dictID] + ZSTD_fcs_fieldSize[fcsId]
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+ (singleSegment && !fcsId);
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}
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}
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/** ZSTD_frameHeaderSize() :
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* srcSize must be >= ZSTD_frameHeaderSize_prefix.
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* @return : size of the Frame Header,
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* or an error code (if srcSize is too small) */
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size_t ZSTD_frameHeaderSize(const void* src, size_t srcSize)
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{
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return ZSTD_frameHeaderSize_internal(src, srcSize, ZSTD_f_zstd1);
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}
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/** ZSTD_getFrameHeader_advanced() :
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* decode Frame Header, or require larger `srcSize`.
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* note : only works for formats ZSTD_f_zstd1 and ZSTD_f_zstd1_magicless
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* @return : 0, `zfhPtr` is correctly filled,
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* >0, `srcSize` is too small, value is wanted `srcSize` amount,
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* or an error code, which can be tested using ZSTD_isError() */
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size_t ZSTD_getFrameHeader_advanced(ZSTD_frameHeader* zfhPtr, const void* src, size_t srcSize, ZSTD_format_e format)
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{
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const BYTE* ip = (const BYTE*)src;
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size_t const minInputSize = ZSTD_startingInputLength(format);
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memset(zfhPtr, 0, sizeof(*zfhPtr)); /* not strictly necessary, but static analyzer do not understand that zfhPtr is only going to be read only if return value is zero, since they are 2 different signals */
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if (srcSize < minInputSize) return minInputSize;
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RETURN_ERROR_IF(src==NULL, GENERIC, "invalid parameter");
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if ( (format != ZSTD_f_zstd1_magicless)
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&& (MEM_readLE32(src) != ZSTD_MAGICNUMBER) ) {
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if ((MEM_readLE32(src) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) {
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/* skippable frame */
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if (srcSize < ZSTD_SKIPPABLEHEADERSIZE)
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return ZSTD_SKIPPABLEHEADERSIZE; /* magic number + frame length */
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memset(zfhPtr, 0, sizeof(*zfhPtr));
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zfhPtr->frameContentSize = MEM_readLE32((const char *)src + ZSTD_FRAMEIDSIZE);
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zfhPtr->frameType = ZSTD_skippableFrame;
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return 0;
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}
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RETURN_ERROR(prefix_unknown);
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}
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/* ensure there is enough `srcSize` to fully read/decode frame header */
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{ size_t const fhsize = ZSTD_frameHeaderSize_internal(src, srcSize, format);
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if (srcSize < fhsize) return fhsize;
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zfhPtr->headerSize = (U32)fhsize;
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}
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{ BYTE const fhdByte = ip[minInputSize-1];
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size_t pos = minInputSize;
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U32 const dictIDSizeCode = fhdByte&3;
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U32 const checksumFlag = (fhdByte>>2)&1;
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U32 const singleSegment = (fhdByte>>5)&1;
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U32 const fcsID = fhdByte>>6;
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U64 windowSize = 0;
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U32 dictID = 0;
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U64 frameContentSize = ZSTD_CONTENTSIZE_UNKNOWN;
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RETURN_ERROR_IF((fhdByte & 0x08) != 0, frameParameter_unsupported,
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"reserved bits, must be zero");
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if (!singleSegment) {
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BYTE const wlByte = ip[pos++];
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U32 const windowLog = (wlByte >> 3) + ZSTD_WINDOWLOG_ABSOLUTEMIN;
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RETURN_ERROR_IF(windowLog > ZSTD_WINDOWLOG_MAX, frameParameter_windowTooLarge);
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windowSize = (1ULL << windowLog);
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windowSize += (windowSize >> 3) * (wlByte&7);
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}
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switch(dictIDSizeCode)
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{
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default: assert(0); /* impossible */
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case 0 : break;
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case 1 : dictID = ip[pos]; pos++; break;
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case 2 : dictID = MEM_readLE16(ip+pos); pos+=2; break;
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case 3 : dictID = MEM_readLE32(ip+pos); pos+=4; break;
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}
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switch(fcsID)
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{
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default: assert(0); /* impossible */
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case 0 : if (singleSegment) frameContentSize = ip[pos]; break;
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case 1 : frameContentSize = MEM_readLE16(ip+pos)+256; break;
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case 2 : frameContentSize = MEM_readLE32(ip+pos); break;
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case 3 : frameContentSize = MEM_readLE64(ip+pos); break;
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}
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if (singleSegment) windowSize = frameContentSize;
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zfhPtr->frameType = ZSTD_frame;
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zfhPtr->frameContentSize = frameContentSize;
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zfhPtr->windowSize = windowSize;
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zfhPtr->blockSizeMax = (unsigned) MIN(windowSize, ZSTD_BLOCKSIZE_MAX);
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zfhPtr->dictID = dictID;
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zfhPtr->checksumFlag = checksumFlag;
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}
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return 0;
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}
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/** ZSTD_getFrameHeader() :
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* decode Frame Header, or require larger `srcSize`.
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* note : this function does not consume input, it only reads it.
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* @return : 0, `zfhPtr` is correctly filled,
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* >0, `srcSize` is too small, value is wanted `srcSize` amount,
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* or an error code, which can be tested using ZSTD_isError() */
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size_t ZSTD_getFrameHeader(ZSTD_frameHeader* zfhPtr, const void* src, size_t srcSize)
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{
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return ZSTD_getFrameHeader_advanced(zfhPtr, src, srcSize, ZSTD_f_zstd1);
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}
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/** ZSTD_getFrameContentSize() :
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* compatible with legacy mode
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* @return : decompressed size of the single frame pointed to be `src` if known, otherwise
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* - ZSTD_CONTENTSIZE_UNKNOWN if the size cannot be determined
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* - ZSTD_CONTENTSIZE_ERROR if an error occurred (e.g. invalid magic number, srcSize too small) */
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unsigned long long ZSTD_getFrameContentSize(const void *src, size_t srcSize)
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{
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#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
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if (ZSTD_isLegacy(src, srcSize)) {
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unsigned long long const ret = ZSTD_getDecompressedSize_legacy(src, srcSize);
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return ret == 0 ? ZSTD_CONTENTSIZE_UNKNOWN : ret;
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}
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#endif
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{ ZSTD_frameHeader zfh;
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if (ZSTD_getFrameHeader(&zfh, src, srcSize) != 0)
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return ZSTD_CONTENTSIZE_ERROR;
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if (zfh.frameType == ZSTD_skippableFrame) {
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return 0;
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} else {
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return zfh.frameContentSize;
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} }
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}
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static size_t readSkippableFrameSize(void const* src, size_t srcSize)
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{
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size_t const skippableHeaderSize = ZSTD_SKIPPABLEHEADERSIZE;
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U32 sizeU32;
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RETURN_ERROR_IF(srcSize < ZSTD_SKIPPABLEHEADERSIZE, srcSize_wrong);
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sizeU32 = MEM_readLE32((BYTE const*)src + ZSTD_FRAMEIDSIZE);
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RETURN_ERROR_IF((U32)(sizeU32 + ZSTD_SKIPPABLEHEADERSIZE) < sizeU32,
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frameParameter_unsupported);
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{
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size_t const skippableSize = skippableHeaderSize + sizeU32;
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RETURN_ERROR_IF(skippableSize > srcSize, srcSize_wrong);
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return skippableSize;
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}
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}
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/** ZSTD_findDecompressedSize() :
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* compatible with legacy mode
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* `srcSize` must be the exact length of some number of ZSTD compressed and/or
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* skippable frames
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* @return : decompressed size of the frames contained */
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unsigned long long ZSTD_findDecompressedSize(const void* src, size_t srcSize)
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{
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unsigned long long totalDstSize = 0;
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while (srcSize >= ZSTD_FRAMEHEADERSIZE_PREFIX) {
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U32 const magicNumber = MEM_readLE32(src);
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if ((magicNumber & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) {
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size_t const skippableSize = readSkippableFrameSize(src, srcSize);
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if (ZSTD_isError(skippableSize)) {
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return ZSTD_CONTENTSIZE_ERROR;
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}
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assert(skippableSize <= srcSize);
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src = (const BYTE *)src + skippableSize;
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srcSize -= skippableSize;
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continue;
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}
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{ unsigned long long const ret = ZSTD_getFrameContentSize(src, srcSize);
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if (ret >= ZSTD_CONTENTSIZE_ERROR) return ret;
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/* check for overflow */
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if (totalDstSize + ret < totalDstSize) return ZSTD_CONTENTSIZE_ERROR;
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totalDstSize += ret;
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}
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{ size_t const frameSrcSize = ZSTD_findFrameCompressedSize(src, srcSize);
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if (ZSTD_isError(frameSrcSize)) {
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return ZSTD_CONTENTSIZE_ERROR;
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}
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src = (const BYTE *)src + frameSrcSize;
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srcSize -= frameSrcSize;
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}
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} /* while (srcSize >= ZSTD_frameHeaderSize_prefix) */
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if (srcSize) return ZSTD_CONTENTSIZE_ERROR;
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return totalDstSize;
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}
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/** ZSTD_getDecompressedSize() :
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* compatible with legacy mode
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* @return : decompressed size if known, 0 otherwise
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note : 0 can mean any of the following :
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- frame content is empty
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- decompressed size field is not present in frame header
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- frame header unknown / not supported
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- frame header not complete (`srcSize` too small) */
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unsigned long long ZSTD_getDecompressedSize(const void* src, size_t srcSize)
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{
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unsigned long long const ret = ZSTD_getFrameContentSize(src, srcSize);
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ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_ERROR < ZSTD_CONTENTSIZE_UNKNOWN);
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return (ret >= ZSTD_CONTENTSIZE_ERROR) ? 0 : ret;
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}
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/** ZSTD_decodeFrameHeader() :
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* `headerSize` must be the size provided by ZSTD_frameHeaderSize().
