461f1d8af1
- Import zstd-1.3.6 from upstream - Add zstd's module.c file - Add the zstd module to Makefile.core.def Import zstd-1.3.6 from upstream [1]. Only the files need for decompression are imported. I used the latest zstd release, which includes patches [2] to build cleanly in GRUB. I included the script used to import zstd-1.3.6 below at the bottom of the commit message. Upstream zstd commit hash: 4fa456d7f12f8b27bd3b2f5dfd4f46898cb31c24 Upstream zstd commit name: Merge pull request #1354 from facebook/dev Zstd requires some posix headers, which it gets from posix_wrap. This can be checked by inspecting the .Po files generated by automake, which contain the header dependencies. After building run the command `cat grub-core/lib/zstd/.deps-core/*.Po` to see the dependencies [3]. The only OS dependencies are: - stddef.h, which is already a dependency in posix_wrap, and used for size_t by lzo and xz. - stdarg.h, which comes from the grub/misc.h header, and we don't use in zstd. All the types like uint64_t are typedefed to grub_uint64_t under the hood. The only exception is size_t, which comes from stddef.h. This is already the case for lzo and xz. I don't think there are any cross-compilation concerns, because cross-compilers provide their own system headers (and it would already be broken). [1] https://github.com/facebook/zstd/releases/tag/v1.3.6 [2] https://github.com/facebook/zstd/pull/1344 [3] https://gist.github.com/terrelln/7a16b92f5a1b3aecf980f944b4a966c4 ``` curl -L -O https://github.com/facebook/zstd/releases/download/v1.3.6/zstd-1.3.6.tar.gz curl -L -O https://github.com/facebook/zstd/releases/download/v1.3.6/zstd-1.3.6.tar.gz.sha256 sha256sum --check zstd-1.3.6.tar.gz.sha256 tar xzf zstd-1.3.6.tar.gz SRC_LIB="zstd-1.3.6/lib" DST_LIB="grub-core/lib/zstd" rm -rf $DST_LIB mkdir -p $DST_LIB cp $SRC_LIB/zstd.h $DST_LIB/ cp $SRC_LIB/common/*.[hc] $DST_LIB/ cp $SRC_LIB/decompress/*.[hc] $DST_LIB/ rm $DST_LIB/{pool.[hc],threading.[hc]} rm -rf zstd-1.3.6* echo SUCCESS! ``` Signed-off-by: Nick Terrell <terrelln@fb.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
3108 lines
128 KiB
C
3108 lines
128 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_DEFAULTMAX) + 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() and ZSTD_decompress_generic()
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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 "compiler.h" /* prefetch */
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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"
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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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static const void* ZSTD_DDictDictContent(const ZSTD_DDict* ddict);
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static size_t ZSTD_DDictDictSize(const ZSTD_DDict* ddict);
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/*-*************************************
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* Errors
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***************************************/
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#define ZSTD_isError ERR_isError /* for inlining */
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#define FSE_isError ERR_isError
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#define HUF_isError ERR_isError
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/*_*******************************************************
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* Memory operations
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**********************************************************/
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static void ZSTD_copy4(void* dst, const void* src) { memcpy(dst, src, 4); }
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/*-*************************************************************
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* Context management
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***************************************************************/
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typedef enum { ZSTDds_getFrameHeaderSize, ZSTDds_decodeFrameHeader,
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ZSTDds_decodeBlockHeader, ZSTDds_decompressBlock,
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ZSTDds_decompressLastBlock, ZSTDds_checkChecksum,
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ZSTDds_decodeSkippableHeader, ZSTDds_skipFrame } ZSTD_dStage;
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typedef enum { zdss_init=0, zdss_loadHeader,
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zdss_read, zdss_load, zdss_flush } ZSTD_dStreamStage;
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typedef struct {
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U32 fastMode;
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U32 tableLog;
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} ZSTD_seqSymbol_header;
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typedef struct {
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U16 nextState;
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BYTE nbAdditionalBits;
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BYTE nbBits;
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U32 baseValue;
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} ZSTD_seqSymbol;
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#define SEQSYMBOL_TABLE_SIZE(log) (1 + (1 << (log)))
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typedef struct {
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ZSTD_seqSymbol LLTable[SEQSYMBOL_TABLE_SIZE(LLFSELog)]; /* Note : Space reserved for FSE Tables */
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ZSTD_seqSymbol OFTable[SEQSYMBOL_TABLE_SIZE(OffFSELog)]; /* is also used as temporary workspace while building hufTable during DDict creation */
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ZSTD_seqSymbol MLTable[SEQSYMBOL_TABLE_SIZE(MLFSELog)]; /* and therefore must be at least HUF_DECOMPRESS_WORKSPACE_SIZE large */
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HUF_DTable hufTable[HUF_DTABLE_SIZE(HufLog)]; /* can accommodate HUF_decompress4X */
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U32 rep[ZSTD_REP_NUM];
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} ZSTD_entropyDTables_t;
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struct ZSTD_DCtx_s
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{
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const ZSTD_seqSymbol* LLTptr;
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const ZSTD_seqSymbol* MLTptr;
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const ZSTD_seqSymbol* OFTptr;
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const HUF_DTable* HUFptr;
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ZSTD_entropyDTables_t entropy;
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U32 workspace[HUF_DECOMPRESS_WORKSPACE_SIZE_U32]; /* space needed when building huffman tables */
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const void* previousDstEnd; /* detect continuity */
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const void* prefixStart; /* start of current segment */
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const void* virtualStart; /* virtual start of previous segment if it was just before current one */
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const void* dictEnd; /* end of previous segment */
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size_t expected;
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ZSTD_frameHeader fParams;
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U64 decodedSize;
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blockType_e bType; /* used in ZSTD_decompressContinue(), store blockType between block header decoding and block decompression stages */
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ZSTD_dStage stage;
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U32 litEntropy;
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U32 fseEntropy;
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XXH64_state_t xxhState;
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size_t headerSize;
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ZSTD_format_e format;
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const BYTE* litPtr;
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ZSTD_customMem customMem;
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size_t litSize;
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size_t rleSize;
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size_t staticSize;
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int bmi2; /* == 1 if the CPU supports BMI2 and 0 otherwise. CPU support is determined dynamically once per context lifetime. */
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/* dictionary */
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ZSTD_DDict* ddictLocal;
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const ZSTD_DDict* ddict; /* set by ZSTD_initDStream_usingDDict(), or ZSTD_DCtx_refDDict() */
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U32 dictID;
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int ddictIsCold; /* if == 1 : dictionary is "new" for working context, and presumed "cold" (not in cpu cache) */
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/* streaming */
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ZSTD_dStreamStage streamStage;
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char* inBuff;
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size_t inBuffSize;
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size_t inPos;
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size_t maxWindowSize;
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char* outBuff;
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size_t outBuffSize;
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size_t outStart;
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size_t outEnd;
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size_t lhSize;
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void* legacyContext;
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U32 previousLegacyVersion;
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U32 legacyVersion;
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U32 hostageByte;
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int noForwardProgress;
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/* workspace */
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BYTE litBuffer[ZSTD_BLOCKSIZE_MAX + WILDCOPY_OVERLENGTH];
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BYTE headerBuffer[ZSTD_FRAMEHEADERSIZE_MAX];
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}; /* typedef'd to ZSTD_DCtx within "zstd.h" */
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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->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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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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if (dctx->staticSize) return ERROR(memory_allocation); /* not compatible with static DCtx */
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{ ZSTD_customMem const cMem = dctx->customMem;
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ZSTD_freeDDict(dctx->ddictLocal);
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dctx->ddictLocal = NULL;
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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 & 0xFFFFFFF0U) == 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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if (srcSize < minInputSize) return ERROR(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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if (src==NULL) return ERROR(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) & 0xFFFFFFF0U) == 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;
|
|
U32 dictID = 0;
|
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U64 frameContentSize = ZSTD_CONTENTSIZE_UNKNOWN;
|
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if ((fhdByte & 0x08) != 0)
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return ERROR(frameParameter_unsupported); /* reserved bits, must be zero */
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|
|
if (!singleSegment) {
|
|
BYTE const wlByte = ip[pos++];
|
|
U32 const windowLog = (wlByte >> 3) + ZSTD_WINDOWLOG_ABSOLUTEMIN;
|
|
if (windowLog > ZSTD_WINDOWLOG_MAX)
|
|
return ERROR(frameParameter_windowTooLarge);
|
|
windowSize = (1ULL << windowLog);
|
|
windowSize += (windowSize >> 3) * (wlByte&7);
|
|
}
|
|
switch(dictIDSizeCode)
|
|
{
|
|
default: assert(0); /* impossible */
|
|
case 0 : break;
|
|
case 1 : dictID = ip[pos]; pos++; break;
|
|
case 2 : dictID = MEM_readLE16(ip+pos); pos+=2; break;
|
|
case 3 : dictID = MEM_readLE32(ip+pos); pos+=4; break;
|
|
}
|
|
switch(fcsID)
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|
{
|
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default: assert(0); /* impossible */
|
|
case 0 : if (singleSegment) frameContentSize = ip[pos]; break;
|
|
case 1 : frameContentSize = MEM_readLE16(ip+pos)+256; break;
|
|
case 2 : frameContentSize = MEM_readLE32(ip+pos); break;
|
|
case 3 : frameContentSize = MEM_readLE64(ip+pos); break;
|
|
}
|
|
if (singleSegment) windowSize = frameContentSize;
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|
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zfhPtr->frameType = ZSTD_frame;
|
|
zfhPtr->frameContentSize = frameContentSize;
|
|
zfhPtr->windowSize = windowSize;
|
|
zfhPtr->blockSizeMax = (unsigned) MIN(windowSize, ZSTD_BLOCKSIZE_MAX);
|
|
zfhPtr->dictID = dictID;
|
|
zfhPtr->checksumFlag = checksumFlag;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** ZSTD_getFrameHeader() :
|
|
* decode Frame Header, or require larger `srcSize`.
|
|
* note : this function does not consume input, it only reads it.
|
|
* @return : 0, `zfhPtr` is correctly filled,
|
|
* >0, `srcSize` is too small, value is wanted `srcSize` amount,
|
|
* or an error code, which can be tested using ZSTD_isError() */
|
|
size_t ZSTD_getFrameHeader(ZSTD_frameHeader* zfhPtr, const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_getFrameHeader_advanced(zfhPtr, src, srcSize, ZSTD_f_zstd1);
|
|
}
|
|
|
|
|
|
/** ZSTD_getFrameContentSize() :
|
|
* compatible with legacy mode
|
|
* @return : decompressed size of the single frame pointed to be `src` if known, otherwise
|
|
* - ZSTD_CONTENTSIZE_UNKNOWN if the size cannot be determined
|
|
* - ZSTD_CONTENTSIZE_ERROR if an error occurred (e.g. invalid magic number, srcSize too small) */
|
|
unsigned long long ZSTD_getFrameContentSize(const void *src, size_t srcSize)
|
|
{
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
|
|
if (ZSTD_isLegacy(src, srcSize)) {
|
|
unsigned long long const ret = ZSTD_getDecompressedSize_legacy(src, srcSize);
|
|
return ret == 0 ? ZSTD_CONTENTSIZE_UNKNOWN : ret;
|
|
}
|
|
#endif
|
|
{ ZSTD_frameHeader zfh;
|
|
if (ZSTD_getFrameHeader(&zfh, src, srcSize) != 0)
|
|
return ZSTD_CONTENTSIZE_ERROR;
|
|
if (zfh.frameType == ZSTD_skippableFrame) {
|
|
return 0;
|
|
} else {
|
|
return zfh.frameContentSize;
|
|
} }
|
|
}
|
|
|
|
/** ZSTD_findDecompressedSize() :
|
|
* compatible with legacy mode
|
|
* `srcSize` must be the exact length of some number of ZSTD compressed and/or
|
|
* skippable frames
|
|
* @return : decompressed size of the frames contained */
|
|
unsigned long long ZSTD_findDecompressedSize(const void* src, size_t srcSize)
|
|
{
|
|
unsigned long long totalDstSize = 0;
|
|
|
|
while (srcSize >= ZSTD_frameHeaderSize_prefix) {
|
|
U32 const magicNumber = MEM_readLE32(src);
|
|
|
|
if ((magicNumber & 0xFFFFFFF0U) == ZSTD_MAGIC_SKIPPABLE_START) {
|
|
size_t skippableSize;
|
|
if (srcSize < ZSTD_skippableHeaderSize)
|
|
return ERROR(srcSize_wrong);
|
|
skippableSize = MEM_readLE32((const BYTE *)src + ZSTD_FRAMEIDSIZE)
|
|
+ ZSTD_skippableHeaderSize;
|
|
if (srcSize < skippableSize) {
|
|
return ZSTD_CONTENTSIZE_ERROR;
|
|
}
|
|
|
|
src = (const BYTE *)src + skippableSize;
|
|
srcSize -= skippableSize;
|
|
continue;
|
|
}
|
|
|
|
{ unsigned long long const ret = ZSTD_getFrameContentSize(src, srcSize);
|
|
if (ret >= ZSTD_CONTENTSIZE_ERROR) return ret;
|
|
|
|
/* check for overflow */
|
|
if (totalDstSize + ret < totalDstSize) return ZSTD_CONTENTSIZE_ERROR;
|
|
totalDstSize += ret;
|
|
}
|
|
{ size_t const frameSrcSize = ZSTD_findFrameCompressedSize(src, srcSize);
|
|
if (ZSTD_isError(frameSrcSize)) {
|
|
return ZSTD_CONTENTSIZE_ERROR;
|
|
}
|
|
|
|
src = (const BYTE *)src + frameSrcSize;
|
|
srcSize -= frameSrcSize;
|
|
}
|
|
} /* while (srcSize >= ZSTD_frameHeaderSize_prefix) */
|
|
|
|
if (srcSize) return ZSTD_CONTENTSIZE_ERROR;
|
|
|
|
return totalDstSize;
|
|
}
|
|
|
|
/** ZSTD_getDecompressedSize() :
|
|
* compatible with legacy mode
|
|
* @return : decompressed size if known, 0 otherwise
|
|
note : 0 can mean any of the following :
|
|
- frame content is empty
|
|
- decompressed size field is not present in frame header
|
|
- frame header unknown / not supported
|
|
- frame header not complete (`srcSize` too small) */
|
|
unsigned long long ZSTD_getDecompressedSize(const void* src, size_t srcSize)
|
|
{
|
|
unsigned long long const ret = ZSTD_getFrameContentSize(src, srcSize);
|
|
ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_ERROR < ZSTD_CONTENTSIZE_UNKNOWN);
|
|
return (ret >= ZSTD_CONTENTSIZE_ERROR) ? 0 : ret;
|
|
}
|
|
|
|
|
|
/** ZSTD_decodeFrameHeader() :
|
|
* `headerSize` must be the size provided by ZSTD_frameHeaderSize().