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* @return : 0 if success, or an error code, which can be tested using ZSTD_isError() */
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static size_t ZSTD_decodeFrameHeader(ZSTD_DCtx* dctx, const void* src, size_t headerSize)
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{
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size_t const result = ZSTD_getFrameHeader_advanced(&(dctx->fParams), src, headerSize, dctx->format);
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if (ZSTD_isError(result)) return result; /* invalid header */
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RETURN_ERROR_IF(result>0, srcSize_wrong, "headerSize too small");
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#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
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/* Skip the dictID check in fuzzing mode, because it makes the search
|
|
* harder.
|
|
*/
|
|
RETURN_ERROR_IF(dctx->fParams.dictID && (dctx->dictID != dctx->fParams.dictID),
|
|
dictionary_wrong);
|
|
#endif
|
|
if (dctx->fParams.checksumFlag) XXH64_reset(&dctx->xxhState, 0);
|
|
return 0;
|
|
}
|
|
|
|
static ZSTD_frameSizeInfo ZSTD_errorFrameSizeInfo(size_t ret)
|
|
{
|
|
ZSTD_frameSizeInfo frameSizeInfo;
|
|
frameSizeInfo.compressedSize = ret;
|
|
frameSizeInfo.decompressedBound = ZSTD_CONTENTSIZE_ERROR;
|
|
return frameSizeInfo;
|
|
}
|
|
|
|
static ZSTD_frameSizeInfo ZSTD_findFrameSizeInfo(const void* src, size_t srcSize)
|
|
{
|
|
ZSTD_frameSizeInfo frameSizeInfo;
|
|
memset(&frameSizeInfo, 0, sizeof(ZSTD_frameSizeInfo));
|
|
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
|
|
if (ZSTD_isLegacy(src, srcSize))
|
|
return ZSTD_findFrameSizeInfoLegacy(src, srcSize);
|
|
#endif
|
|
|
|
if ((srcSize >= ZSTD_SKIPPABLEHEADERSIZE)
|
|
&& (MEM_readLE32(src) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) {
|
|
frameSizeInfo.compressedSize = readSkippableFrameSize(src, srcSize);
|
|
assert(ZSTD_isError(frameSizeInfo.compressedSize) ||
|
|
frameSizeInfo.compressedSize <= srcSize);
|
|
return frameSizeInfo;
|
|
} else {
|
|
const BYTE* ip = (const BYTE*)src;
|
|
const BYTE* const ipstart = ip;
|
|
size_t remainingSize = srcSize;
|
|
size_t nbBlocks = 0;
|
|
ZSTD_frameHeader zfh;
|
|
|
|
/* Extract Frame Header */
|
|
{ size_t const ret = ZSTD_getFrameHeader(&zfh, src, srcSize);
|
|
if (ZSTD_isError(ret))
|
|
return ZSTD_errorFrameSizeInfo(ret);
|
|
if (ret > 0)
|
|
return ZSTD_errorFrameSizeInfo(ERROR(srcSize_wrong));
|
|
}
|
|
|
|
ip += zfh.headerSize;
|
|
remainingSize -= zfh.headerSize;
|
|
|
|
/* Iterate over each block */
|
|
while (1) {
|
|
blockProperties_t blockProperties;
|
|
size_t const cBlockSize = ZSTD_getcBlockSize(ip, remainingSize, &blockProperties);
|
|
if (ZSTD_isError(cBlockSize))
|
|
return ZSTD_errorFrameSizeInfo(cBlockSize);
|
|
|
|
if (ZSTD_blockHeaderSize + cBlockSize > remainingSize)
|
|
return ZSTD_errorFrameSizeInfo(ERROR(srcSize_wrong));
|
|
|
|
ip += ZSTD_blockHeaderSize + cBlockSize;
|
|
remainingSize -= ZSTD_blockHeaderSize + cBlockSize;
|
|
nbBlocks++;
|
|
|
|
if (blockProperties.lastBlock) break;
|
|
}
|
|
|
|
/* Final frame content checksum */
|
|
if (zfh.checksumFlag) {
|
|
if (remainingSize < 4)
|
|
return ZSTD_errorFrameSizeInfo(ERROR(srcSize_wrong));
|
|
ip += 4;
|
|
}
|
|
|
|
frameSizeInfo.compressedSize = ip - ipstart;
|
|
frameSizeInfo.decompressedBound = (zfh.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN)
|
|
? zfh.frameContentSize
|
|
: nbBlocks * zfh.blockSizeMax;
|
|
return frameSizeInfo;
|
|
}
|
|
}
|
|
|
|
/** ZSTD_findFrameCompressedSize() :
|
|
* compatible with legacy mode
|
|
* `src` must point to the start of a ZSTD frame, ZSTD legacy frame, or skippable frame
|
|
* `srcSize` must be at least as large as the frame contained
|
|
* @return : the compressed size of the frame starting at `src` */
|
|
size_t ZSTD_findFrameCompressedSize(const void *src, size_t srcSize)
|
|
{
|
|
ZSTD_frameSizeInfo const frameSizeInfo = ZSTD_findFrameSizeInfo(src, srcSize);
|
|
return frameSizeInfo.compressedSize;
|
|
}
|
|
|
|
/** ZSTD_decompressBound() :
|
|
* compatible with legacy mode
|
|
* `src` must point to the start of a ZSTD frame or a skippeable frame
|
|
* `srcSize` must be at least as large as the frame contained
|
|
* @return : the maximum decompressed size of the compressed source
|
|
*/
|
|
unsigned long long ZSTD_decompressBound(const void* src, size_t srcSize)
|
|
{
|
|
unsigned long long bound = 0;
|
|
/* Iterate over each frame */
|
|
while (srcSize > 0) {
|
|
ZSTD_frameSizeInfo const frameSizeInfo = ZSTD_findFrameSizeInfo(src, srcSize);
|
|
size_t const compressedSize = frameSizeInfo.compressedSize;
|
|
unsigned long long const decompressedBound = frameSizeInfo.decompressedBound;
|
|
if (ZSTD_isError(compressedSize) || decompressedBound == ZSTD_CONTENTSIZE_ERROR)
|
|
return ZSTD_CONTENTSIZE_ERROR;
|
|
assert(srcSize >= compressedSize);
|
|
src = (const BYTE*)src + compressedSize;
|
|
srcSize -= compressedSize;
|
|
bound += decompressedBound;
|
|
}
|
|
return bound;
|
|
}
|
|
|
|
|
|
/*-*************************************************************
|
|
* Frame decoding
|
|
***************************************************************/
|
|
|
|
|
|
void ZSTD_checkContinuity(ZSTD_DCtx* dctx, const void* dst)
|
|
{
|
|
if (dst != dctx->previousDstEnd) { /* not contiguous */
|
|
dctx->dictEnd = dctx->previousDstEnd;
|
|
dctx->virtualStart = (const char*)dst - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->prefixStart));
|
|
dctx->prefixStart = dst;
|
|
dctx->previousDstEnd = dst;
|
|
}
|
|
}
|
|
|
|
/** ZSTD_insertBlock() :
|
|
insert `src` block into `dctx` history. Useful to track uncompressed blocks. */
|
|
size_t ZSTD_insertBlock(ZSTD_DCtx* dctx, const void* blockStart, size_t blockSize)
|
|
{
|
|
ZSTD_checkContinuity(dctx, blockStart);
|
|
dctx->previousDstEnd = (const char*)blockStart + blockSize;
|
|
return blockSize;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_copyRawBlock(void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_copyRawBlock");
|
|
if (dst == NULL) {
|
|
if (srcSize == 0) return 0;
|
|
RETURN_ERROR(dstBuffer_null);
|
|
}
|
|
RETURN_ERROR_IF(srcSize > dstCapacity, dstSize_tooSmall);
|
|
memcpy(dst, src, srcSize);
|
|
return srcSize;
|
|
}
|
|
|
|
static size_t ZSTD_setRleBlock(void* dst, size_t dstCapacity,
|
|
BYTE b,
|
|
size_t regenSize)
|
|
{
|
|
if (dst == NULL) {
|
|
if (regenSize == 0) return 0;
|
|
RETURN_ERROR(dstBuffer_null);
|
|
}
|
|
RETURN_ERROR_IF(regenSize > dstCapacity, dstSize_tooSmall);
|
|
memset(dst, b, regenSize);
|
|
return regenSize;
|
|
}
|
|
|
|
|
|
/*! ZSTD_decompressFrame() :
|
|
* @dctx must be properly initialized
|
|
* will update *srcPtr and *srcSizePtr,
|
|
* to make *srcPtr progress by one frame. */
|
|
static size_t ZSTD_decompressFrame(ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void** srcPtr, size_t *srcSizePtr)
|
|
{
|
|
const BYTE* ip = (const BYTE*)(*srcPtr);
|
|
BYTE* const ostart = (BYTE* const)dst;
|
|