|
|
* @return : 0 if success, or an error code, which can be tested using ZSTD_isError() */
|
|
static size_t ZSTD_decodeFrameHeader(ZSTD_DCtx* dctx, const void* src, size_t headerSize)
|
|
{
|
|
size_t const result = ZSTD_getFrameHeader_advanced(&(dctx->fParams), src, headerSize, dctx->format);
|
|
if (ZSTD_isError(result)) return result; /* invalid header */
|
|
if (result>0) return ERROR(srcSize_wrong); /* headerSize too small */
|
|
if (dctx->fParams.dictID && (dctx->dictID != dctx->fParams.dictID))
|
|
return ERROR(dictionary_wrong);
|
|
if (dctx->fParams.checksumFlag) XXH64_reset(&dctx->xxhState, 0);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*-*************************************************************
|
|
* Block decoding
|
|
***************************************************************/
|
|
|
|
/*! ZSTD_getcBlockSize() :
|
|
* Provides the size of compressed block from block header `src` */
|
|
size_t ZSTD_getcBlockSize(const void* src, size_t srcSize,
|
|
blockProperties_t* bpPtr)
|
|
{
|
|
if (srcSize < ZSTD_blockHeaderSize) return ERROR(srcSize_wrong);
|
|
{ U32 const cBlockHeader = MEM_readLE24(src);
|
|
U32 const cSize = cBlockHeader >> 3;
|
|
bpPtr->lastBlock = cBlockHeader & 1;
|
|
bpPtr->blockType = (blockType_e)((cBlockHeader >> 1) & 3);
|
|
bpPtr->origSize = cSize; /* only useful for RLE */
|
|
if (bpPtr->blockType == bt_rle) return 1;
|
|
if (bpPtr->blockType == bt_reserved) return ERROR(corruption_detected);
|
|
return cSize;
|
|
}
|
|
}
|
|
|
|
|
|
static size_t ZSTD_copyRawBlock(void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
if (dst==NULL) return ERROR(dstSize_tooSmall);
|
|
if (srcSize > dstCapacity) return ERROR(dstSize_tooSmall);
|
|
memcpy(dst, src, srcSize);
|
|
return srcSize;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_setRleBlock(void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
size_t regenSize)
|
|
{
|
|
if (srcSize != 1) return ERROR(srcSize_wrong);
|
|
if (regenSize > dstCapacity) return ERROR(dstSize_tooSmall);
|
|
memset(dst, *(const BYTE*)src, regenSize);
|
|
return regenSize;
|
|
}
|
|
|
|
/* Hidden declaration for fullbench */
|
|
size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx,
|
|
const void* src, size_t srcSize);
|
|
/*! ZSTD_decodeLiteralsBlock() :
|
|
* @return : nb of bytes read from src (< srcSize )
|
|
* note : symbol not declared but exposed for fullbench */
|
|
size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx,
|
|
const void* src, size_t srcSize) /* note : srcSize < BLOCKSIZE */
|
|
{
|
|
if (srcSize < MIN_CBLOCK_SIZE) return ERROR(corruption_detected);
|
|
|
|
{ const BYTE* const istart = (const BYTE*) src;
|
|
symbolEncodingType_e const litEncType = (symbolEncodingType_e)(istart[0] & 3);
|
|
|
|
switch(litEncType)
|
|
{
|
|
case set_repeat:
|
|
if (dctx->litEntropy==0) return ERROR(dictionary_corrupted);
|
|
/* fall-through */
|
|
|
|
case set_compressed:
|
|
if (srcSize < 5) return ERROR(corruption_detected); /* srcSize >= MIN_CBLOCK_SIZE == 3; here we need up to 5 for case 3 */
|
|
{ size_t lhSize, litSize, litCSize;
|
|
U32 singleStream=0;
|
|
U32 const lhlCode = (istart[0] >> 2) & 3;
|
|
U32 const lhc = MEM_readLE32(istart);
|
|
switch(lhlCode)
|
|
{
|
|
case 0: case 1: default: /* note : default is impossible, since lhlCode into [0..3] */
|
|
/* 2 - 2 - 10 - 10 */
|
|
singleStream = !lhlCode;
|
|
lhSize = 3;
|
|
litSize = (lhc >> 4) & 0x3FF;
|
|
litCSize = (lhc >> 14) & 0x3FF;
|
|
break;
|
|
case 2:
|
|
/* 2 - 2 - 14 - 14 */
|
|
lhSize = 4;
|
|
litSize = (lhc >> 4) & 0x3FFF;
|
|
litCSize = lhc >> 18;
|
|
break;
|
|
case 3:
|
|
/* 2 - 2 - 18 - 18 */
|
|
lhSize = 5;
|
|
litSize = (lhc >> 4) & 0x3FFFF;
|
|
litCSize = (lhc >> 22) + (istart[4] << 10);
|
|
break;
|
|
}
|
|
if (litSize > ZSTD_BLOCKSIZE_MAX) return ERROR(corruption_detected);
|
|
if (litCSize + lhSize > srcSize) return ERROR(corruption_detected);
|
|
|
|
/* prefetch huffman table if cold */
|
|
if (dctx->ddictIsCold && (litSize > 768 /* heuristic */)) {
|
|
PREFETCH_AREA(dctx->HUFptr, sizeof(dctx->entropy.hufTable));
|
|
}
|
|
|
|
if (HUF_isError((litEncType==set_repeat) ?
|
|
( singleStream ?
|
|
HUF_decompress1X_usingDTable_bmi2(dctx->litBuffer, litSize, istart+lhSize, litCSize, dctx->HUFptr, dctx->bmi2) :
|
|
HUF_decompress4X_usingDTable_bmi2(dctx->litBuffer, litSize, istart+lhSize, litCSize, dctx->HUFptr, dctx->bmi2) ) :
|
|
( singleStream ?
|
|
HUF_decompress1X1_DCtx_wksp_bmi2(dctx->entropy.hufTable, dctx->litBuffer, litSize, istart+lhSize, litCSize,
|
|
dctx->workspace, sizeof(dctx->workspace), dctx->bmi2) :
|
|
HUF_decompress4X_hufOnly_wksp_bmi2(dctx->entropy.hufTable, dctx->litBuffer, litSize, istart+lhSize, litCSize,
|
|
dctx->workspace, sizeof(dctx->workspace), dctx->bmi2))))
|
|
return ERROR(corruption_detected);
|
|
|
|
dctx->litPtr = dctx->litBuffer;
|
|
dctx->litSize = litSize;
|
|
dctx->litEntropy = 1;
|
|
if (litEncType==set_compressed) dctx->HUFptr = dctx->entropy.hufTable;
|
|
memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH);
|
|
return litCSize + lhSize;
|
|
}
|
|
|
|
case set_basic:
|
|
{ size_t litSize, lhSize;
|
|
U32 const lhlCode = ((istart[0]) >> 2) & 3;
|
|
switch(lhlCode)
|
|
{
|
|
case 0: case 2: default: /* note : default is impossible, since lhlCode into [0..3] */
|
|
lhSize = 1;
|
|
litSize = istart[0] >> 3;
|
|
break;
|
|
case 1:
|
|
lhSize = 2;
|
|
litSize = MEM_readLE16(istart) >> 4;
|
|
break;
|
|
case 3:
|
|
lhSize = 3;
|
|
litSize = MEM_readLE24(istart) >> 4;
|
|
break;
|
|
}
|
|
|
|
if (lhSize+litSize+WILDCOPY_OVERLENGTH > srcSize) { /* risk reading beyond src buffer with wildcopy */
|
|
if (litSize+lhSize > srcSize) return ERROR(corruption_detected);
|
|
memcpy(dctx->litBuffer, istart+lhSize, litSize);
|
|
dctx->litPtr = dctx->litBuffer;
|
|
dctx->litSize = litSize;
|
|
memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH);
|
|
return lhSize+litSize;
|
|
}
|
|
/* direct reference into compressed stream */
|
|
dctx->litPtr = istart+lhSize;
|
|
dctx->litSize = litSize;
|
|
return lhSize+litSize;
|
|
}
|
|
|
|
case set_rle:
|
|
{ U32 const lhlCode = ((istart[0]) >> 2) & 3;
|
|
size_t litSize, lhSize;
|
|
switch(lhlCode)
|
|
{
|
|
case 0: case 2: default: /* note : default is impossible, since lhlCode into [0..3] */
|
|
lhSize = 1;
|
|
litSize = istart[0] >> 3;
|
|
break;
|
|
case 1:
|
|
lhSize = 2;
|
|
litSize = MEM_readLE16(istart) >> 4;
|
|
break;
|
|
case 3:
|
|
lhSize = 3;
|
|
litSize = MEM_readLE24(istart) >> 4;
|
|
if (srcSize<4) return ERROR(corruption_detected); /* srcSize >= MIN_CBLOCK_SIZE == 3; here we need lhSize+1 = 4 */
|
|
break;
|
|
}
|
|
if (litSize > ZSTD_BLOCKSIZE_MAX) return ERROR(corruption_detected);
|
|
memset(dctx->litBuffer, istart[lhSize], litSize + WILDCOPY_OVERLENGTH);
|
|
dctx->litPtr = dctx->litBuffer;
|
|
dctx->litSize = litSize;
|
|
return lhSize+1;
|
|
}
|
|
default:
|
|
return ERROR(corruption_detected); /* impossible */
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Default FSE distribution tables.