BYTE* const oend = ostart + dstCapacity;
|
|
BYTE* op = ostart;
|
|
size_t remainingSrcSize = *srcSizePtr;
|
|
|
|
DEBUGLOG(4, "ZSTD_decompressFrame (srcSize:%i)", (int)*srcSizePtr);
|
|
|
|
/* check */
|
|
RETURN_ERROR_IF(
|
|
remainingSrcSize < ZSTD_FRAMEHEADERSIZE_MIN+ZSTD_blockHeaderSize,
|
|
srcSize_wrong);
|
|
|
|
/* Frame Header */
|
|
{ size_t const frameHeaderSize = ZSTD_frameHeaderSize(ip, ZSTD_FRAMEHEADERSIZE_PREFIX);
|
|
if (ZSTD_isError(frameHeaderSize)) return frameHeaderSize;
|
|
RETURN_ERROR_IF(remainingSrcSize < frameHeaderSize+ZSTD_blockHeaderSize,
|
|
srcSize_wrong);
|
|
FORWARD_IF_ERROR( ZSTD_decodeFrameHeader(dctx, ip, frameHeaderSize) );
|
|
ip += frameHeaderSize; remainingSrcSize -= frameHeaderSize;
|
|
}
|
|
|
|
/* Loop on each block */
|
|
while (1) {
|
|
size_t decodedSize;
|
|
blockProperties_t blockProperties;
|
|
size_t const cBlockSize = ZSTD_getcBlockSize(ip, remainingSrcSize, &blockProperties);
|
|
if (ZSTD_isError(cBlockSize)) return cBlockSize;
|
|
|
|
ip += ZSTD_blockHeaderSize;
|
|
remainingSrcSize -= ZSTD_blockHeaderSize;
|
|
RETURN_ERROR_IF(cBlockSize > remainingSrcSize, srcSize_wrong);
|
|
|
|
switch(blockProperties.blockType)
|
|
{
|
|
case bt_compressed:
|
|
decodedSize = ZSTD_decompressBlock_internal(dctx, op, oend-op, ip, cBlockSize, /* frame */ 1);
|
|
break;
|
|
case bt_raw :
|
|
decodedSize = ZSTD_copyRawBlock(op, oend-op, ip, cBlockSize);
|
|
break;
|
|
case bt_rle :
|
|
decodedSize = ZSTD_setRleBlock(op, oend-op, *ip, blockProperties.origSize);
|
|
break;
|
|
case bt_reserved :
|
|
default:
|
|
RETURN_ERROR(corruption_detected);
|
|
}
|
|
|
|
if (ZSTD_isError(decodedSize)) return decodedSize;
|
|
if (dctx->fParams.checksumFlag)
|
|
XXH64_update(&dctx->xxhState, op, decodedSize);
|
|
op += decodedSize;
|
|
ip += cBlockSize;
|
|
remainingSrcSize -= cBlockSize;
|
|
if (blockProperties.lastBlock) break;
|
|
}
|
|
|
|
if (dctx->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN) {
|
|
RETURN_ERROR_IF((U64)(op-ostart) != dctx->fParams.frameContentSize,
|
|
corruption_detected);
|
|
}
|
|
if (dctx->fParams.checksumFlag) { /* Frame content checksum verification */
|
|
U32 const checkCalc = (U32)XXH64_digest(&dctx->xxhState);
|
|
U32 checkRead;
|
|
RETURN_ERROR_IF(remainingSrcSize<4, checksum_wrong);
|
|
checkRead = MEM_readLE32(ip);
|
|
RETURN_ERROR_IF(checkRead != checkCalc, checksum_wrong);
|
|
ip += 4;
|
|
remainingSrcSize -= 4;
|
|
}
|
|
|
|
/* Allow caller to get size read */
|
|
*srcPtr = ip;
|
|
*srcSizePtr = remainingSrcSize;
|
|
return op-ostart;
|
|
}
|
|
|
|
static size_t ZSTD_decompressMultiFrame(ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict, size_t dictSize,
|
|
const ZSTD_DDict* ddict)
|
|
{
|
|
void* const dststart = dst;
|
|
int moreThan1Frame = 0;
|
|
|
|
DEBUGLOG(5, "ZSTD_decompressMultiFrame");
|
|
assert(dict==NULL || ddict==NULL); /* either dict or ddict set, not both */
|
|
|
|
if (ddict) {
|
|
dict = ZSTD_DDict_dictContent(ddict);
|
|
dictSize = ZSTD_DDict_dictSize(ddict);
|
|
}
|
|
|
|
while (srcSize >= ZSTD_FRAMEHEADERSIZE_PREFIX) {
|
|
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
|
|
if (ZSTD_isLegacy(src, srcSize)) {
|
|
size_t decodedSize;
|
|
size_t const frameSize = ZSTD_findFrameCompressedSizeLegacy(src, srcSize);
|
|
if (ZSTD_isError(frameSize)) return frameSize;
|
|
RETURN_ERROR_IF(dctx->staticSize, memory_allocation,
|
|
"legacy support is not compatible with static dctx");
|
|
|
|
decodedSize = ZSTD_decompressLegacy(dst, dstCapacity, src, frameSize, dict, dictSize);
|
|
if (ZSTD_isError(decodedSize)) return decodedSize;
|
|
|
|
assert(decodedSize <=- dstCapacity);
|
|
dst = (BYTE*)dst + decodedSize;
|
|
dstCapacity -= decodedSize;
|
|
|
|
src = (const BYTE*)src + frameSize;
|
|
srcSize -= frameSize;
|
|
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
{ U32 const magicNumber = MEM_readLE32(src);
|
|
DEBUGLOG(4, "reading magic number %08X (expecting %08X)",
|
|
(unsigned)magicNumber, ZSTD_MAGICNUMBER);
|
|
if ((magicNumber & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) {
|
|
size_t const skippableSize = readSkippableFrameSize(src, srcSize);
|
|
FORWARD_IF_ERROR(skippableSize);
|
|
assert(skippableSize <= srcSize);
|
|
|
|
src = (const BYTE *)src + skippableSize;
|
|
srcSize -= skippableSize;
|
|
continue;
|
|
} }
|
|
|
|
if (ddict) {
|
|
/* we were called from ZSTD_decompress_usingDDict */
|
|
FORWARD_IF_ERROR(ZSTD_decompressBegin_usingDDict(dctx, ddict));
|
|
} else {
|
|
/* this will initialize correctly with no dict if dict == NULL, so
|
|
* use this in all cases but ddict */
|
|
FORWARD_IF_ERROR(ZSTD_decompressBegin_usingDict(dctx, dict, dictSize));
|
|
}
|
|
ZSTD_checkContinuity(dctx, dst);
|
|
|
|
{ const size_t res = ZSTD_decompressFrame(dctx, dst, dstCapacity,
|
|
&src, &srcSize);
|
|
RETURN_ERROR_IF(
|
|
(ZSTD_getErrorCode(res) == ZSTD_error_prefix_unknown)
|
|
&& (moreThan1Frame==1),
|
|
srcSize_wrong,
|
|
"at least one frame successfully completed, but following "
|
|
"bytes are garbage: it's more likely to be a srcSize error, "
|
|
"specifying more bytes than compressed size of frame(s). This "
|
|
"error message replaces ERROR(prefix_unknown), which would be "
|
|
"confusing, as the first header is actually correct. Note that "
|
|
"one could be unlucky, it might be a corruption error instead, "
|
|
"happening right at the place where we expect zstd magic "
|
|
"bytes. But this is _much_ less likely than a srcSize field "
|
|
"error.");
|
|
if (ZSTD_isError(res)) return res;
|
|
assert(res <= dstCapacity);
|
|
dst = (BYTE*)dst + res;
|
|
dstCapacity -= res;
|
|
}
|
|
moreThan1Frame = 1;
|
|
} /* while (srcSize >= ZSTD_frameHeaderSize_prefix) */
|
|
|
|
RETURN_ERROR_IF(srcSize, srcSize_wrong, "input not entirely consumed");
|
|
|
|
return (BYTE*)dst - (BYTE*)dststart;
|
|
}
|
|
|
|
size_t ZSTD_decompress_usingDict(ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict, size_t dictSize)
|
|
{
|
|
return ZSTD_decompressMultiFrame(dctx, dst, dstCapacity, src, srcSize, dict, dictSize, NULL);
|
|
}
|
|
|
|
|
|
static ZSTD_DDict const* ZSTD_getDDict(ZSTD_DCtx* dctx)
|
|
{
|
|
switch (dctx->dictUses) {
|
|
default:
|
|
assert(0 /* Impossible */);
|
|
/* fall-through */
|
|
case ZSTD_dont_use:
|
|
ZSTD_clearDict(dctx);
|
|
return NULL;
|
|
case ZSTD_use_indefinitely:
|
|
return dctx->ddict;
|
|
case ZSTD_use_once:
|
|
dctx->dictUses = ZSTD_dont_use;
|
|
return dctx->ddict;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_decompressDCtx(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_decompress_usingDDict(dctx, dst, dstCapacity, src, srcSize, ZSTD_getDDict(dctx));
|
|
}
|
|
|
|
|
|
size_t ZSTD_decompress(void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
#if defined(ZSTD_HEAPMODE) && (ZSTD_HEAPMODE>=1)
|
|
size_t regenSize;
|
|
ZSTD_DCtx* const dctx = ZSTD_createDCtx();
|
|
RETURN_ERROR_IF(dctx==NULL, memory_allocation);
|
|
regenSize = ZSTD_decompressDCtx(dctx, dst, dstCapacity, src, srcSize);
|
|
ZSTD_freeDCtx(dctx);
|
|
return regenSize;
|
|
#else /* stack mode */
|
|
ZSTD_DCtx dctx;
|
|
ZSTD_initDCtx_internal(&dctx);
|
|
return ZSTD_decompressDCtx(&dctx, dst, dstCapacity, src, srcSize);
|
|
#endif
|
|
}
|
|
|
|
|
|
/*-**************************************
|
|
* Advanced Streaming Decompression API
|
|
* Bufferless and synchronous
|
|
****************************************/
|
|
size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx* dctx) { return dctx->expected; }
|
|
|
|
ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx* dctx) {
|
|
switch(dctx->stage)
|
|
{
|
|
default: /* should not happen */
|
|
assert(0);
|
|
case ZSTDds_getFrameHeaderSize:
|
|
case ZSTDds_decodeFrameHeader:
|
|
return ZSTDnit_frameHeader;
|
|
case ZSTDds_decodeBlockHeader:
|
|
return ZSTDnit_blockHeader;
|
|
case ZSTDds_decompressBlock:
|
|
return ZSTDnit_block;
|
|
case ZSTDds_decompressLastBlock:
|
|
return ZSTDnit_lastBlock;
|
|
case ZSTDds_checkChecksum:
|
|
return ZSTDnit_checksum;
|
|
case ZSTDds_decodeSkippableHeader:
|
|
case ZSTDds_skipFrame:
|
|
return ZSTDnit_skippableFrame;
|
|
}
|
|
}
|
|
|
|
static int ZSTD_isSkipFrame(ZSTD_DCtx* dctx) { return dctx->stage == ZSTDds_skipFrame; }
|
|
|
|
/** ZSTD_decompressContinue() :
|
|
* srcSize : must be the exact nb of bytes expected (see ZSTD_nextSrcSizeToDecompress())
|
|
* @return : nb of bytes generated into `dst` (necessarily <= `dstCapacity)
|
|
* or an error code, which can be tested using ZSTD_isError() */
|
|
size_t ZSTD_decompressContinue(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_decompressContinue (srcSize:%u)", (unsigned)srcSize);
|
|
/* Sanity check */
|
|
RETURN_ERROR_IF(srcSize != dctx->expected, srcSize_wrong, "not allowed");
|
|
if (dstCapacity) ZSTD_checkContinuity(dctx, dst);
|
|
|
|
switch (dctx->stage)
|
|
{
|
|
case ZSTDds_getFrameHeaderSize :
|
|
assert(src != NULL);
|
|
if (dctx->format == ZSTD_f_zstd1) { /* allows header */
|
|
assert(srcSize >= ZSTD_FRAMEIDSIZE); /* to read skippable magic number */
|
|
if ((MEM_readLE32(src) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) { /* skippable frame */
|
|
memcpy(dctx->headerBuffer, src, srcSize);
|
|
dctx->expected = ZSTD_SKIPPABLEHEADERSIZE - srcSize; /* remaining to load to get full skippable frame header */
|
|
dctx->stage = ZSTDds_decodeSkippableHeader;
|
|
return 0;
|
|
} }
|
|
dctx->headerSize = ZSTD_frameHeaderSize_internal(src, srcSize, dctx->format);
|
|
if (ZSTD_isError(dctx->headerSize)) return dctx->headerSize;
|
|
memcpy(dctx->headerBuffer, src, srcSize);
|
|
dctx->expected = dctx->headerSize - srcSize;
|
|
dctx->stage = ZSTDds_decodeFrameHeader;
|
|
return 0;
|
|
|
|
case ZSTDds_decodeFrameHeader:
|
|
assert(src != NULL);
|
|
memcpy(dctx->headerBuffer + (dctx->headerSize - srcSize), src, srcSize);
|
|
FORWARD_IF_ERROR(ZSTD_decodeFrameHeader(dctx, dctx->headerBuffer, dctx->headerSize));
|
|
dctx->expected = ZSTD_blockHeaderSize;
|
|
dctx->stage = ZSTDds_decodeBlockHeader;
|
|
return 0;
|
|
|
|
case ZSTDds_decodeBlockHeader:
|
|
{ blockProperties_t bp;
|
|
size_t const cBlockSize = ZSTD_getcBlockSize(src, ZSTD_blockHeaderSize, &bp);
|
|
if (ZSTD_isError(cBlockSize)) return cBlockSize;
|
|
dctx->expected = cBlockSize;
|
|
dctx->bType = bp.blockType;
|
|
dctx->rleSize = bp.origSize;
|
|
if (cBlockSize) {
|
|
dctx->stage = bp.lastBlock ? ZSTDds_decompressLastBlock : ZSTDds_decompressBlock;
|
|
return 0;
|
|
}
|
|
/* empty block */
|
|
if (bp.lastBlock) {
|
|
if (dctx->fParams.checksumFlag) {
|
|
dctx->expected = 4;
|
|
dctx->stage = ZSTDds_checkChecksum;
|
|
} else {
|
|
dctx->expected = 0; /* end of frame */
|
|
dctx->stage = ZSTDds_getFrameHeaderSize;
|
|
}
|
|
} else {
|
|
dctx->expected = ZSTD_blockHeaderSize; /* jump to next header */
|
|
dctx->stage = ZSTDds_decodeBlockHeader;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
case ZSTDds_decompressLastBlock:
|
|
case ZSTDds_decompressBlock:
|
|
DEBUGLOG(5, "ZSTD_decompressContinue: case ZSTDds_decompressBlock");
|
|
{ size_t rSize;
|
|
switch(dctx->bType)
|
|
{
|
|
case bt_compressed:
|
|
DEBUGLOG(5, "ZSTD_decompressContinue: case bt_compressed");
|
|
rSize = ZSTD_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize, /* frame */ 1);
|
|
break;
|
|
case bt_raw :
|
|
rSize = ZSTD_copyRawBlock(dst, dstCapacity, src, srcSize);
|
|
break;
|
|
case bt_rle :
|
|
rSize = ZSTD_setRleBlock(dst, dstCapacity, *(const BYTE*)src, dctx->rleSize);
|
|
break;
|
|
case bt_reserved : /* should never happen */
|
|
default:
|
|
RETURN_ERROR(corruption_detected);
|
|
}
|
|
if (ZSTD_isError(rSize)) return rSize;
|
|
DEBUGLOG(5, "ZSTD_decompressContinue: decoded size from block : %u", (unsigned)rSize);
|
|
dctx->decodedSize += rSize;
|
|
if (dctx->fParams.checksumFlag) XXH64_update(&dctx->xxhState, dst, rSize);
|
|
|
|
if (dctx->stage == ZSTDds_decompressLastBlock) { /* end of frame */
|
|
DEBUGLOG(4, "ZSTD_decompressContinue: decoded size from frame : %u", (unsigned)dctx->decodedSize);
|
|
RETURN_ERROR_IF(
|
|
dctx->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN
|
|
&& dctx->decodedSize != dctx->fParams.frameContentSize,
|
|
corruption_detected);
|
|
if (dctx->fParams.checksumFlag) { /* another round for frame checksum */
|
|
dctx->expected = 4;
|
|
dctx->stage = ZSTDds_checkChecksum;
|
|
} else {
|
|
dctx->expected = 0; /* ends here */
|
|
dctx->stage = ZSTDds_getFrameHeaderSize;
|
|
}
|
|
} else {
|
|
dctx->stage = ZSTDds_decodeBlockHeader;
|
|
dctx->expected = ZSTD_blockHeaderSize;
|
|
dctx->previousDstEnd = (char*)dst + rSize;
|
|
}
|
|
return rSize;
|
|
}
|
|
|
|
case ZSTDds_checkChecksum:
|
|
assert(srcSize == 4); /* guaranteed by dctx->expected */
|
|
{ U32 const h32 = (U32)XXH64_digest(&dctx->xxhState);
|
|
U32 const check32 = MEM_readLE32(src);
|
|
DEBUGLOG(4, "ZSTD_decompressContinue: checksum : calculated %08X :: %08X read", (unsigned)h32, (unsigned)check32);
|
|
RETURN_ERROR_IF(check32 != h32, checksum_wrong);
|
|
dctx->expected = 0;
|
|
dctx->stage = ZSTDds_getFrameHeaderSize;
|
|
return 0;
|
|
}
|
|
|
|
case ZSTDds_decodeSkippableHeader:
|
|
assert(src != NULL);
|
|
assert(srcSize <= ZSTD_SKIPPABLEHEADERSIZE);
|
|
memcpy(dctx->headerBuffer + (ZSTD_SKIPPABLEHEADERSIZE - srcSize), src, srcSize); /* complete skippable header */
|
|
dctx->expected = MEM_readLE32(dctx->headerBuffer + ZSTD_FRAMEIDSIZE); /* note : dctx->expected can grow seriously large, beyond local buffer size */
|
|
dctx->stage = ZSTDds_skipFrame;
|
|
return 0;
|
|
|
|
case ZSTDds_skipFrame:
|
|
dctx->expected = 0;
|
|
dctx->stage = ZSTDds_getFrameHeaderSize;
|
|
return 0;
|
|
|
|
default:
|
|
assert(0); /* impossible */
|
|
RETURN_ERROR(GENERIC); /* some compiler require default to do something */
|
|
}
|
|
}
|
|
|
|
|
|
static size_t ZSTD_refDictContent(ZSTD_DCtx* dctx, const void* dict, size_t dictSize)
|
|
{
|
|
dctx->dictEnd = dctx->previousDstEnd;
|
|
dctx->virtualStart = (const char*)dict - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->prefixStart));
|
|
dctx->prefixStart = dict;
|
|
dctx->previousDstEnd = (const char*)dict + dictSize;
|
|
return 0;
|
|
}
|
|
|
|
/*! ZSTD_loadDEntropy() :
|
|
* dict : must point at beginning of a valid zstd dictionary.