|
|
* These are pre-calculated FSE decoding tables using default distributions as defined in specification :
|
|
* https://github.com/facebook/zstd/blob/master/doc/zstd_compression_format.md#default-distributions
|
|
* They were generated programmatically with following method :
|
|
* - start from default distributions, present in /lib/common/zstd_internal.h
|
|
* - generate tables normally, using ZSTD_buildFSETable()
|
|
* - printout the content of tables
|
|
* - pretify output, report below, test with fuzzer to ensure it's correct */
|
|
|
|
/* Default FSE distribution table for Literal Lengths */
|
|
static const ZSTD_seqSymbol LL_defaultDTable[(1<<LL_DEFAULTNORMLOG)+1] = {
|
|
{ 1, 1, 1, LL_DEFAULTNORMLOG}, /* header : fastMode, tableLog */
|
|
/* nextState, nbAddBits, nbBits, baseVal */
|
|
{ 0, 0, 4, 0}, { 16, 0, 4, 0},
|
|
{ 32, 0, 5, 1}, { 0, 0, 5, 3},
|
|
{ 0, 0, 5, 4}, { 0, 0, 5, 6},
|
|
{ 0, 0, 5, 7}, { 0, 0, 5, 9},
|
|
{ 0, 0, 5, 10}, { 0, 0, 5, 12},
|
|
{ 0, 0, 6, 14}, { 0, 1, 5, 16},
|
|
{ 0, 1, 5, 20}, { 0, 1, 5, 22},
|
|
{ 0, 2, 5, 28}, { 0, 3, 5, 32},
|
|
{ 0, 4, 5, 48}, { 32, 6, 5, 64},
|
|
{ 0, 7, 5, 128}, { 0, 8, 6, 256},
|
|
{ 0, 10, 6, 1024}, { 0, 12, 6, 4096},
|
|
{ 32, 0, 4, 0}, { 0, 0, 4, 1},
|
|
{ 0, 0, 5, 2}, { 32, 0, 5, 4},
|
|
{ 0, 0, 5, 5}, { 32, 0, 5, 7},
|
|
{ 0, 0, 5, 8}, { 32, 0, 5, 10},
|
|
{ 0, 0, 5, 11}, { 0, 0, 6, 13},
|
|
{ 32, 1, 5, 16}, { 0, 1, 5, 18},
|
|
{ 32, 1, 5, 22}, { 0, 2, 5, 24},
|
|
{ 32, 3, 5, 32}, { 0, 3, 5, 40},
|
|
{ 0, 6, 4, 64}, { 16, 6, 4, 64},
|
|
{ 32, 7, 5, 128}, { 0, 9, 6, 512},
|
|
{ 0, 11, 6, 2048}, { 48, 0, 4, 0},
|
|
{ 16, 0, 4, 1}, { 32, 0, 5, 2},
|
|
{ 32, 0, 5, 3}, { 32, 0, 5, 5},
|
|
{ 32, 0, 5, 6}, { 32, 0, 5, 8},
|
|
{ 32, 0, 5, 9}, { 32, 0, 5, 11},
|
|
{ 32, 0, 5, 12}, { 0, 0, 6, 15},
|
|
{ 32, 1, 5, 18}, { 32, 1, 5, 20},
|
|
{ 32, 2, 5, 24}, { 32, 2, 5, 28},
|
|
{ 32, 3, 5, 40}, { 32, 4, 5, 48},
|
|
{ 0, 16, 6,65536}, { 0, 15, 6,32768},
|
|
{ 0, 14, 6,16384}, { 0, 13, 6, 8192},
|
|
}; /* LL_defaultDTable */
|
|
|
|
/* Default FSE distribution table for Offset Codes */
|
|
static const ZSTD_seqSymbol OF_defaultDTable[(1<<OF_DEFAULTNORMLOG)+1] = {
|
|
{ 1, 1, 1, OF_DEFAULTNORMLOG}, /* header : fastMode, tableLog */
|
|
/* nextState, nbAddBits, nbBits, baseVal */
|
|
{ 0, 0, 5, 0}, { 0, 6, 4, 61},
|
|
{ 0, 9, 5, 509}, { 0, 15, 5,32765},
|
|
{ 0, 21, 5,2097149}, { 0, 3, 5, 5},
|
|
{ 0, 7, 4, 125}, { 0, 12, 5, 4093},
|
|
{ 0, 18, 5,262141}, { 0, 23, 5,8388605},
|
|
{ 0, 5, 5, 29}, { 0, 8, 4, 253},
|
|
{ 0, 14, 5,16381}, { 0, 20, 5,1048573},
|
|
{ 0, 2, 5, 1}, { 16, 7, 4, 125},
|
|
{ 0, 11, 5, 2045}, { 0, 17, 5,131069},
|
|
{ 0, 22, 5,4194301}, { 0, 4, 5, 13},
|
|
{ 16, 8, 4, 253}, { 0, 13, 5, 8189},
|
|
{ 0, 19, 5,524285}, { 0, 1, 5, 1},
|
|
{ 16, 6, 4, 61}, { 0, 10, 5, 1021},
|
|
{ 0, 16, 5,65533}, { 0, 28, 5,268435453},
|
|
{ 0, 27, 5,134217725}, { 0, 26, 5,67108861},
|
|
{ 0, 25, 5,33554429}, { 0, 24, 5,16777213},
|
|
}; /* OF_defaultDTable */
|
|
|
|
|
|
/* Default FSE distribution table for Match Lengths */
|
|
static const ZSTD_seqSymbol ML_defaultDTable[(1<<ML_DEFAULTNORMLOG)+1] = {
|
|
{ 1, 1, 1, ML_DEFAULTNORMLOG}, /* header : fastMode, tableLog */
|
|
/* nextState, nbAddBits, nbBits, baseVal */
|
|
{ 0, 0, 6, 3}, { 0, 0, 4, 4},
|
|
{ 32, 0, 5, 5}, { 0, 0, 5, 6},
|
|
{ 0, 0, 5, 8}, { 0, 0, 5, 9},
|
|
{ 0, 0, 5, 11}, { 0, 0, 6, 13},
|
|
{ 0, 0, 6, 16}, { 0, 0, 6, 19},
|
|
{ 0, 0, 6, 22}, { 0, 0, 6, 25},
|
|
{ 0, 0, 6, 28}, { 0, 0, 6, 31},
|
|
{ 0, 0, 6, 34}, { 0, 1, 6, 37},
|
|
{ 0, 1, 6, 41}, { 0, 2, 6, 47},
|
|
{ 0, 3, 6, 59}, { 0, 4, 6, 83},
|
|
{ 0, 7, 6, 131}, { 0, 9, 6, 515},
|
|
{ 16, 0, 4, 4}, { 0, 0, 4, 5},
|
|
{ 32, 0, 5, 6}, { 0, 0, 5, 7},
|
|
{ 32, 0, 5, 9}, { 0, 0, 5, 10},
|
|
{ 0, 0, 6, 12}, { 0, 0, 6, 15},
|
|
{ 0, 0, 6, 18}, { 0, 0, 6, 21},
|
|
{ 0, 0, 6, 24}, { 0, 0, 6, 27},
|
|
{ 0, 0, 6, 30}, { 0, 0, 6, 33},
|
|
{ 0, 1, 6, 35}, { 0, 1, 6, 39},
|
|
{ 0, 2, 6, 43}, { 0, 3, 6, 51},
|
|
{ 0, 4, 6, 67}, { 0, 5, 6, 99},
|
|
{ 0, 8, 6, 259}, { 32, 0, 4, 4},
|
|
{ 48, 0, 4, 4}, { 16, 0, 4, 5},
|
|
{ 32, 0, 5, 7}, { 32, 0, 5, 8},
|
|
{ 32, 0, 5, 10}, { 32, 0, 5, 11},
|
|
{ 0, 0, 6, 14}, { 0, 0, 6, 17},
|
|
{ 0, 0, 6, 20}, { 0, 0, 6, 23},
|
|
{ 0, 0, 6, 26}, { 0, 0, 6, 29},
|
|
{ 0, 0, 6, 32}, { 0, 16, 6,65539},
|
|
{ 0, 15, 6,32771}, { 0, 14, 6,16387},
|
|
{ 0, 13, 6, 8195}, { 0, 12, 6, 4099},
|
|
{ 0, 11, 6, 2051}, { 0, 10, 6, 1027},
|
|
}; /* ML_defaultDTable */
|
|
|
|
|
|
static void ZSTD_buildSeqTable_rle(ZSTD_seqSymbol* dt, U32 baseValue, U32 nbAddBits)
|
|
{
|
|
void* ptr = dt;
|
|
ZSTD_seqSymbol_header* const DTableH = (ZSTD_seqSymbol_header*)ptr;
|
|
ZSTD_seqSymbol* const cell = dt + 1;
|
|
|
|
DTableH->tableLog = 0;
|
|
DTableH->fastMode = 0;
|
|
|
|
cell->nbBits = 0;
|
|
cell->nextState = 0;
|
|
assert(nbAddBits < 255);
|
|
cell->nbAdditionalBits = (BYTE)nbAddBits;
|
|
cell->baseValue = baseValue;
|
|
}
|
|
|
|
|
|
/* ZSTD_buildFSETable() :
|
|
* generate FSE decoding table for one symbol (ll, ml or off) */
|
|
static void
|
|
ZSTD_buildFSETable(ZSTD_seqSymbol* dt,
|
|
const short* normalizedCounter, unsigned maxSymbolValue,
|
|
const U32* baseValue, const U32* nbAdditionalBits,
|
|
unsigned tableLog)
|
|
{
|
|
ZSTD_seqSymbol* const tableDecode = dt+1;
|
|
U16 symbolNext[MaxSeq+1];
|
|
|
|
U32 const maxSV1 = maxSymbolValue + 1;
|
|
U32 const tableSize = 1 << tableLog;
|
|
U32 highThreshold = tableSize-1;
|
|
|
|
/* Sanity Checks */
|
|
assert(maxSymbolValue <= MaxSeq);
|
|
assert(tableLog <= MaxFSELog);
|
|
|
|
/* Init, lay down lowprob symbols */
|
|
{ ZSTD_seqSymbol_header DTableH;
|
|
DTableH.tableLog = tableLog;
|
|
DTableH.fastMode = 1;
|
|
{ S16 const largeLimit= (S16)(1 << (tableLog-1));
|
|
U32 s;
|
|
for (s=0; s<maxSV1; s++) {
|
|
if (normalizedCounter[s]==-1) {
|
|
tableDecode[highThreshold--].baseValue = s;
|
|
symbolNext[s] = 1;
|
|
} else {
|
|
if (normalizedCounter[s] >= largeLimit) DTableH.fastMode=0;
|
|
symbolNext[s] = normalizedCounter[s];
|
|
} } }
|
|
memcpy(dt, &DTableH, sizeof(DTableH));
|
|
}
|
|
|
|
/* Spread symbols */
|
|
{ U32 const tableMask = tableSize-1;
|
|
U32 const step = FSE_TABLESTEP(tableSize);
|
|
U32 s, position = 0;
|
|
for (s=0; s<maxSV1; s++) {
|
|
int i;
|
|
for (i=0; i<normalizedCounter[s]; i++) {
|
|
tableDecode[position].baseValue = s;
|
|
position = (position + step) & tableMask;
|
|
while (position > highThreshold) position = (position + step) & tableMask; /* lowprob area */
|
|
} }
|
|
assert(position == 0); /* position must reach all cells once, otherwise normalizedCounter is incorrect */
|
|
}
|
|
|
|
/* Build Decoding table */
|
|
{ U32 u;
|
|
for (u=0; u<tableSize; u++) {
|
|
U32 const symbol = tableDecode[u].baseValue;
|
|
U32 const nextState = symbolNext[symbol]++;
|
|
tableDecode[u].nbBits = (BYTE) (tableLog - BIT_highbit32(nextState) );
|
|
tableDecode[u].nextState = (U16) ( (nextState << tableDecode[u].nbBits) - tableSize);
|
|
assert(nbAdditionalBits[symbol] < 255);
|
|
tableDecode[u].nbAdditionalBits = (BYTE)nbAdditionalBits[symbol];
|
|
tableDecode[u].baseValue = baseValue[symbol];
|
|
} }
|
|
}
|
|
|
|
|
|
/*! ZSTD_buildSeqTable() :
|
|
* @return : nb bytes read from src,
|
|
* or an error code if it fails */
|
|
static size_t ZSTD_buildSeqTable(ZSTD_seqSymbol* DTableSpace, const ZSTD_seqSymbol** DTablePtr,
|
|
symbolEncodingType_e type, U32 max, U32 maxLog,
|
|
const void* src, size_t srcSize,
|
|
const U32* baseValue, const U32* nbAdditionalBits,
|
|
const ZSTD_seqSymbol* defaultTable, U32 flagRepeatTable,
|
|
int ddictIsCold, int nbSeq)
|
|
{
|
|
switch(type)
|
|
{
|
|
case set_rle :
|
|
if (!srcSize) return ERROR(srcSize_wrong);
|
|
if ( (*(const BYTE*)src) > max) return ERROR(corruption_detected);
|
|
{ U32 const symbol = *(const BYTE*)src;
|
|
U32 const baseline = baseValue[symbol];
|
|
U32 const nbBits = nbAdditionalBits[symbol];
|
|
ZSTD_buildSeqTable_rle(DTableSpace, baseline, nbBits);
|
|
}
|
|
*DTablePtr = DTableSpace;
|
|
return 1;
|
|
case set_basic :
|
|
*DTablePtr = defaultTable;
|
|
return 0;
|
|
case set_repeat:
|
|
if (!flagRepeatTable) return ERROR(corruption_detected);
|
|
/* prefetch FSE table if used */
|
|
if (ddictIsCold && (nbSeq > 24 /* heuristic */)) {
|
|
const void* const pStart = *DTablePtr;
|
|
size_t const pSize = sizeof(ZSTD_seqSymbol) * (SEQSYMBOL_TABLE_SIZE(maxLog));
|
|
PREFETCH_AREA(pStart, pSize);
|
|
}
|
|
return 0;
|
|
case set_compressed :
|
|
{ U32 tableLog;
|
|
S16 norm[MaxSeq+1];
|
|
size_t const headerSize = FSE_readNCount(norm, &max, &tableLog, src, srcSize);
|
|
if (FSE_isError(headerSize)) return ERROR(corruption_detected);
|
|
if (tableLog > maxLog) return ERROR(corruption_detected);
|
|
ZSTD_buildFSETable(DTableSpace, norm, max, baseValue, nbAdditionalBits, tableLog);
|
|
*DTablePtr = DTableSpace;
|
|
return headerSize;
|
|
}
|
|
default : /* impossible */
|
|
assert(0);
|
|
return ERROR(GENERIC);
|
|
}
|
|
}
|
|
|
|
static const U32 LL_base[MaxLL+1] = {
|
|
0, 1, 2, 3, 4, 5, 6, 7,
|
|
8, 9, 10, 11, 12, 13, 14, 15,
|
|
16, 18, 20, 22, 24, 28, 32, 40,
|
|
48, 64, 0x80, 0x100, 0x200, 0x400, 0x800, 0x1000,
|
|
0x2000, 0x4000, 0x8000, 0x10000 };
|
|
|
|
static const U32 OF_base[MaxOff+1] = {
|
|
0, 1, 1, 5, 0xD, 0x1D, 0x3D, 0x7D,
|
|
0xFD, 0x1FD, 0x3FD, 0x7FD, 0xFFD, 0x1FFD, 0x3FFD, 0x7FFD,
|
|
0xFFFD, 0x1FFFD, 0x3FFFD, 0x7FFFD, 0xFFFFD, 0x1FFFFD, 0x3FFFFD, 0x7FFFFD,
|
|
0xFFFFFD, 0x1FFFFFD, 0x3FFFFFD, 0x7FFFFFD, 0xFFFFFFD, 0x1FFFFFFD, 0x3FFFFFFD, 0x7FFFFFFD };
|
|
|
|
static const U32 OF_bits[MaxOff+1] = {
|
|
0, 1, 2, 3, 4, 5, 6, 7,
|
|
8, 9, 10, 11, 12, 13, 14, 15,
|
|
16, 17, 18, 19, 20, 21, 22, 23,
|
|
24, 25, 26, 27, 28, 29, 30, 31 };
|
|
|
|
static const U32 ML_base[MaxML+1] = {
|
|
3, 4, 5, 6, 7, 8, 9, 10,
|
|
11, 12, 13, 14, 15, 16, 17, 18,
|
|
19, 20, 21, 22, 23, 24, 25, 26,
|
|
27, 28, 29, 30, 31, 32, 33, 34,
|
|
35, 37, 39, 41, 43, 47, 51, 59,
|
|
67, 83, 99, 0x83, 0x103, 0x203, 0x403, 0x803,
|
|
0x1003, 0x2003, 0x4003, 0x8003, 0x10003 };
|
|
|
|
/* Hidden delcaration for fullbench */
|
|
size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr,
|
|
const void* src, size_t srcSize);
|
|
|
|
size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
const BYTE* const istart = (const BYTE* const)src;
|
|
const BYTE* const iend = istart + srcSize;
|
|
const BYTE* ip = istart;
|
|
int nbSeq;
|
|
DEBUGLOG(5, "ZSTD_decodeSeqHeaders");
|
|
|
|
/* check */
|
|
if (srcSize < MIN_SEQUENCES_SIZE) return ERROR(srcSize_wrong);
|
|
|
|
/* SeqHead */
|
|
nbSeq = *ip++;
|
|
if (!nbSeq) { *nbSeqPtr=0; return 1; }
|
|
if (nbSeq > 0x7F) {
|
|
if (nbSeq == 0xFF) {
|
|
if (ip+2 > iend) return ERROR(srcSize_wrong);
|
|
nbSeq = MEM_readLE16(ip) + LONGNBSEQ, ip+=2;
|
|
} else {
|
|
if (ip >= iend) return ERROR(srcSize_wrong);
|
|
nbSeq = ((nbSeq-0x80)<<8) + *ip++;
|
|
}
|
|
}
|
|
*nbSeqPtr = nbSeq;
|
|
|
|
/* FSE table descriptors */
|
|
if (ip+4 > iend) return ERROR(srcSize_wrong); /* minimum possible size */
|
|
{ symbolEncodingType_e const LLtype = (symbolEncodingType_e)(*ip >> 6);
|
|
symbolEncodingType_e const OFtype = (symbolEncodingType_e)((*ip >> 4) & 3);
|
|
symbolEncodingType_e const MLtype = (symbolEncodingType_e)((*ip >> 2) & 3);
|
|
ip++;
|
|
|
|
/* Build DTables */
|
|
{ size_t const llhSize = ZSTD_buildSeqTable(dctx->entropy.LLTable, &dctx->LLTptr,
|
|
LLtype, MaxLL, LLFSELog,
|
|
ip, iend-ip,
|
|
LL_base, LL_bits,
|
|
LL_defaultDTable, dctx->fseEntropy,
|
|
dctx->ddictIsCold, nbSeq);
|
|
if (ZSTD_isError(llhSize)) return ERROR(corruption_detected);
|
|
ip += llhSize;
|
|
}
|
|
|
|
{ size_t const ofhSize = ZSTD_buildSeqTable(dctx->entropy.OFTable, &dctx->OFTptr,
|
|
OFtype, MaxOff, OffFSELog,
|
|
ip, iend-ip,
|
|
OF_base, OF_bits,
|
|
OF_defaultDTable, dctx->fseEntropy,
|
|
dctx->ddictIsCold, nbSeq);
|
|
if (ZSTD_isError(ofhSize)) return ERROR(corruption_detected);
|
|
ip += ofhSize;
|
|
}
|
|
|
|
{ size_t const mlhSize = ZSTD_buildSeqTable(dctx->entropy.MLTable, &dctx->MLTptr,
|
|
MLtype, MaxML, MLFSELog,
|
|
ip, iend-ip,
|
|
ML_base, ML_bits,
|
|
ML_defaultDTable, dctx->fseEntropy,
|
|
dctx->ddictIsCold, nbSeq);
|
|
if (ZSTD_isError(mlhSize)) return ERROR(corruption_detected);
|
|
ip += mlhSize;
|
|
}
|
|
}
|
|
|
|
/* prefetch dictionary content */
|
|
if (dctx->ddictIsCold) {
|
|
size_t const dictSize = (const char*)dctx->prefixStart - (const char*)dctx->virtualStart;
|
|
size_t const psmin = MIN(dictSize, (size_t)(64*nbSeq) /* heuristic */ );
|
|
size_t const pSize = MIN(psmin, 128 KB /* protection */ );
|
|
const void* const pStart = (const char*)dctx->dictEnd - pSize;
|
|
PREFETCH_AREA(pStart, pSize);
|
|
dctx->ddictIsCold = 0;
|
|
}
|
|
|
|
return ip-istart;
|
|
}
|
|
|
|
|
|
typedef struct {
|
|
size_t litLength;
|
|
size_t matchLength;
|
|
size_t offset;
|
|
const BYTE* match;
|
|
} seq_t;
|
|
|
|
typedef struct {
|
|
size_t state;
|
|
const ZSTD_seqSymbol* table;
|
|
} ZSTD_fseState;
|
|
|
|
typedef struct {
|
|
BIT_DStream_t DStream;
|
|
ZSTD_fseState stateLL;
|
|
ZSTD_fseState stateOffb;
|
|
ZSTD_fseState stateML;
|
|
size_t prevOffset[ZSTD_REP_NUM];
|
|
const BYTE* prefixStart;
|
|
const BYTE* dictEnd;
|
|
size_t pos;
|
|
} seqState_t;
|
|
|
|
|
|
FORCE_NOINLINE
|
|
size_t ZSTD_execSequenceLast7(BYTE* op,
|
|
BYTE* const oend, seq_t sequence,
|
|
const BYTE** litPtr, const BYTE* const litLimit,
|
|
const BYTE* const base, const BYTE* const vBase, const BYTE* const dictEnd)
|
|
{
|
|
BYTE* const oLitEnd = op + sequence.litLength;
|
|
size_t const sequenceLength = sequence.litLength + sequence.matchLength;
|
|
BYTE* const oMatchEnd = op + sequenceLength; /* risk : address space overflow (32-bits) */
|
|
BYTE* const oend_w = oend - WILDCOPY_OVERLENGTH;
|
|
const BYTE* const iLitEnd = *litPtr + sequence.litLength;
|
|
const BYTE* match = oLitEnd - sequence.offset;
|
|
|
|
/* check */
|
|
if (oMatchEnd>oend) return ERROR(dstSize_tooSmall); /* last match must start at a minimum distance of WILDCOPY_OVERLENGTH from oend */
|
|
if (iLitEnd > litLimit) return ERROR(corruption_detected); /* over-read beyond lit buffer */
|
|
if (oLitEnd <= oend_w) return ERROR(GENERIC); /* Precondition */
|
|
|
|
/* copy literals */
|
|
if (op < oend_w) {
|
|
ZSTD_wildcopy(op, *litPtr, oend_w - op);
|
|
*litPtr += oend_w - op;
|
|
op = oend_w;
|
|
}
|
|
while (op < oLitEnd) *op++ = *(*litPtr)++;
|
|
|
|
/* copy Match */
|
|
if (sequence.offset > (size_t)(oLitEnd - base)) {
|
|
/* offset beyond prefix */
|
|
if (sequence.offset > (size_t)(oLitEnd - vBase)) return ERROR(corruption_detected);
|
|
match = dictEnd - (base-match);
|
|
if (match + sequence.matchLength <= dictEnd) {
|
|
memmove(oLitEnd, match, sequence.matchLength);
|
|
return sequenceLength;
|
|
}
|
|
/* span extDict & currentPrefixSegment */
|
|
{ size_t const length1 = dictEnd - match;
|
|
memmove(oLitEnd, match, length1);
|
|
op = oLitEnd + length1;
|
|
sequence.matchLength -= length1;
|
|
match = base;
|
|
} }
|
|
while (op < oMatchEnd) *op++ = *match++;
|
|
return sequenceLength;
|
|
}
|
|
|
|
|
|
HINT_INLINE
|
|
size_t ZSTD_execSequence(BYTE* op,
|
|
BYTE* const oend, seq_t sequence,
|
|
const BYTE** litPtr, const BYTE* const litLimit,
|
|
const BYTE* const prefixStart, const BYTE* const virtualStart, const BYTE* const dictEnd)
|
|
{
|
|
BYTE* const oLitEnd = op + sequence.litLength;
|
|
size_t const sequenceLength = sequence.litLength + sequence.matchLength;
|
|
BYTE* const oMatchEnd = op + sequenceLength; /* risk : address space overflow (32-bits) */
|
|
BYTE* const oend_w = oend - WILDCOPY_OVERLENGTH;
|
|
const BYTE* const iLitEnd = *litPtr + sequence.litLength;
|
|
const BYTE* match = oLitEnd - sequence.offset;
|
|
|
|
/* check */
|
|
if (oMatchEnd>oend) return ERROR(dstSize_tooSmall); /* last match must start at a minimum distance of WILDCOPY_OVERLENGTH from oend */
|
|
if (iLitEnd > litLimit) return ERROR(corruption_detected); /* over-read beyond lit buffer */
|
|
if (oLitEnd>oend_w) return ZSTD_execSequenceLast7(op, oend, sequence, litPtr, litLimit, prefixStart, virtualStart, dictEnd);
|
|
|
|
/* copy Literals */
|
|