|
|
* @return : size of entropy tables read */
|
|
size_t
|
|
ZSTD_loadDEntropy(ZSTD_entropyDTables_t* entropy,
|
|
const void* const dict, size_t const dictSize)
|
|
{
|
|
const BYTE* dictPtr = (const BYTE*)dict;
|
|
const BYTE* const dictEnd = dictPtr + dictSize;
|
|
|
|
RETURN_ERROR_IF(dictSize <= 8, dictionary_corrupted);
|
|
assert(MEM_readLE32(dict) == ZSTD_MAGIC_DICTIONARY); /* dict must be valid */
|
|
dictPtr += 8; /* skip header = magic + dictID */
|
|
|
|
ZSTD_STATIC_ASSERT(offsetof(ZSTD_entropyDTables_t, OFTable) == offsetof(ZSTD_entropyDTables_t, LLTable) + sizeof(entropy->LLTable));
|
|
ZSTD_STATIC_ASSERT(offsetof(ZSTD_entropyDTables_t, MLTable) == offsetof(ZSTD_entropyDTables_t, OFTable) + sizeof(entropy->OFTable));
|
|
ZSTD_STATIC_ASSERT(sizeof(entropy->LLTable) + sizeof(entropy->OFTable) + sizeof(entropy->MLTable) >= HUF_DECOMPRESS_WORKSPACE_SIZE);
|
|
{ void* const workspace = &entropy->LLTable; /* use fse tables as temporary workspace; implies fse tables are grouped together */
|
|
size_t const workspaceSize = sizeof(entropy->LLTable) + sizeof(entropy->OFTable) + sizeof(entropy->MLTable);
|
|
#ifdef HUF_FORCE_DECOMPRESS_X1
|
|
/* in minimal huffman, we always use X1 variants */
|
|
size_t const hSize = HUF_readDTableX1_wksp(entropy->hufTable,
|
|
dictPtr, dictEnd - dictPtr,
|
|
workspace, workspaceSize);
|
|
#else
|
|
size_t const hSize = HUF_readDTableX2_wksp(entropy->hufTable,
|
|
dictPtr, dictEnd - dictPtr,
|
|
workspace, workspaceSize);
|
|
#endif
|
|
RETURN_ERROR_IF(HUF_isError(hSize), dictionary_corrupted);
|
|
dictPtr += hSize;
|
|
}
|
|
|
|
{ short offcodeNCount[MaxOff+1];
|
|
unsigned offcodeMaxValue = MaxOff, offcodeLog;
|
|
size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr);
|
|
RETURN_ERROR_IF(FSE_isError(offcodeHeaderSize), dictionary_corrupted);
|
|
RETURN_ERROR_IF(offcodeMaxValue > MaxOff, dictionary_corrupted);
|
|
RETURN_ERROR_IF(offcodeLog > OffFSELog, dictionary_corrupted);
|
|
ZSTD_buildFSETable( entropy->OFTable,
|
|
offcodeNCount, offcodeMaxValue,
|
|
OF_base, OF_bits,
|
|
offcodeLog);
|
|
dictPtr += offcodeHeaderSize;
|
|
}
|
|
|
|
{ short matchlengthNCount[MaxML+1];
|
|
unsigned matchlengthMaxValue = MaxML, matchlengthLog;
|
|
size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, dictEnd-dictPtr);
|
|
RETURN_ERROR_IF(FSE_isError(matchlengthHeaderSize), dictionary_corrupted);
|
|
RETURN_ERROR_IF(matchlengthMaxValue > MaxML, dictionary_corrupted);
|
|
RETURN_ERROR_IF(matchlengthLog > MLFSELog, dictionary_corrupted);
|
|
ZSTD_buildFSETable( entropy->MLTable,
|
|
matchlengthNCount, matchlengthMaxValue,
|
|
ML_base, ML_bits,
|
|
matchlengthLog);
|
|
dictPtr += matchlengthHeaderSize;
|
|
}
|
|
|
|
{ short litlengthNCount[MaxLL+1];
|
|
unsigned litlengthMaxValue = MaxLL, litlengthLog;
|
|
size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, dictEnd-dictPtr);
|
|
RETURN_ERROR_IF(FSE_isError(litlengthHeaderSize), dictionary_corrupted);
|
|
RETURN_ERROR_IF(litlengthMaxValue > MaxLL, dictionary_corrupted);
|
|
RETURN_ERROR_IF(litlengthLog > LLFSELog, dictionary_corrupted);
|
|
ZSTD_buildFSETable( entropy->LLTable,
|
|
litlengthNCount, litlengthMaxValue,
|
|
LL_base, LL_bits,
|
|
litlengthLog);
|
|
dictPtr += litlengthHeaderSize;
|
|
}
|
|
|
|
RETURN_ERROR_IF(dictPtr+12 > dictEnd, dictionary_corrupted);
|
|
{ int i;
|
|
size_t const dictContentSize = (size_t)(dictEnd - (dictPtr+12));
|
|
for (i=0; i<3; i++) {
|
|
U32 const rep = MEM_readLE32(dictPtr); dictPtr += 4;
|
|
RETURN_ERROR_IF(rep==0 || rep >= dictContentSize,
|
|
dictionary_corrupted);
|
|
entropy->rep[i] = rep;
|
|
} }
|
|
|
|
return dictPtr - (const BYTE*)dict;
|
|
}
|
|
|
|
static size_t ZSTD_decompress_insertDictionary(ZSTD_DCtx* dctx, const void* dict, size_t dictSize)
|
|
{
|
|
if (dictSize < 8) return ZSTD_refDictContent(dctx, dict, dictSize);
|
|
{ U32 const magic = MEM_readLE32(dict);
|
|
if (magic != ZSTD_MAGIC_DICTIONARY) {
|
|
return ZSTD_refDictContent(dctx, dict, dictSize); /* pure content mode */
|
|
} }
|
|
dctx->dictID = MEM_readLE32((const char*)dict + ZSTD_FRAMEIDSIZE);
|
|
|
|
/* load entropy tables */
|
|
{ size_t const eSize = ZSTD_loadDEntropy(&dctx->entropy, dict, dictSize);
|
|
RETURN_ERROR_IF(ZSTD_isError(eSize), dictionary_corrupted);
|
|
dict = (const char*)dict + eSize;
|
|
dictSize -= eSize;
|
|
}
|
|
dctx->litEntropy = dctx->fseEntropy = 1;
|
|
|
|
/* reference dictionary content */
|
|
return ZSTD_refDictContent(dctx, dict, dictSize);
|
|
}
|
|
|
|
size_t ZSTD_decompressBegin(ZSTD_DCtx* dctx)
|
|
{
|
|
assert(dctx != NULL);
|
|
dctx->expected = ZSTD_startingInputLength(dctx->format); /* dctx->format must be properly set */
|
|
dctx->stage = ZSTDds_getFrameHeaderSize;
|
|
dctx->decodedSize = 0;
|
|
dctx->previousDstEnd = NULL;
|
|
dctx->prefixStart = NULL;
|
|
dctx->virtualStart = NULL;
|
|
dctx->dictEnd = NULL;
|
|
dctx->entropy.hufTable[0] = (HUF_DTable)((HufLog)*0x1000001); /* cover both little and big endian */
|
|
dctx->litEntropy = dctx->fseEntropy = 0;
|
|
dctx->dictID = 0;
|
|
ZSTD_STATIC_ASSERT(sizeof(dctx->entropy.rep) == sizeof(repStartValue));
|
|
memcpy(dctx->entropy.rep, repStartValue, sizeof(repStartValue)); /* initial repcodes */
|
|
dctx->LLTptr = dctx->entropy.LLTable;
|
|
dctx->MLTptr = dctx->entropy.MLTable;
|
|
dctx->OFTptr = dctx->entropy.OFTable;
|
|
dctx->HUFptr = dctx->entropy.hufTable;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_decompressBegin_usingDict(ZSTD_DCtx* dctx, const void* dict, size_t dictSize)
|
|
{
|
|
FORWARD_IF_ERROR( ZSTD_decompressBegin(dctx) );
|
|
if (dict && dictSize)
|
|
RETURN_ERROR_IF(
|
|
ZSTD_isError(ZSTD_decompress_insertDictionary(dctx, dict, dictSize)),
|
|
dictionary_corrupted);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* ====== ZSTD_DDict ====== */
|
|
|
|
size_t ZSTD_decompressBegin_usingDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_decompressBegin_usingDDict");
|
|
assert(dctx != NULL);
|
|
if (ddict) {
|
|
const char* const dictStart = (const char*)ZSTD_DDict_dictContent(ddict);
|
|
size_t const dictSize = ZSTD_DDict_dictSize(ddict);
|
|
const void* const dictEnd = dictStart + dictSize;
|
|
dctx->ddictIsCold = (dctx->dictEnd != dictEnd);
|
|
DEBUGLOG(4, "DDict is %s",
|
|
dctx->ddictIsCold ? "~cold~" : "hot!");
|
|
}
|
|
FORWARD_IF_ERROR( ZSTD_decompressBegin(dctx) );
|
|
if (ddict) { /* NULL ddict is equivalent to no dictionary */
|
|
ZSTD_copyDDictParameters(dctx, ddict);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*! ZSTD_getDictID_fromDict() :
|
|
* Provides the dictID stored within dictionary.
|
|
* if @return == 0, the dictionary is not conformant with Zstandard specification.
|
|
* It can still be loaded, but as a content-only dictionary. */
|
|
unsigned ZSTD_getDictID_fromDict(const void* dict, size_t dictSize)
|
|
{
|
|
if (dictSize < 8) return 0;
|
|
if (MEM_readLE32(dict) != ZSTD_MAGIC_DICTIONARY) return 0;
|
|
return MEM_readLE32((const char*)dict + ZSTD_FRAMEIDSIZE);
|
|
}
|
|
|
|
/*! ZSTD_getDictID_fromFrame() :
|
|
* Provides the dictID required to decompress frame stored within `src`.
|
|
* If @return == 0, the dictID could not be decoded.
|
|
* This could for one of the following reasons :
|
|
* - The frame does not require a dictionary (most common case).
|
|
* - The frame was built with dictID intentionally removed.
|
|
* Needed dictionary is a hidden information.
|
|
* Note : this use case also happens when using a non-conformant dictionary.
|
|
* - `srcSize` is too small, and as a result, frame header could not be decoded.
|
|
* Note : possible if `srcSize < ZSTD_FRAMEHEADERSIZE_MAX`.
|
|
* - This is not a Zstandard frame.