ZSTD_copy8(op, *litPtr);
|
|
if (sequence.litLength > 8)
|
|
ZSTD_wildcopy(op+8, (*litPtr)+8, sequence.litLength - 8); /* note : since oLitEnd <= oend-WILDCOPY_OVERLENGTH, no risk of overwrite beyond oend */
|
|
op = oLitEnd;
|
|
*litPtr = iLitEnd; /* update for next sequence */
|
|
|
|
/* copy Match */
|
|
if (sequence.offset > (size_t)(oLitEnd - prefixStart)) {
|
|
/* offset beyond prefix -> go into extDict */
|
|
if (sequence.offset > (size_t)(oLitEnd - virtualStart))
|
|
return ERROR(corruption_detected);
|
|
match = dictEnd + (match - prefixStart);
|
|
if (match + sequence.matchLength <= dictEnd) {
|
|
memmove(oLitEnd, match, sequence.matchLength);
|
|
return sequenceLength;
|
|
}
|
|
/* span extDict & currentPrefixSegment */
|
|
{ size_t const length1 = dictEnd - match;
|
|
memmove(oLitEnd, match, length1);
|
|
op = oLitEnd + length1;
|
|
sequence.matchLength -= length1;
|
|
match = prefixStart;
|
|
if (op > oend_w || sequence.matchLength < MINMATCH) {
|
|
U32 i;
|
|
for (i = 0; i < sequence.matchLength; ++i) op[i] = match[i];
|
|
return sequenceLength;
|
|
}
|
|
} }
|
|
/* Requirement: op <= oend_w && sequence.matchLength >= MINMATCH */
|
|
|
|
/* match within prefix */
|
|
if (sequence.offset < 8) {
|
|
/* close range match, overlap */
|
|
static const U32 dec32table[] = { 0, 1, 2, 1, 4, 4, 4, 4 }; /* added */
|
|
static const int dec64table[] = { 8, 8, 8, 7, 8, 9,10,11 }; /* subtracted */
|
|
int const sub2 = dec64table[sequence.offset];
|
|
op[0] = match[0];
|
|
op[1] = match[1];
|
|
op[2] = match[2];
|
|
op[3] = match[3];
|
|
match += dec32table[sequence.offset];
|
|
ZSTD_copy4(op+4, match);
|
|
match -= sub2;
|
|
} else {
|
|
ZSTD_copy8(op, match);
|
|
}
|
|
op += 8; match += 8;
|
|
|
|
if (oMatchEnd > oend-(16-MINMATCH)) {
|
|
if (op < oend_w) {
|
|
ZSTD_wildcopy(op, match, oend_w - op);
|
|
match += oend_w - op;
|
|
op = oend_w;
|
|
}
|
|
while (op < oMatchEnd) *op++ = *match++;
|
|
} else {
|
|
ZSTD_wildcopy(op, match, (ptrdiff_t)sequence.matchLength-8); /* works even if matchLength < 8 */
|
|
}
|
|
return sequenceLength;
|
|
}
|
|
|
|
|
|
HINT_INLINE
|
|
size_t ZSTD_execSequenceLong(BYTE* op,
|
|
BYTE* const oend, seq_t sequence,
|
|
const BYTE** litPtr, const BYTE* const litLimit,
|
|
const BYTE* const prefixStart, const BYTE* const dictStart, const BYTE* const dictEnd)
|
|
{
|
|
BYTE* const oLitEnd = op + sequence.litLength;
|
|
size_t const sequenceLength = sequence.litLength + sequence.matchLength;
|
|
BYTE* const oMatchEnd = op + sequenceLength; /* risk : address space overflow (32-bits) */
|
|
BYTE* const oend_w = oend - WILDCOPY_OVERLENGTH;
|
|
const BYTE* const iLitEnd = *litPtr + sequence.litLength;
|
|
const BYTE* match = sequence.match;
|
|
|
|
/* check */
|
|
if (oMatchEnd > oend) return ERROR(dstSize_tooSmall); /* last match must start at a minimum distance of WILDCOPY_OVERLENGTH from oend */
|
|
if (iLitEnd > litLimit) return ERROR(corruption_detected); /* over-read beyond lit buffer */
|
|
if (oLitEnd > oend_w) return ZSTD_execSequenceLast7(op, oend, sequence, litPtr, litLimit, prefixStart, dictStart, dictEnd);
|
|
|
|
/* copy Literals */
|
|
ZSTD_copy8(op, *litPtr); /* note : op <= oLitEnd <= oend_w == oend - 8 */
|
|
if (sequence.litLength > 8)
|
|
ZSTD_wildcopy(op+8, (*litPtr)+8, sequence.litLength - 8); /* note : since oLitEnd <= oend-WILDCOPY_OVERLENGTH, no risk of overwrite beyond oend */
|
|
op = oLitEnd;
|
|
*litPtr = iLitEnd; /* update for next sequence */
|
|
|
|
/* copy Match */
|
|
if (sequence.offset > (size_t)(oLitEnd - prefixStart)) {
|
|
/* offset beyond prefix */
|
|
if (sequence.offset > (size_t)(oLitEnd - dictStart)) return ERROR(corruption_detected);
|
|
if (match + sequence.matchLength <= dictEnd) {
|
|
memmove(oLitEnd, match, sequence.matchLength);
|
|
return sequenceLength;
|
|
}
|
|
/* span extDict & currentPrefixSegment */
|
|
{ size_t const length1 = dictEnd - match;
|
|
memmove(oLitEnd, match, length1);
|
|
op = oLitEnd + length1;
|
|
sequence.matchLength -= length1;
|
|
match = prefixStart;
|
|
if (op > oend_w || sequence.matchLength < MINMATCH) {
|
|
U32 i;
|
|
for (i = 0; i < sequence.matchLength; ++i) op[i] = match[i];
|
|
return sequenceLength;
|
|
}
|
|
} }
|
|
assert(op <= oend_w);
|
|
assert(sequence.matchLength >= MINMATCH);
|
|
|
|
/* match within prefix */
|
|
if (sequence.offset < 8) {
|
|
/* close range match, overlap */
|
|
static const U32 dec32table[] = { 0, 1, 2, 1, 4, 4, 4, 4 }; /* added */
|
|
static const int dec64table[] = { 8, 8, 8, 7, 8, 9,10,11 }; /* subtracted */
|
|
int const sub2 = dec64table[sequence.offset];
|
|
op[0] = match[0];
|
|
op[1] = match[1];
|
|
op[2] = match[2];
|
|
op[3] = match[3];
|
|
match += dec32table[sequence.offset];
|
|
ZSTD_copy4(op+4, match);
|
|
match -= sub2;
|
|
} else {
|
|
ZSTD_copy8(op, match);
|
|
}
|
|
op += 8; match += 8;
|
|
|
|
if (oMatchEnd > oend-(16-MINMATCH)) {
|
|
if (op < oend_w) {
|
|
ZSTD_wildcopy(op, match, oend_w - op);
|
|
match += oend_w - op;
|
|
op = oend_w;
|
|
}
|
|
while (op < oMatchEnd) *op++ = *match++;
|
|
} else {
|
|
ZSTD_wildcopy(op, match, (ptrdiff_t)sequence.matchLength-8); /* works even if matchLength < 8 */
|
|
}
|
|
return sequenceLength;
|
|
}
|
|
|
|
static void
|
|
ZSTD_initFseState(ZSTD_fseState* DStatePtr, BIT_DStream_t* bitD, const ZSTD_seqSymbol* dt)
|
|
{
|
|
const void* ptr = dt;
|
|
const ZSTD_seqSymbol_header* const DTableH = (const ZSTD_seqSymbol_header*)ptr;
|
|
DStatePtr->state = BIT_readBits(bitD, DTableH->tableLog);
|
|
DEBUGLOG(6, "ZSTD_initFseState : val=%u using %u bits",
|
|
(U32)DStatePtr->state, DTableH->tableLog);
|
|
BIT_reloadDStream(bitD);
|
|
DStatePtr->table = dt + 1;
|
|
}
|
|
|
|
FORCE_INLINE_TEMPLATE void
|
|
ZSTD_updateFseState(ZSTD_fseState* DStatePtr, BIT_DStream_t* bitD)
|
|
{
|
|
ZSTD_seqSymbol const DInfo = DStatePtr->table[DStatePtr->state];
|
|
U32 const nbBits = DInfo.nbBits;
|
|
size_t const lowBits = BIT_readBits(bitD, nbBits);
|
|
DStatePtr->state = DInfo.nextState + lowBits;
|
|
}
|
|
|
|
/* We need to add at most (ZSTD_WINDOWLOG_MAX_32 - 1) bits to read the maximum
|
|
* offset bits. But we can only read at most (STREAM_ACCUMULATOR_MIN_32 - 1)
|
|
* bits before reloading. This value is the maximum number of bytes we read
|
|
* after reloading when we are decoding long offets.
|
|
*/
|
|
#define LONG_OFFSETS_MAX_EXTRA_BITS_32 \
|
|
(ZSTD_WINDOWLOG_MAX_32 > STREAM_ACCUMULATOR_MIN_32 \
|
|
? ZSTD_WINDOWLOG_MAX_32 - STREAM_ACCUMULATOR_MIN_32 \
|
|
: 0)
|
|
|
|
typedef enum { ZSTD_lo_isRegularOffset, ZSTD_lo_isLongOffset=1 } ZSTD_longOffset_e;
|
|
|
|
FORCE_INLINE_TEMPLATE seq_t
|
|
ZSTD_decodeSequence(seqState_t* seqState, const ZSTD_longOffset_e longOffsets)
|
|
{
|
|
seq_t seq;
|
|
U32 const llBits = seqState->stateLL.table[seqState->stateLL.state].nbAdditionalBits;
|
|
U32 const mlBits = seqState->stateML.table[seqState->stateML.state].nbAdditionalBits;
|
|
U32 const ofBits = seqState->stateOffb.table[seqState->stateOffb.state].nbAdditionalBits;
|
|
U32 const totalBits = llBits+mlBits+ofBits;
|
|
U32 const llBase = seqState->stateLL.table[seqState->stateLL.state].baseValue;
|
|
U32 const mlBase = seqState->stateML.table[seqState->stateML.state].baseValue;
|
|
U32 const ofBase = seqState->stateOffb.table[seqState->stateOffb.state].baseValue;
|
|
|
|
/* sequence */
|
|
{ size_t offset;
|
|
if (!ofBits)
|
|
offset = 0;
|
|
else {
|
|
ZSTD_STATIC_ASSERT(ZSTD_lo_isLongOffset == 1);
|
|
ZSTD_STATIC_ASSERT(LONG_OFFSETS_MAX_EXTRA_BITS_32 == 5);
|
|
assert(ofBits <= MaxOff);
|
|
if (MEM_32bits() && longOffsets && (ofBits >= STREAM_ACCUMULATOR_MIN_32)) {
|
|
U32 const extraBits = ofBits - MIN(ofBits, 32 - seqState->DStream.bitsConsumed);
|
|
offset = ofBase + (BIT_readBitsFast(&seqState->DStream, ofBits - extraBits) << extraBits);
|
|
BIT_reloadDStream(&seqState->DStream);
|
|
if (extraBits) offset += BIT_readBitsFast(&seqState->DStream, extraBits);
|
|
assert(extraBits <= LONG_OFFSETS_MAX_EXTRA_BITS_32); /* to avoid another reload */
|
|
} else {
|
|
offset = ofBase + BIT_readBitsFast(&seqState->DStream, ofBits/*>0*/); /* <= (ZSTD_WINDOWLOG_MAX-1) bits */
|
|
if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream);
|
|
}
|
|
}
|
|
|
|
if (ofBits <= 1) {
|
|
offset += (llBase==0);
|
|
if (offset) {
|
|
size_t temp = (offset==3) ? seqState->prevOffset[0] - 1 : seqState->prevOffset[offset];
|
|
temp += !temp; /* 0 is not valid; input is corrupted; force offset to 1 */
|
|
if (offset != 1) seqState->prevOffset[2] = seqState->prevOffset[1];
|
|
seqState->prevOffset[1] = seqState->prevOffset[0];
|
|
seqState->prevOffset[0] = offset = temp;
|
|
} else { /* offset == 0 */
|
|
offset = seqState->prevOffset[0];
|
|
}
|
|
} else {
|
|
seqState->prevOffset[2] = seqState->prevOffset[1];
|
|
seqState->prevOffset[1] = seqState->prevOffset[0];
|
|
seqState->prevOffset[0] = offset;
|
|
}
|
|
seq.offset = offset;
|
|
}
|
|
|
|
seq.matchLength = mlBase
|
|
+ ((mlBits>0) ? BIT_readBitsFast(&seqState->DStream, mlBits/*>0*/) : 0); /* <= 16 bits */
|
|
if (MEM_32bits() && (mlBits+llBits >= STREAM_ACCUMULATOR_MIN_32-LONG_OFFSETS_MAX_EXTRA_BITS_32))
|
|
BIT_reloadDStream(&seqState->DStream);
|
|
if (MEM_64bits() && (totalBits >= STREAM_ACCUMULATOR_MIN_64-(LLFSELog+MLFSELog+OffFSELog)))
|
|
BIT_reloadDStream(&seqState->DStream);
|
|
/* Ensure there are enough bits to read the rest of data in 64-bit mode. */
|
|
ZSTD_STATIC_ASSERT(16+LLFSELog+MLFSELog+OffFSELog < STREAM_ACCUMULATOR_MIN_64);
|
|
|
|
seq.litLength = llBase
|
|
+ ((llBits>0) ? BIT_readBitsFast(&seqState->DStream, llBits/*>0*/) : 0); /* <= 16 bits */
|
|
if (MEM_32bits())
|
|
BIT_reloadDStream(&seqState->DStream);
|
|
|
|
DEBUGLOG(6, "seq: litL=%u, matchL=%u, offset=%u",
|
|
(U32)seq.litLength, (U32)seq.matchLength, (U32)seq.offset);
|
|
|
|
/* ANS state update */
|
|
ZSTD_updateFseState(&seqState->stateLL, &seqState->DStream); /* <= 9 bits */
|
|
ZSTD_updateFseState(&seqState->stateML, &seqState->DStream); /* <= 9 bits */
|
|
if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream); /* <= 18 bits */
|
|
ZSTD_updateFseState(&seqState->stateOffb, &seqState->DStream); /* <= 8 bits */
|
|
|
|
return seq;
|
|
}
|
|
|
|
FORCE_INLINE_TEMPLATE size_t
|
|
ZSTD_decompressSequences_body( ZSTD_DCtx* dctx,
|
|
void* dst, size_t maxDstSize,
|
|
const void* seqStart, size_t seqSize, int nbSeq,
|
|
const ZSTD_longOffset_e isLongOffset)
|
|
{
|
|
const BYTE* ip = (const BYTE*)seqStart;
|
|
const BYTE* const iend = ip + seqSize;
|
|
BYTE* const ostart = (BYTE* const)dst;
|
|
BYTE* const oend = ostart + maxDstSize;
|
|
BYTE* op = ostart;
|
|
const BYTE* litPtr = dctx->litPtr;
|
|
const BYTE* const litEnd = litPtr + dctx->litSize;
|
|
const BYTE* const prefixStart = (const BYTE*) (dctx->prefixStart);
|
|
const BYTE* const vBase = (const BYTE*) (dctx->virtualStart);
|
|
const BYTE* const dictEnd = (const BYTE*) (dctx->dictEnd);
|
|
DEBUGLOG(5, "ZSTD_decompressSequences_body");
|
|
|
|
/* Regen sequences */
|
|
if (nbSeq) {
|
|
seqState_t seqState;
|
|
dctx->fseEntropy = 1;
|
|
{ U32 i; for (i=0; i<ZSTD_REP_NUM; i++) seqState.prevOffset[i] = dctx->entropy.rep[i]; }
|
|
CHECK_E(BIT_initDStream(&seqState.DStream, ip, iend-ip), corruption_detected);
|
|
ZSTD_initFseState(&seqState.stateLL, &seqState.DStream, dctx->LLTptr);
|
|
ZSTD_initFseState(&seqState.stateOffb, &seqState.DStream, dctx->OFTptr);
|
|
ZSTD_initFseState(&seqState.stateML, &seqState.DStream, dctx->MLTptr);
|
|
|
|
for ( ; (BIT_reloadDStream(&(seqState.DStream)) <= BIT_DStream_completed) && nbSeq ; ) {
|
|
nbSeq--;
|
|
{ seq_t const sequence = ZSTD_decodeSequence(&seqState, isLongOffset);
|
|
size_t const oneSeqSize = ZSTD_execSequence(op, oend, sequence, &litPtr, litEnd, prefixStart, vBase, dictEnd);
|
|
DEBUGLOG(6, "regenerated sequence size : %u", (U32)oneSeqSize);
|
|
if (ZSTD_isError(oneSeqSize)) return oneSeqSize;
|
|
op += oneSeqSize;
|
|
} }
|
|
|
|
/* check if reached exact end */
|
|
DEBUGLOG(5, "ZSTD_decompressSequences_body: after decode loop, remaining nbSeq : %i", nbSeq);
|
|
if (nbSeq) return ERROR(corruption_detected);
|
|
/* save reps for next block */
|
|
{ U32 i; for (i=0; i<ZSTD_REP_NUM; i++) dctx->entropy.rep[i] = (U32)(seqState.prevOffset[i]); }
|
|
}
|
|
|
|
/* last literal segment */
|
|
{ size_t const lastLLSize = litEnd - litPtr;
|
|
if (lastLLSize > (size_t)(oend-op)) return ERROR(dstSize_tooSmall);
|
|
memcpy(op, litPtr, lastLLSize);
|
|
op += lastLLSize;
|
|
}
|
|
|
|
return op-ostart;
|
|
}
|
|
|
|
static size_t
|
|
ZSTD_decompressSequences_default(ZSTD_DCtx* dctx,
|
|
void* dst, size_t maxDstSize,
|
|
const void* seqStart, size_t seqSize, int nbSeq,
|
|
const ZSTD_longOffset_e isLongOffset)
|
|
{
|
|
return ZSTD_decompressSequences_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
|
|
}
|
|
|
|
|
|
|
|
FORCE_INLINE_TEMPLATE seq_t
|
|
ZSTD_decodeSequenceLong(seqState_t* seqState, ZSTD_longOffset_e const longOffsets)
|
|
{
|
|
seq_t seq;
|
|
U32 const llBits = seqState->stateLL.table[seqState->stateLL.state].nbAdditionalBits;
|
|
U32 const mlBits = seqState->stateML.table[seqState->stateML.state].nbAdditionalBits;
|
|
U32 const ofBits = seqState->stateOffb.table[seqState->stateOffb.state].nbAdditionalBits;
|
|
U32 const totalBits = llBits+mlBits+ofBits;
|
|
U32 const llBase = seqState->stateLL.table[seqState->stateLL.state].baseValue;
|
|
U32 const mlBase = seqState->stateML.table[seqState->stateML.state].baseValue;
|
|
U32 const ofBase = seqState->stateOffb.table[seqState->stateOffb.state].baseValue;
|
|
|
|
/* sequence */
|
|
{ size_t offset;
|
|
if (!ofBits)
|
|
offset = 0;
|
|
else {
|
|
ZSTD_STATIC_ASSERT(ZSTD_lo_isLongOffset == 1);
|
|
ZSTD_STATIC_ASSERT(LONG_OFFSETS_MAX_EXTRA_BITS_32 == 5);
|
|
assert(ofBits <= MaxOff);
|
|
if (MEM_32bits() && longOffsets) {
|
|
U32 const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN_32-1);
|
|
offset = ofBase + (BIT_readBitsFast(&seqState->DStream, ofBits - extraBits) << extraBits);
|
|
if (MEM_32bits() || extraBits) BIT_reloadDStream(&seqState->DStream);
|
|
if (extraBits) offset += BIT_readBitsFast(&seqState->DStream, extraBits);
|
|
} else {
|
|
offset = ofBase + BIT_readBitsFast(&seqState->DStream, ofBits); /* <= (ZSTD_WINDOWLOG_MAX-1) bits */
|
|
if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream);
|
|
}
|
|
}
|
|
|
|
if (ofBits <= 1) {
|
|
offset += (llBase==0);
|
|
if (offset) {
|
|
size_t temp = (offset==3) ? seqState->prevOffset[0] - 1 : seqState->prevOffset[offset];
|
|
temp += !temp; /* 0 is not valid; input is corrupted; force offset to 1 */
|
|
if (offset != 1) seqState->prevOffset[2] = seqState->prevOffset[1];
|
|
seqState->prevOffset[1] = seqState->prevOffset[0];
|
|
seqState->prevOffset[0] = offset = temp;
|
|
} else {
|
|
offset = seqState->prevOffset[0];
|
|
}
|
|
} else {
|
|
seqState->prevOffset[2] = seqState->prevOffset[1];
|
|
seqState->prevOffset[1] = seqState->prevOffset[0];
|
|
seqState->prevOffset[0] = offset;
|
|
}
|
|
seq.offset = offset;
|
|
}
|
|
|
|
seq.matchLength = mlBase + ((mlBits>0) ? BIT_readBitsFast(&seqState->DStream, mlBits) : 0); /* <= 16 bits */
|
|
if (MEM_32bits() && (mlBits+llBits >= STREAM_ACCUMULATOR_MIN_32-LONG_OFFSETS_MAX_EXTRA_BITS_32))
|
|
BIT_reloadDStream(&seqState->DStream);
|
|
if (MEM_64bits() && (totalBits >= STREAM_ACCUMULATOR_MIN_64-(LLFSELog+MLFSELog+OffFSELog)))
|
|
BIT_reloadDStream(&seqState->DStream);
|
|
/* Verify that there is enough bits to read the rest of the data in 64-bit mode. */
|
|
ZSTD_STATIC_ASSERT(16+LLFSELog+MLFSELog+OffFSELog < STREAM_ACCUMULATOR_MIN_64);
|
|
|
|
seq.litLength = llBase + ((llBits>0) ? BIT_readBitsFast(&seqState->DStream, llBits) : 0); /* <= 16 bits */
|
|
if (MEM_32bits())
|
|
BIT_reloadDStream(&seqState->DStream);
|
|
|
|
{ size_t const pos = seqState->pos + seq.litLength;
|
|
const BYTE* const matchBase = (seq.offset > pos) ? seqState->dictEnd : seqState->prefixStart;
|
|
seq.match = matchBase + pos - seq.offset; /* note : this operation can overflow when seq.offset is really too large, which can only happen when input is corrupted.