|
|
* When identifying the exact failure cause, it's possible to use
|
|
* ZSTD_getFrameHeader(), which will provide a more precise error code. */
|
|
unsigned ZSTD_getDictID_fromFrame(const void* src, size_t srcSize)
|
|
{
|
|
ZSTD_frameHeader zfp = { 0, 0, 0, ZSTD_frame, 0, 0, 0 };
|
|
size_t const hError = ZSTD_getFrameHeader(&zfp, src, srcSize);
|
|
if (ZSTD_isError(hError)) return 0;
|
|
return zfp.dictID;
|
|
}
|
|
|
|
|
|
/*! ZSTD_decompress_usingDDict() :
|
|
* Decompression using a pre-digested Dictionary
|
|
* Use dictionary without significant overhead. */
|
|
size_t ZSTD_decompress_usingDDict(ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const ZSTD_DDict* ddict)
|
|
{
|
|
/* pass content and size in case legacy frames are encountered */
|
|
return ZSTD_decompressMultiFrame(dctx, dst, dstCapacity, src, srcSize,
|
|
NULL, 0,
|
|
ddict);
|
|
}
|
|
|
|
|
|
/*=====================================
|
|
* Streaming decompression
|
|
*====================================*/
|
|
|
|
ZSTD_DStream* ZSTD_createDStream(void)
|
|
{
|
|
DEBUGLOG(3, "ZSTD_createDStream");
|
|
return ZSTD_createDStream_advanced(ZSTD_defaultCMem);
|
|
}
|
|
|
|
ZSTD_DStream* ZSTD_initStaticDStream(void *workspace, size_t workspaceSize)
|
|
{
|
|
return ZSTD_initStaticDCtx(workspace, workspaceSize);
|
|
}
|
|
|
|
ZSTD_DStream* ZSTD_createDStream_advanced(ZSTD_customMem customMem)
|
|
{
|
|
return ZSTD_createDCtx_advanced(customMem);
|
|
}
|
|
|
|
size_t ZSTD_freeDStream(ZSTD_DStream* zds)
|
|
{
|
|
return ZSTD_freeDCtx(zds);
|
|
}
|
|
|
|
|
|
/* *** Initialization *** */
|
|
|
|
size_t ZSTD_DStreamInSize(void) { return ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize; }
|
|
size_t ZSTD_DStreamOutSize(void) { return ZSTD_BLOCKSIZE_MAX; }
|
|
|
|
size_t ZSTD_DCtx_loadDictionary_advanced(ZSTD_DCtx* dctx,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictContentType_e dictContentType)
|
|
{
|
|
RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong);
|
|
ZSTD_clearDict(dctx);
|
|
if (dict && dictSize >= 8) {
|
|
dctx->ddictLocal = ZSTD_createDDict_advanced(dict, dictSize, dictLoadMethod, dictContentType, dctx->customMem);
|
|
RETURN_ERROR_IF(dctx->ddictLocal == NULL, memory_allocation);
|
|
dctx->ddict = dctx->ddictLocal;
|
|
dctx->dictUses = ZSTD_use_indefinitely;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_DCtx_loadDictionary_byReference(ZSTD_DCtx* dctx, const void* dict, size_t dictSize)
|
|
{
|
|
return ZSTD_DCtx_loadDictionary_advanced(dctx, dict, dictSize, ZSTD_dlm_byRef, ZSTD_dct_auto);
|
|
}
|
|
|
|
size_t ZSTD_DCtx_loadDictionary(ZSTD_DCtx* dctx, const void* dict, size_t dictSize)
|
|
{
|
|
return ZSTD_DCtx_loadDictionary_advanced(dctx, dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto);
|
|
}
|
|
|
|
size_t ZSTD_DCtx_refPrefix_advanced(ZSTD_DCtx* dctx, const void* prefix, size_t prefixSize, ZSTD_dictContentType_e dictContentType)
|
|
{
|
|
FORWARD_IF_ERROR(ZSTD_DCtx_loadDictionary_advanced(dctx, prefix, prefixSize, ZSTD_dlm_byRef, dictContentType));
|
|
dctx->dictUses = ZSTD_use_once;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_DCtx_refPrefix(ZSTD_DCtx* dctx, const void* prefix, size_t prefixSize)
|
|
{
|
|
return ZSTD_DCtx_refPrefix_advanced(dctx, prefix, prefixSize, ZSTD_dct_rawContent);
|
|
}
|
|
|
|
|
|
/* ZSTD_initDStream_usingDict() :
|
|
* return : expected size, aka ZSTD_FRAMEHEADERSIZE_PREFIX.
|
|
* this function cannot fail */
|
|
size_t ZSTD_initDStream_usingDict(ZSTD_DStream* zds, const void* dict, size_t dictSize)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_initDStream_usingDict");
|
|
FORWARD_IF_ERROR( ZSTD_DCtx_reset(zds, ZSTD_reset_session_only) );
|
|
FORWARD_IF_ERROR( ZSTD_DCtx_loadDictionary(zds, dict, dictSize) );
|
|
return ZSTD_FRAMEHEADERSIZE_PREFIX;
|
|
}
|
|
|
|
/* note : this variant can't fail */
|
|
size_t ZSTD_initDStream(ZSTD_DStream* zds)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_initDStream");
|
|
return ZSTD_initDStream_usingDDict(zds, NULL);
|
|
}
|
|
|
|
/* ZSTD_initDStream_usingDDict() :
|
|
* ddict will just be referenced, and must outlive decompression session
|
|
* this function cannot fail */
|
|
size_t ZSTD_initDStream_usingDDict(ZSTD_DStream* dctx, const ZSTD_DDict* ddict)
|
|
{
|
|
FORWARD_IF_ERROR( ZSTD_DCtx_reset(dctx, ZSTD_reset_session_only) );
|
|
FORWARD_IF_ERROR( ZSTD_DCtx_refDDict(dctx, ddict) );
|
|
return ZSTD_FRAMEHEADERSIZE_PREFIX;
|
|
}
|
|
|
|
/* ZSTD_resetDStream() :
|
|
* return : expected size, aka ZSTD_FRAMEHEADERSIZE_PREFIX.
|
|
* this function cannot fail */
|
|
size_t ZSTD_resetDStream(ZSTD_DStream* dctx)
|
|
{
|
|
FORWARD_IF_ERROR(ZSTD_DCtx_reset(dctx, ZSTD_reset_session_only));
|
|
return ZSTD_FRAMEHEADERSIZE_PREFIX;
|
|
}
|
|
|
|
|
|
size_t ZSTD_DCtx_refDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict)
|
|
{
|
|
RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong);
|
|
ZSTD_clearDict(dctx);
|
|
if (ddict) {
|
|
dctx->ddict = ddict;
|
|
dctx->dictUses = ZSTD_use_indefinitely;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* ZSTD_DCtx_setMaxWindowSize() :
|
|
* note : no direct equivalence in ZSTD_DCtx_setParameter,
|
|
* since this version sets windowSize, and the other sets windowLog */
|
|
size_t ZSTD_DCtx_setMaxWindowSize(ZSTD_DCtx* dctx, size_t maxWindowSize)
|
|
{
|
|
ZSTD_bounds const bounds = ZSTD_dParam_getBounds(ZSTD_d_windowLogMax);
|
|
size_t const min = (size_t)1 << bounds.lowerBound;
|
|
size_t const max = (size_t)1 << bounds.upperBound;
|
|
RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong);
|
|
RETURN_ERROR_IF(maxWindowSize < min, parameter_outOfBound);
|
|
RETURN_ERROR_IF(maxWindowSize > max, parameter_outOfBound);
|
|
dctx->maxWindowSize = maxWindowSize;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_DCtx_setFormat(ZSTD_DCtx* dctx, ZSTD_format_e format)
|
|
{
|
|
return ZSTD_DCtx_setParameter(dctx, ZSTD_d_format, format);
|
|
}
|
|
|
|
ZSTD_bounds ZSTD_dParam_getBounds(ZSTD_dParameter dParam)
|
|
{
|
|
ZSTD_bounds bounds = { 0, 0, 0 };
|
|
switch(dParam) {
|
|
case ZSTD_d_windowLogMax:
|
|
bounds.lowerBound = ZSTD_WINDOWLOG_ABSOLUTEMIN;
|
|
bounds.upperBound = ZSTD_WINDOWLOG_MAX;
|
|
return bounds;
|
|
case ZSTD_d_format:
|
|
bounds.lowerBound = (int)ZSTD_f_zstd1;
|
|
bounds.upperBound = (int)ZSTD_f_zstd1_magicless;
|
|
ZSTD_STATIC_ASSERT(ZSTD_f_zstd1 < ZSTD_f_zstd1_magicless);
|
|
return bounds;
|
|
default:;
|
|
}
|
|
bounds.error = ERROR(parameter_unsupported);
|
|
return bounds;
|
|
}
|
|
|
|
/* ZSTD_dParam_withinBounds:
|
|
* @return 1 if value is within dParam bounds,
|
|
* 0 otherwise */
|
|
static int ZSTD_dParam_withinBounds(ZSTD_dParameter dParam, int value)
|
|
{
|
|
ZSTD_bounds const bounds = ZSTD_dParam_getBounds(dParam);
|
|
if (ZSTD_isError(bounds.error)) return 0;
|
|
if (value < bounds.lowerBound) return 0;
|
|
if (value > bounds.upperBound) return 0;
|
|
return 1;
|
|
}
|
|
|
|
#define CHECK_DBOUNDS(p,v) { \
|
|
RETURN_ERROR_IF(!ZSTD_dParam_withinBounds(p, v), parameter_outOfBound); \
|
|
}
|
|
|
|
size_t ZSTD_DCtx_setParameter(ZSTD_DCtx* dctx, ZSTD_dParameter dParam, int value)
|
|
{
|
|
RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong);
|
|
switch(dParam) {
|
|