|
|
* No consequence though : no memory access will occur, overly large offset will be detected in ZSTD_execSequenceLong() */
|
|
seqState->pos = pos + seq.matchLength;
|
|
}
|
|
|
|
/* ANS state update */
|
|
ZSTD_updateFseState(&seqState->stateLL, &seqState->DStream); /* <= 9 bits */
|
|
ZSTD_updateFseState(&seqState->stateML, &seqState->DStream); /* <= 9 bits */
|
|
if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream); /* <= 18 bits */
|
|
ZSTD_updateFseState(&seqState->stateOffb, &seqState->DStream); /* <= 8 bits */
|
|
|
|
return seq;
|
|
}
|
|
|
|
FORCE_INLINE_TEMPLATE size_t
|
|
ZSTD_decompressSequencesLong_body(
|
|
ZSTD_DCtx* dctx,
|
|
void* dst, size_t maxDstSize,
|
|
const void* seqStart, size_t seqSize, int nbSeq,
|
|
const ZSTD_longOffset_e isLongOffset)
|
|
{
|
|
const BYTE* ip = (const BYTE*)seqStart;
|
|
const BYTE* const iend = ip + seqSize;
|
|
BYTE* const ostart = (BYTE* const)dst;
|
|
BYTE* const oend = ostart + maxDstSize;
|
|
BYTE* op = ostart;
|
|
const BYTE* litPtr = dctx->litPtr;
|
|
const BYTE* const litEnd = litPtr + dctx->litSize;
|
|
const BYTE* const prefixStart = (const BYTE*) (dctx->prefixStart);
|
|
const BYTE* const dictStart = (const BYTE*) (dctx->virtualStart);
|
|
const BYTE* const dictEnd = (const BYTE*) (dctx->dictEnd);
|
|
|
|
/* Regen sequences */
|
|
if (nbSeq) {
|
|
#define STORED_SEQS 4
|
|
#define STOSEQ_MASK (STORED_SEQS-1)
|
|
#define ADVANCED_SEQS 4
|
|
seq_t sequences[STORED_SEQS];
|
|
int const seqAdvance = MIN(nbSeq, ADVANCED_SEQS);
|
|
seqState_t seqState;
|
|
int seqNb;
|
|
dctx->fseEntropy = 1;
|
|
{ U32 i; for (i=0; i<ZSTD_REP_NUM; i++) seqState.prevOffset[i] = dctx->entropy.rep[i]; }
|
|
seqState.prefixStart = prefixStart;
|
|
seqState.pos = (size_t)(op-prefixStart);
|
|
seqState.dictEnd = dictEnd;
|
|
CHECK_E(BIT_initDStream(&seqState.DStream, ip, iend-ip), corruption_detected);
|
|
ZSTD_initFseState(&seqState.stateLL, &seqState.DStream, dctx->LLTptr);
|
|
ZSTD_initFseState(&seqState.stateOffb, &seqState.DStream, dctx->OFTptr);
|
|
ZSTD_initFseState(&seqState.stateML, &seqState.DStream, dctx->MLTptr);
|
|
|
|
/* prepare in advance */
|
|
for (seqNb=0; (BIT_reloadDStream(&seqState.DStream) <= BIT_DStream_completed) && (seqNb<seqAdvance); seqNb++) {
|
|
sequences[seqNb] = ZSTD_decodeSequenceLong(&seqState, isLongOffset);
|
|
}
|
|
if (seqNb<seqAdvance) return ERROR(corruption_detected);
|
|
|
|
/* decode and decompress */
|
|
for ( ; (BIT_reloadDStream(&(seqState.DStream)) <= BIT_DStream_completed) && (seqNb<nbSeq) ; seqNb++) {
|
|
seq_t const sequence = ZSTD_decodeSequenceLong(&seqState, isLongOffset);
|
|
size_t const oneSeqSize = ZSTD_execSequenceLong(op, oend, sequences[(seqNb-ADVANCED_SEQS) & STOSEQ_MASK], &litPtr, litEnd, prefixStart, dictStart, dictEnd);
|
|
if (ZSTD_isError(oneSeqSize)) return oneSeqSize;
|
|
PREFETCH(sequence.match); /* note : it's safe to invoke PREFETCH() on any memory address, including invalid ones */
|
|
sequences[seqNb&STOSEQ_MASK] = sequence;
|
|
op += oneSeqSize;
|
|
}
|
|
if (seqNb<nbSeq) return ERROR(corruption_detected);
|
|
|
|
/* finish queue */
|
|
seqNb -= seqAdvance;
|
|
for ( ; seqNb<nbSeq ; seqNb++) {
|
|
size_t const oneSeqSize = ZSTD_execSequenceLong(op, oend, sequences[seqNb&STOSEQ_MASK], &litPtr, litEnd, prefixStart, dictStart, dictEnd);
|
|
if (ZSTD_isError(oneSeqSize)) return oneSeqSize;
|
|
op += oneSeqSize;
|
|
}
|
|
|
|
/* save reps for next block */
|
|
{ U32 i; for (i=0; i<ZSTD_REP_NUM; i++) dctx->entropy.rep[i] = (U32)(seqState.prevOffset[i]); }
|
|
#undef STORED_SEQS
|
|
#undef STOSEQ_MASK
|
|
#undef ADVANCED_SEQS
|
|
}
|
|
|
|
/* last literal segment */
|
|
{ size_t const lastLLSize = litEnd - litPtr;
|
|
if (lastLLSize > (size_t)(oend-op)) return ERROR(dstSize_tooSmall);
|
|
memcpy(op, litPtr, lastLLSize);
|
|
op += lastLLSize;
|
|
}
|
|
|
|
return op-ostart;
|
|
}
|
|
|
|
static size_t
|
|
ZSTD_decompressSequencesLong_default(ZSTD_DCtx* dctx,
|
|
void* dst, size_t maxDstSize,
|
|
const void* seqStart, size_t seqSize, int nbSeq,
|
|
const ZSTD_longOffset_e isLongOffset)
|
|
{
|
|
return ZSTD_decompressSequencesLong_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
|
|
}
|
|
|
|
|
|
|
|
#if DYNAMIC_BMI2
|
|
|
|
static TARGET_ATTRIBUTE("bmi2") size_t
|
|
ZSTD_decompressSequences_bmi2(ZSTD_DCtx* dctx,
|
|
void* dst, size_t maxDstSize,
|
|
const void* seqStart, size_t seqSize, int nbSeq,
|
|
const ZSTD_longOffset_e isLongOffset)
|
|
{
|
|
return ZSTD_decompressSequences_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
|
|
}
|
|
|
|
static TARGET_ATTRIBUTE("bmi2") size_t
|
|
ZSTD_decompressSequencesLong_bmi2(ZSTD_DCtx* dctx,
|
|
void* dst, size_t maxDstSize,
|
|
const void* seqStart, size_t seqSize, int nbSeq,
|
|
const ZSTD_longOffset_e isLongOffset)
|
|
{
|
|
return ZSTD_decompressSequencesLong_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
|
|
}
|
|
|
|
#endif
|
|
|
|
typedef size_t (*ZSTD_decompressSequences_t)(
|
|
ZSTD_DCtx *dctx, void *dst, size_t maxDstSize,
|
|
const void *seqStart, size_t seqSize, int nbSeq,
|
|
const ZSTD_longOffset_e isLongOffset);
|
|
|
|
static size_t ZSTD_decompressSequences(ZSTD_DCtx* dctx, void* dst, size_t maxDstSize,
|
|
const void* seqStart, size_t seqSize, int nbSeq,
|
|
const ZSTD_longOffset_e isLongOffset)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_decompressSequences");
|
|
#if DYNAMIC_BMI2
|
|
if (dctx->bmi2) {
|
|
return ZSTD_decompressSequences_bmi2(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
|
|
}
|
|
#endif
|
|
return ZSTD_decompressSequences_default(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
|
|
}
|
|
|
|
static size_t ZSTD_decompressSequencesLong(ZSTD_DCtx* dctx,
|
|
void* dst, size_t maxDstSize,
|
|
const void* seqStart, size_t seqSize, int nbSeq,
|
|
const ZSTD_longOffset_e isLongOffset)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_decompressSequencesLong");
|
|
#if DYNAMIC_BMI2
|
|
if (dctx->bmi2) {
|
|
return ZSTD_decompressSequencesLong_bmi2(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
|
|
}
|
|
#endif
|
|
return ZSTD_decompressSequencesLong_default(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
|
|
}
|
|
|
|
/* ZSTD_getLongOffsetsShare() :
|
|
* condition : offTable must be valid
|
|
* @return : "share" of long offsets (arbitrarily defined as > (1<<23))
|
|
* compared to maximum possible of (1<<OffFSELog) */
|
|
static unsigned
|
|
ZSTD_getLongOffsetsShare(const ZSTD_seqSymbol* offTable)
|
|
{
|
|
const void* ptr = offTable;
|
|
U32 const tableLog = ((const ZSTD_seqSymbol_header*)ptr)[0].tableLog;
|
|
const ZSTD_seqSymbol* table = offTable + 1;
|
|
U32 const max = 1 << tableLog;
|
|
U32 u, total = 0;
|
|
DEBUGLOG(5, "ZSTD_getLongOffsetsShare: (tableLog=%u)", tableLog);
|
|
|
|
assert(max <= (1 << OffFSELog)); /* max not too large */
|
|
for (u=0; u<max; u++) {
|
|
if (table[u].nbAdditionalBits > 22) total += 1;
|
|
}
|
|
|
|
assert(tableLog <= OffFSELog);
|
|
total <<= (OffFSELog - tableLog); /* scale to OffFSELog */
|
|
|
|
return total;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize, const int frame)
|
|
{ /* blockType == blockCompressed */
|
|
const BYTE* ip = (const BYTE*)src;
|
|
/* isLongOffset must be true if there are long offsets.
|
|
* Offsets are long if they are larger than 2^STREAM_ACCUMULATOR_MIN.
|
|
* We don't expect that to be the case in 64-bit mode.
|
|
* In block mode, window size is not known, so we have to be conservative.
|
|
* (note: but it could be evaluated from current-lowLimit)
|
|
*/
|
|
ZSTD_longOffset_e const isLongOffset = (ZSTD_longOffset_e)(MEM_32bits() && (!frame || dctx->fParams.windowSize > (1ULL << STREAM_ACCUMULATOR_MIN)));
|
|
DEBUGLOG(5, "ZSTD_decompressBlock_internal (size : %u)", (U32)srcSize);
|
|
|
|
if (srcSize >= ZSTD_BLOCKSIZE_MAX) return ERROR(srcSize_wrong);
|
|
|
|
/* Decode literals section */
|
|
{ size_t const litCSize = ZSTD_decodeLiteralsBlock(dctx, src, srcSize);
|
|
DEBUGLOG(5, "ZSTD_decodeLiteralsBlock : %u", (U32)litCSize);
|
|
if (ZSTD_isError(litCSize)) return litCSize;
|
|
ip += litCSize;
|
|
srcSize -= litCSize;
|
|
}
|
|
|
|
/* Build Decoding Tables */
|
|
{ int nbSeq;
|
|
size_t const seqHSize = ZSTD_decodeSeqHeaders(dctx, &nbSeq, ip, srcSize);
|
|
if (ZSTD_isError(seqHSize)) return seqHSize;
|
|
ip += seqHSize;
|
|
srcSize -= seqHSize;
|
|
|
|
if ( (!frame || dctx->fParams.windowSize > (1<<24))
|
|
&& (nbSeq>0) ) { /* could probably use a larger nbSeq limit */
|
|
U32 const shareLongOffsets = ZSTD_getLongOffsetsShare(dctx->OFTptr);
|
|
U32 const minShare = MEM_64bits() ? 7 : 20; /* heuristic values, correspond to 2.73% and 7.81% */
|
|
if (shareLongOffsets >= minShare)
|
|
return ZSTD_decompressSequencesLong(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset);
|
|
}
|
|
|
|
return ZSTD_decompressSequences(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset);
|
|
}
|
|
}
|
|
|
|
|
|
static 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;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_decompressBlock(ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
size_t dSize;
|
|
ZSTD_checkContinuity(dctx, dst);
|
|
dSize = ZSTD_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize, /* frame */ 0);
|
|
dctx->previousDstEnd = (char*)dst + dSize;
|
|
return dSize;
|
|
}
|
|
|
|
|
|
/** ZSTD_insertBlock() :
|
|
insert `src` block into `dctx` history. Useful to track uncompressed blocks. */
|
|
ZSTDLIB_API 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_generateNxBytes(void* dst, size_t dstCapacity, BYTE value, size_t length)
|
|
{
|
|
if (length > dstCapacity) return ERROR(dstSize_tooSmall);
|
|
memset(dst, value, length);
|
|
return length;
|
|
}
|
|
|
|
/** 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)
|
|
{
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
|
|
if (ZSTD_isLegacy(src, srcSize))
|
|
return ZSTD_findFrameCompressedSizeLegacy(src, srcSize);
|
|
#endif
|
|
if ( (srcSize >= ZSTD_skippableHeaderSize)
|
|
&& (MEM_readLE32(src) & 0xFFFFFFF0U) == ZSTD_MAGIC_SKIPPABLE_START ) {
|
|
return ZSTD_skippableHeaderSize + MEM_readLE32((const BYTE*)src + ZSTD_FRAMEIDSIZE);
|
|
} else {
|
|
const BYTE* ip = (const BYTE*)src;
|
|
const BYTE* const ipstart = ip;
|
|
size_t remainingSize = srcSize;
|
|
ZSTD_frameHeader zfh;
|
|
|
|
/* Extract Frame Header */
|
|
{ size_t const ret = ZSTD_getFrameHeader(&zfh, src, srcSize);
|
|
if (ZSTD_isError(ret)) return ret;
|
|
if (ret > 0) return ERROR(srcSize_wrong);
|
|
}
|
|
|
|
ip += zfh.headerSize;
|
|
remainingSize -= zfh.headerSize;
|
|
|
|
/* Loop on each block */
|
|
while (1) {
|
|
blockProperties_t blockProperties;
|
|
size_t const cBlockSize = ZSTD_getcBlockSize(ip, remainingSize, &blockProperties);
|
|
if (ZSTD_isError(cBlockSize)) return cBlockSize;
|
|
|
|
if (ZSTD_blockHeaderSize + cBlockSize > remainingSize)
|
|
return ERROR(srcSize_wrong);
|
|
|
|
ip += ZSTD_blockHeaderSize + cBlockSize;
|
|
remainingSize -= ZSTD_blockHeaderSize + cBlockSize;
|
|
|
|
if (blockProperties.lastBlock) break;
|
|
}
|
|
|
|
if (zfh.checksumFlag) { /* Final frame content checksum */
|
|
if (remainingSize < 4) return ERROR(srcSize_wrong);
|
|
ip += 4;
|
|
}
|
|
|
|
return ip - ipstart;