case ZSTD_d_windowLogMax:
|
|
if (value == 0) value = ZSTD_WINDOWLOG_LIMIT_DEFAULT;
|
|
CHECK_DBOUNDS(ZSTD_d_windowLogMax, value);
|
|
dctx->maxWindowSize = ((size_t)1) << value;
|
|
return 0;
|
|
case ZSTD_d_format:
|
|
CHECK_DBOUNDS(ZSTD_d_format, value);
|
|
dctx->format = (ZSTD_format_e)value;
|
|
return 0;
|
|
default:;
|
|
}
|
|
RETURN_ERROR(parameter_unsupported);
|
|
}
|
|
|
|
size_t ZSTD_DCtx_reset(ZSTD_DCtx* dctx, ZSTD_ResetDirective reset)
|
|
{
|
|
if ( (reset == ZSTD_reset_session_only)
|
|
|| (reset == ZSTD_reset_session_and_parameters) ) {
|
|
dctx->streamStage = zdss_init;
|
|
dctx->noForwardProgress = 0;
|
|
}
|
|
if ( (reset == ZSTD_reset_parameters)
|
|
|| (reset == ZSTD_reset_session_and_parameters) ) {
|
|
RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong);
|
|
ZSTD_clearDict(dctx);
|
|
dctx->format = ZSTD_f_zstd1;
|
|
dctx->maxWindowSize = ZSTD_MAXWINDOWSIZE_DEFAULT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
size_t ZSTD_sizeof_DStream(const ZSTD_DStream* dctx)
|
|
{
|
|
return ZSTD_sizeof_DCtx(dctx);
|
|
}
|
|
|
|
size_t ZSTD_decodingBufferSize_min(unsigned long long windowSize, unsigned long long frameContentSize)
|
|
{
|
|
size_t const blockSize = (size_t) MIN(windowSize, ZSTD_BLOCKSIZE_MAX);
|
|
unsigned long long const neededRBSize = windowSize + blockSize + (WILDCOPY_OVERLENGTH * 2);
|
|
unsigned long long const neededSize = MIN(frameContentSize, neededRBSize);
|
|
size_t const minRBSize = (size_t) neededSize;
|
|
RETURN_ERROR_IF((unsigned long long)minRBSize != neededSize,
|
|
frameParameter_windowTooLarge);
|
|
return minRBSize;
|
|
}
|
|
|
|
size_t ZSTD_estimateDStreamSize(size_t windowSize)
|
|
{
|
|
size_t const blockSize = MIN(windowSize, ZSTD_BLOCKSIZE_MAX);
|
|
size_t const inBuffSize = blockSize; /* no block can be larger */
|
|
size_t const outBuffSize = ZSTD_decodingBufferSize_min(windowSize, ZSTD_CONTENTSIZE_UNKNOWN);
|
|
return ZSTD_estimateDCtxSize() + inBuffSize + outBuffSize;
|
|
}
|
|
|
|
size_t ZSTD_estimateDStreamSize_fromFrame(const void* src, size_t srcSize)
|
|
{
|
|
U32 const windowSizeMax = 1U << ZSTD_WINDOWLOG_MAX; /* note : should be user-selectable, but requires an additional parameter (or a dctx) */
|
|
ZSTD_frameHeader zfh;
|
|
size_t const err = ZSTD_getFrameHeader(&zfh, src, srcSize);
|
|
if (ZSTD_isError(err)) return err;
|
|
RETURN_ERROR_IF(err>0, srcSize_wrong);
|
|
RETURN_ERROR_IF(zfh.windowSize > windowSizeMax,
|
|
frameParameter_windowTooLarge);
|
|
return ZSTD_estimateDStreamSize((size_t)zfh.windowSize);
|
|
}
|
|
|
|
|
|
/* ***** Decompression ***** */
|
|
|
|
MEM_STATIC size_t ZSTD_limitCopy(void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
size_t const length = MIN(dstCapacity, srcSize);
|
|
memcpy(dst, src, length);
|
|
return length;
|
|
}
|
|
|
|
|
|
size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
|
|
{
|
|
const char* const istart = (const char*)(input->src) + input->pos;
|
|
const char* const iend = (const char*)(input->src) + input->size;
|
|
const char* ip = istart;
|
|
char* const ostart = (char*)(output->dst) + output->pos;
|
|
char* const oend = (char*)(output->dst) + output->size;
|
|
char* op = ostart;
|
|
U32 someMoreWork = 1;
|
|
|
|
DEBUGLOG(5, "ZSTD_decompressStream");
|
|
RETURN_ERROR_IF(
|
|
input->pos > input->size,
|
|
srcSize_wrong,
|
|
"forbidden. in: pos: %u vs size: %u",
|
|
(U32)input->pos, (U32)input->size);
|
|
RETURN_ERROR_IF(
|
|
output->pos > output->size,
|
|
dstSize_tooSmall,
|
|
"forbidden. out: pos: %u vs size: %u",
|
|
(U32)output->pos, (U32)output->size);
|
|
DEBUGLOG(5, "input size : %u", (U32)(input->size - input->pos));
|
|
|
|
while (someMoreWork) {
|
|
switch(zds->streamStage)
|
|
{
|
|
case zdss_init :
|
|
DEBUGLOG(5, "stage zdss_init => transparent reset ");
|
|
zds->streamStage = zdss_loadHeader;
|
|
zds->lhSize = zds->inPos = zds->outStart = zds->outEnd = 0;
|
|
zds->legacyVersion = 0;
|
|
zds->hostageByte = 0;
|
|
/* fall-through */
|
|
|
|
case zdss_loadHeader :
|
|
DEBUGLOG(5, "stage zdss_loadHeader (srcSize : %u)", (U32)(iend - ip));
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
|
|
if (zds->legacyVersion) {
|
|
RETURN_ERROR_IF(zds->staticSize, memory_allocation,
|
|
"legacy support is incompatible with static dctx");
|
|
{ size_t const hint = ZSTD_decompressLegacyStream(zds->legacyContext, zds->legacyVersion, output, input);
|
|
if (hint==0) zds->streamStage = zdss_init;
|
|
return hint;
|
|
} }
|
|
#endif
|
|
{ size_t const hSize = ZSTD_getFrameHeader_advanced(&zds->fParams, zds->headerBuffer, zds->lhSize, zds->format);
|
|
DEBUGLOG(5, "header size : %u", (U32)hSize);
|
|
if (ZSTD_isError(hSize)) {
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
|
|
U32 const legacyVersion = ZSTD_isLegacy(istart, iend-istart);
|
|
if (legacyVersion) {
|
|
ZSTD_DDict const* const ddict = ZSTD_getDDict(zds);
|
|
const void* const dict = ddict ? ZSTD_DDict_dictContent(ddict) : NULL;
|
|
size_t const dictSize = ddict ? ZSTD_DDict_dictSize(ddict) : 0;
|
|
DEBUGLOG(5, "ZSTD_decompressStream: detected legacy version v0.%u", legacyVersion);
|
|
RETURN_ERROR_IF(zds->staticSize, memory_allocation,
|
|
"legacy support is incompatible with static dctx");
|
|
FORWARD_IF_ERROR(ZSTD_initLegacyStream(&zds->legacyContext,
|
|
zds->previousLegacyVersion, legacyVersion,
|
|
dict, dictSize));
|
|
zds->legacyVersion = zds->previousLegacyVersion = legacyVersion;
|
|
{ size_t const hint = ZSTD_decompressLegacyStream(zds->legacyContext, legacyVersion, output, input);
|
|
if (hint==0) zds->streamStage = zdss_init; /* or stay in stage zdss_loadHeader */
|
|
return hint;
|
|
} }
|
|
#endif
|
|
return hSize; /* error */
|
|
}
|
|
if (hSize != 0) { /* need more input */
|
|
size_t const toLoad = hSize - zds->lhSize; /* if hSize!=0, hSize > zds->lhSize */
|
|
size_t const remainingInput = (size_t)(iend-ip);
|
|
assert(iend >= ip);
|
|
if (toLoad > remainingInput) { /* not enough input to load full header */
|
|
if (remainingInput > 0) {
|
|
memcpy(zds->headerBuffer + zds->lhSize, ip, remainingInput);
|
|
zds->lhSize += remainingInput;
|
|
}
|
|
input->pos = input->size;
|
|
return (MAX(ZSTD_FRAMEHEADERSIZE_MIN, hSize) - zds->lhSize) + ZSTD_blockHeaderSize; /* remaining header bytes + next block header */
|
|
}
|
|
assert(ip != NULL);
|
|
memcpy(zds->headerBuffer + zds->lhSize, ip, toLoad); zds->lhSize = hSize; ip += toLoad;
|
|
break;
|
|
} }
|
|
|
|
/* check for single-pass mode opportunity */
|
|
if (zds->fParams.frameContentSize && zds->fParams.windowSize /* skippable frame if == 0 */
|
|
&& (U64)(size_t)(oend-op) >= zds->fParams.frameContentSize) {
|
|
size_t const cSize = ZSTD_findFrameCompressedSize(istart, iend-istart);
|
|
if (cSize <= (size_t)(iend-istart)) {
|
|
/* shortcut : using single-pass mode */
|
|
size_t const decompressedSize = ZSTD_decompress_usingDDict(zds, op, oend-op, istart, cSize, ZSTD_getDDict(zds));
|
|
if (ZSTD_isError(decompressedSize)) return decompressedSize;
|
|
DEBUGLOG(4, "shortcut to single-pass ZSTD_decompress_usingDDict()")
|
|
ip = istart + cSize;
|
|
op += decompressedSize;
|
|
zds->expected = 0;
|
|
zds->streamStage = zdss_init;
|
|
someMoreWork = 0;
|
|
break;
|
|
} }
|
|
|
|
/* Consume header (see ZSTDds_decodeFrameHeader) */
|
|
DEBUGLOG(4, "Consume header");
|
|
FORWARD_IF_ERROR(ZSTD_decompressBegin_usingDDict(zds, ZSTD_getDDict(zds)));
|
|
|
|
if ((MEM_readLE32(zds->headerBuffer) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) { /* skippable frame */
|
|
zds->expected = MEM_readLE32(zds->headerBuffer + ZSTD_FRAMEIDSIZE);
|
|
zds->stage = ZSTDds_skipFrame;
|
|
} else {
|
|
FORWARD_IF_ERROR(ZSTD_decodeFrameHeader(zds, zds->headerBuffer, zds->lhSize));
|
|
zds->expected = ZSTD_blockHeaderSize;
|
|
zds->stage = ZSTDds_decodeBlockHeader;
|
|
}
|
|
|
|
/* control buffer memory usage */
|
|
DEBUGLOG(4, "Control max memory usage (%u KB <= max %u KB)",
|
|
(U32)(zds->fParams.windowSize >>10),
|
|
(U32)(zds->maxWindowSize >> 10) );
|
|
zds->fParams.windowSize = MAX(zds->fParams.windowSize, 1U << ZSTD_WINDOWLOG_ABSOLUTEMIN);
|
|
RETURN_ERROR_IF(zds->fParams.windowSize > zds->maxWindowSize,
|
|
frameParameter_windowTooLarge);
|
|
|
|
/* Adapt buffer sizes to frame header instructions */
|
|
{ size_t const neededInBuffSize = MAX(zds->fParams.blockSizeMax, 4 /* frame checksum */);
|
|
size_t const neededOutBuffSize = ZSTD_decodingBufferSize_min(zds->fParams.windowSize, zds->fParams.frameContentSize);
|
|
if ((zds->inBuffSize < neededInBuffSize) || (zds->outBuffSize < neededOutBuffSize)) {
|
|
size_t const bufferSize = neededInBuffSize + neededOutBuffSize;
|
|
DEBUGLOG(4, "inBuff : from %u to %u",
|
|
(U32)zds->inBuffSize, (U32)neededInBuffSize);
|
|
DEBUGLOG(4, "outBuff : from %u to %u",
|
|
(U32)zds->outBuffSize, (U32)neededOutBuffSize);
|
|
if (zds->staticSize) { /* static DCtx */
|
|
DEBUGLOG(4, "staticSize : %u", (U32)zds->staticSize);
|
|
assert(zds->staticSize >= sizeof(ZSTD_DCtx)); /* controlled at init */
|
|
RETURN_ERROR_IF(
|
|
bufferSize > zds->staticSize - sizeof(ZSTD_DCtx),
|
|
memory_allocation);
|
|
} else {
|
|
ZSTD_free(zds->inBuff, zds->customMem);
|
|
zds->inBuffSize = 0;
|
|
zds->outBuffSize = 0;
|
|
zds->inBuff = (char*)ZSTD_malloc(bufferSize, zds->customMem);
|
|
RETURN_ERROR_IF(zds->inBuff == NULL, memory_allocation);
|
|
}
|
|
zds->inBuffSize = neededInBuffSize;
|
|
zds->outBuff = zds->inBuff + zds->inBuffSize;
|
|
zds->outBuffSize = neededOutBuffSize;
|
|
} }
|
|
zds->streamStage = zdss_read;
|
|
/* fall-through */
|
|
|
|
case zdss_read:
|
|
DEBUGLOG(5, "stage zdss_read");
|
|
{ size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zds);
|
|
DEBUGLOG(5, "neededInSize = %u", (U32)neededInSize);
|
|
if (neededInSize==0) { /* end of frame */
|
|
zds->streamStage = zdss_init;
|
|
someMoreWork = 0;
|
|
break;
|
|
}
|
|
if ((size_t)(iend-ip) >= neededInSize) { /* decode directly from src */
|
|
int const isSkipFrame = ZSTD_isSkipFrame(zds);
|
|
size_t const decodedSize = ZSTD_decompressContinue(zds,
|
|
zds->outBuff + zds->outStart, (isSkipFrame ? 0 : zds->outBuffSize - zds->outStart),
|
|
ip, neededInSize);
|
|
if (ZSTD_isError(decodedSize)) return decodedSize;
|
|
ip += neededInSize;
|
|
if (!decodedSize && !isSkipFrame) break; /* this was just a header */
|
|
zds->outEnd = zds->outStart + decodedSize;
|
|
zds->streamStage = zdss_flush;
|
|
break;
|
|
} }
|
|
if (ip==iend) { someMoreWork = 0; break; } /* no more input */
|
|
zds->streamStage = zdss_load;
|
|
/* fall-through */
|
|
|
|
case zdss_load:
|
|
{ size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zds);
|
|
size_t const toLoad = neededInSize - zds->inPos;
|
|
int const isSkipFrame = ZSTD_isSkipFrame(zds);
|
|
size_t loadedSize;
|
|
if (isSkipFrame) {
|
|
loadedSize = MIN(toLoad, (size_t)(iend-ip));
|
|
} else {
|
|
RETURN_ERROR_IF(toLoad > zds->inBuffSize - zds->inPos,
|
|
corruption_detected,
|
|
"should never happen");
|
|
loadedSize = ZSTD_limitCopy(zds->inBuff + zds->inPos, toLoad, ip, iend-ip);
|
|
}
|
|
ip += loadedSize;
|
|
zds->inPos += loadedSize;
|
|
if (loadedSize < toLoad) { someMoreWork = 0; break; } /* not enough input, wait for more */
|
|
|
|
/* decode loaded input */
|
|
{ size_t const decodedSize = ZSTD_decompressContinue(zds,
|
|
zds->outBuff + zds->outStart, zds->outBuffSize - zds->outStart,
|
|
zds->inBuff, neededInSize);
|
|
if (ZSTD_isError(decodedSize)) return decodedSize;
|
|
zds->inPos = 0; /* input is consumed */
|
|
if (!decodedSize && !isSkipFrame) { zds->streamStage = zdss_read; break; } /* this was just a header */
|
|
zds->outEnd = zds->outStart + decodedSize;
|
|
} }
|
|
zds->streamStage = zdss_flush;
|
|
/* fall-through */
|
|
|
|
case zdss_flush:
|
|
{ size_t const toFlushSize = zds->outEnd - zds->outStart;
|
|
size_t const flushedSize = ZSTD_limitCopy(op, oend-op, zds->outBuff + zds->outStart, toFlushSize);
|
|
op += flushedSize;
|
|
zds->outStart += flushedSize;
|
|
if (flushedSize == toFlushSize) { /* flush completed */
|
|
zds->streamStage = zdss_read;
|
|
if ( (zds->outBuffSize < zds->fParams.frameContentSize)
|
|
&& (zds->outStart + zds->fParams.blockSizeMax > zds->outBuffSize) ) {
|
|
DEBUGLOG(5, "restart filling outBuff from beginning (left:%i, needed:%u)",
|
|
(int)(zds->outBuffSize - zds->outStart),
|
|
(U32)zds->fParams.blockSizeMax);
|
|
zds->outStart = zds->outEnd = 0;
|
|
}
|
|
break;
|
|
} }
|
|
/* cannot complete flush */
|
|
someMoreWork = 0;
|
|
break;
|
|
|
|
default:
|
|
assert(0); /* impossible */
|
|
RETURN_ERROR(GENERIC); /* some compiler require default to do something */
|
|
} }
|
|
|
|
/* result */
|
|
input->pos = (size_t)(ip - (const char*)(input->src));
|
|
output->pos = (size_t)(op - (char*)(output->dst));
|
|
if ((ip==istart) && (op==ostart)) { /* no forward progress */
|
|
zds->noForwardProgress ++;
|
|
if (zds->noForwardProgress >= ZSTD_NO_FORWARD_PROGRESS_MAX) {
|
|
RETURN_ERROR_IF(op==oend, dstSize_tooSmall);
|
|
RETURN_ERROR_IF(ip==iend, srcSize_wrong);
|
|
assert(0);
|
|
}
|
|
} else {
|
|
zds->noForwardProgress = 0;
|
|
}
|
|
{ size_t nextSrcSizeHint = ZSTD_nextSrcSizeToDecompress(zds);
|
|
if (!nextSrcSizeHint) { /* frame fully decoded */
|
|
if (zds->outEnd == zds->outStart) { /* output fully flushed */
|
|
if (zds->hostageByte) {
|
|
if (input->pos >= input->size) {
|
|
/* can't release hostage (not present) */
|
|
zds->streamStage = zdss_read;
|
|
return 1;
|
|
}
|
|
input->pos++; /* release hostage */
|
|
} /* zds->hostageByte */
|
|
return 0;
|
|
} /* zds->outEnd == zds->outStart */
|
|
if (!zds->hostageByte) { /* output not fully flushed; keep last byte as hostage; will be released when all output is flushed */
|
|
input->pos--; /* note : pos > 0, otherwise, impossible to finish reading last block */
|
|
zds->hostageByte=1;
|
|
}
|
|
return 1;
|
|
} /* nextSrcSizeHint==0 */
|
|
nextSrcSizeHint += ZSTD_blockHeaderSize * (ZSTD_nextInputType(zds) == ZSTDnit_block); /* preload header of next block */
|
|
assert(zds->inPos <= nextSrcSizeHint);
|
|
nextSrcSizeHint -= zds->inPos; /* part already loaded*/
|
|
return nextSrcSizeHint;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_decompressStream_simpleArgs (
|
|
ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity, size_t* dstPos,
|
|
const void* src, size_t srcSize, size_t* srcPos)
|
|
{
|
|
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_decompressStream(dctx, &output, &input);
|
|
*dstPos = output.pos;
|
|
*srcPos = input.pos;
|
|
return cErr;
|
|
}
|