|
|
}
|
|
}
|
|
|
|
/*! ZSTD_decompressFrame() :
|
|
* @dctx must be properly initialized */
|
|
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 remainingSize = *srcSizePtr;
|
|
|
|
/* check */
|
|
if (remainingSize < ZSTD_frameHeaderSize_min+ZSTD_blockHeaderSize)
|
|
return ERROR(srcSize_wrong);
|
|
|
|
/* Frame Header */
|
|
{ size_t const frameHeaderSize = ZSTD_frameHeaderSize(ip, ZSTD_frameHeaderSize_prefix);
|
|
if (ZSTD_isError(frameHeaderSize)) return frameHeaderSize;
|
|
if (remainingSize < frameHeaderSize+ZSTD_blockHeaderSize)
|
|
return ERROR(srcSize_wrong);
|
|
CHECK_F( ZSTD_decodeFrameHeader(dctx, ip, frameHeaderSize) );
|
|
ip += frameHeaderSize; remainingSize -= frameHeaderSize;
|
|
}
|
|
|
|
/* Loop on each block */
|
|
while (1) {
|
|
size_t decodedSize;
|
|
blockProperties_t blockProperties;
|
|
size_t const cBlockSize = ZSTD_getcBlockSize(ip, remainingSize, &blockProperties);
|
|
if (ZSTD_isError(cBlockSize)) return cBlockSize;
|
|
|
|
ip += ZSTD_blockHeaderSize;
|
|
remainingSize -= ZSTD_blockHeaderSize;
|
|
if (cBlockSize > remainingSize) return ERROR(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_generateNxBytes(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;
|
|
remainingSize -= cBlockSize;
|
|
if (blockProperties.lastBlock) break;
|
|
}
|
|
|
|
if (dctx->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN) {
|
|
if ((U64)(op-ostart) != dctx->fParams.frameContentSize) {
|
|
return ERROR(corruption_detected);
|
|
} }
|
|
if (dctx->fParams.checksumFlag) { /* Frame content checksum verification */
|
|
U32 const checkCalc = (U32)XXH64_digest(&dctx->xxhState);
|
|
U32 checkRead;
|
|
if (remainingSize<4) return ERROR(checksum_wrong);
|
|
checkRead = MEM_readLE32(ip);
|
|
if (checkRead != checkCalc) return ERROR(checksum_wrong);
|
|
ip += 4;
|
|
remainingSize -= 4;
|
|
}
|
|
|
|
/* Allow caller to get size read */
|
|
*srcPtr = ip;
|
|
*srcSizePtr = remainingSize;
|
|
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_DDictDictContent(ddict);
|
|
dictSize = ZSTD_DDictDictSize(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;
|
|
/* legacy support is not compatible with static dctx */
|
|
if (dctx->staticSize) return ERROR(memory_allocation);
|
|
|
|
decodedSize = ZSTD_decompressLegacy(dst, dstCapacity, src, frameSize, dict, dictSize);
|
|
|
|
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)",
|
|
(U32)magicNumber, (U32)ZSTD_MAGICNUMBER);
|
|
if ((magicNumber & 0xFFFFFFF0U) == ZSTD_MAGIC_SKIPPABLE_START) {
|
|
size_t skippableSize;
|
|
if (srcSize < ZSTD_skippableHeaderSize)
|
|
return ERROR(srcSize_wrong);
|
|
skippableSize = MEM_readLE32((const BYTE*)src + ZSTD_FRAMEIDSIZE)
|
|
+ ZSTD_skippableHeaderSize;
|
|
if (srcSize < skippableSize) return ERROR(srcSize_wrong);
|
|
|
|
src = (const BYTE *)src + skippableSize;
|
|
srcSize -= skippableSize;
|
|
continue;
|
|
} }
|
|
|
|
if (ddict) {
|
|
/* we were called from ZSTD_decompress_usingDDict */
|
|
CHECK_F(ZSTD_decompressBegin_usingDDict(dctx, ddict));
|
|
} else {
|
|
/* this will initialize correctly with no dict if dict == NULL, so
|
|
* use this in all cases but ddict */
|
|
CHECK_F(ZSTD_decompressBegin_usingDict(dctx, dict, dictSize));
|
|
}
|
|
ZSTD_checkContinuity(dctx, dst);
|
|
|
|
{ const size_t res = ZSTD_decompressFrame(dctx, dst, dstCapacity,
|
|
&src, &srcSize);
|
|
if ( (ZSTD_getErrorCode(res) == ZSTD_error_prefix_unknown)
|
|
&& (moreThan1Frame==1) ) {
|
|
/* 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. */
|
|
return ERROR(srcSize_wrong);
|
|
}
|
|
if (ZSTD_isError(res)) return res;
|
|
/* no need to bound check, ZSTD_decompressFrame already has */
|
|
dst = (BYTE*)dst + res;
|
|
dstCapacity -= res;
|
|
}
|
|
moreThan1Frame = 1;
|
|
} /* while (srcSize >= ZSTD_frameHeaderSize_prefix) */
|
|
|
|
if (srcSize) return ERROR(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);
|
|
}
|
|
|
|
|
|
size_t ZSTD_decompressDCtx(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_decompress_usingDict(dctx, dst, dstCapacity, src, srcSize, NULL, 0);
|
|
}
|
|
|
|
|
|
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();
|
|
if (dctx==NULL) return ERROR(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)", (U32)srcSize);
|
|
/* Sanity check */
|
|
if (srcSize != dctx->expected) return ERROR(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) & 0xFFFFFFF0U) == 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);
|
|
CHECK_F(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, src, srcSize, 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", (U32)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", (U32)dctx->decodedSize);
|
|
if (dctx->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN) {
|
|
if (dctx->decodedSize != dctx->fParams.frameContentSize) {
|
|
return ERROR(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", h32, check32);
|
|
if (check32 != h32) return ERROR(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:
|
|
return ERROR(GENERIC); /* impossible */
|
|
}
|
|
}
|
|
|
|
|
|
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_loadEntropy() :
|
|
* dict : must point at beginning of a valid zstd dictionary.
|
|
* @return : size of entropy tables read */
|
|
static size_t ZSTD_loadEntropy(ZSTD_entropyDTables_t* entropy,
|
|
const void* const dict, size_t const dictSize)
|
|
{
|
|
const BYTE* dictPtr = (const BYTE*)dict;
|
|
const BYTE* const dictEnd = dictPtr + dictSize;
|
|
|
|
if (dictSize <= 8) return ERROR(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);
|
|
size_t const hSize = HUF_readDTableX2_wksp(entropy->hufTable,
|
|
dictPtr, dictEnd - dictPtr,
|
|
workspace, workspaceSize);
|
|
if (HUF_isError(hSize)) return ERROR(dictionary_corrupted);
|
|
dictPtr += hSize;
|
|
}
|
|
|
|
{ short offcodeNCount[MaxOff+1];
|
|
U32 offcodeMaxValue = MaxOff, offcodeLog;
|
|
size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, dictEnd-dictPtr);
|
|
if (FSE_isError(offcodeHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (offcodeMaxValue > MaxOff) return ERROR(dictionary_corrupted);
|
|
if (offcodeLog > OffFSELog) return ERROR(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);
|
|
if (FSE_isError(matchlengthHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (matchlengthMaxValue > MaxML) return ERROR(dictionary_corrupted);
|
|
if (matchlengthLog > MLFSELog) return ERROR(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);
|
|
if (FSE_isError(litlengthHeaderSize)) return ERROR(dictionary_corrupted);
|
|
if (litlengthMaxValue > MaxLL) return ERROR(dictionary_corrupted);
|
|
if (litlengthLog > LLFSELog) return ERROR(dictionary_corrupted);
|
|
ZSTD_buildFSETable( entropy->LLTable,
|
|
litlengthNCount, litlengthMaxValue,
|
|
LL_base, LL_bits,
|
|
litlengthLog);
|
|
dictPtr += litlengthHeaderSize;
|
|
}
|
|
|
|
if (dictPtr+12 > dictEnd) return ERROR(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;
|
|
if (rep==0 || rep >= dictContentSize) return ERROR(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_loadEntropy(&dctx->entropy, dict, dictSize);
|
|
if (ZSTD_isError(eSize)) return ERROR(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)
|
|
{
|
|
CHECK_F( ZSTD_decompressBegin(dctx) );
|
|
if (dict && dictSize)
|
|
CHECK_E(ZSTD_decompress_insertDictionary(dctx, dict, dictSize), dictionary_corrupted);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* ====== ZSTD_DDict ====== */
|
|
|
|
struct ZSTD_DDict_s {
|
|
void* dictBuffer;
|
|
const void* dictContent;
|
|
size_t dictSize;
|
|
ZSTD_entropyDTables_t entropy;
|
|
U32 dictID;
|
|
U32 entropyPresent;
|
|
ZSTD_customMem cMem;
|
|
}; /* typedef'd to ZSTD_DDict within "zstd.h" */
|
|
|
|
static const void* ZSTD_DDictDictContent(const ZSTD_DDict* ddict)
|
|
{
|
|
assert(ddict != NULL);
|
|
return ddict->dictContent;
|
|
}
|
|
|
|
static size_t ZSTD_DDictDictSize(const ZSTD_DDict* ddict)
|
|
{
|
|
assert(ddict != NULL);
|
|
return ddict->dictSize;
|
|
}
|
|
|
|
size_t ZSTD_decompressBegin_usingDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_decompressBegin_usingDDict");
|
|
assert(dctx != NULL);
|
|
if (ddict) {
|
|
dctx->ddictIsCold = (dctx->dictEnd != (const char*)ddict->dictContent + ddict->dictSize);
|
|
DEBUGLOG(4, "DDict is %s",
|
|
dctx->ddictIsCold ? "~cold~" : "hot!");
|
|
}
|
|
CHECK_F( ZSTD_decompressBegin(dctx) );
|
|
if (ddict) { /* NULL ddict is equivalent to no dictionary */
|
|
dctx->dictID = ddict->dictID;
|
|
dctx->prefixStart = ddict->dictContent;
|
|
dctx->virtualStart = ddict->dictContent;
|
|
dctx->dictEnd = (const BYTE*)ddict->dictContent + ddict->dictSize;
|
|
dctx->previousDstEnd = dctx->dictEnd;
|
|
if (ddict->entropyPresent) {
|
|
dctx->litEntropy = 1;
|
|
dctx->fseEntropy = 1;
|
|
dctx->LLTptr = ddict->entropy.LLTable;
|
|
dctx->MLTptr = ddict->entropy.MLTable;
|
|
dctx->OFTptr = ddict->entropy.OFTable;
|
|
dctx->HUFptr = ddict->entropy.hufTable;
|
|
dctx->entropy.rep[0] = ddict->entropy.rep[0];
|
|
dctx->entropy.rep[1] = ddict->entropy.rep[1];
|
|
dctx->entropy.rep[2] = ddict->entropy.rep[2];
|
|
} else {
|
|
dctx->litEntropy = 0;
|
|
dctx->fseEntropy = 0;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static size_t
|
|
ZSTD_loadEntropy_inDDict(ZSTD_DDict* ddict,
|
|
ZSTD_dictContentType_e dictContentType)
|
|
{
|
|
ddict->dictID = 0;
|
|
ddict->entropyPresent = 0;
|
|
if (dictContentType == ZSTD_dct_rawContent) return 0;
|
|
|
|
if (ddict->dictSize < 8) {
|
|
if (dictContentType == ZSTD_dct_fullDict)
|
|
return ERROR(dictionary_corrupted); /* only accept specified dictionaries */
|
|
return 0; /* pure content mode */
|
|
}
|
|
{ U32 const magic = MEM_readLE32(ddict->dictContent);
|
|
if (magic != ZSTD_MAGIC_DICTIONARY) {
|
|
if (dictContentType == ZSTD_dct_fullDict)
|
|
return ERROR(dictionary_corrupted); /* only accept specified dictionaries */
|
|
return 0; /* pure content mode */
|
|
}
|
|
}
|
|
ddict->dictID = MEM_readLE32((const char*)ddict->dictContent + ZSTD_FRAMEIDSIZE);
|
|
|
|
/* load entropy tables */
|
|
CHECK_E( ZSTD_loadEntropy(&ddict->entropy,
|
|
ddict->dictContent, ddict->dictSize),
|
|
dictionary_corrupted );
|
|
ddict->entropyPresent = 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_initDDict_internal(ZSTD_DDict* ddict,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictContentType_e dictContentType)
|
|
{
|
|
if ((dictLoadMethod == ZSTD_dlm_byRef) || (!dict) || (!dictSize)) {
|
|
ddict->dictBuffer = NULL;
|
|
ddict->dictContent = dict;
|
|
if (!dict) dictSize = 0;
|
|
} else {
|
|
void* const internalBuffer = ZSTD_malloc(dictSize, ddict->cMem);
|
|
ddict->dictBuffer = internalBuffer;
|
|
ddict->dictContent = internalBuffer;
|
|
if (!internalBuffer) return ERROR(memory_allocation);
|
|
memcpy(internalBuffer, dict, dictSize);
|
|
}
|
|
ddict->dictSize = dictSize;
|
|
ddict->entropy.hufTable[0] = (HUF_DTable)((HufLog)*0x1000001); /* cover both little and big endian */
|
|
|
|
/* parse dictionary content */
|
|
CHECK_F( ZSTD_loadEntropy_inDDict(ddict, dictContentType) );
|
|
|
|
return 0;
|
|
}
|
|
|
|
ZSTD_DDict* ZSTD_createDDict_advanced(const void* dict, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictContentType_e dictContentType,
|
|
ZSTD_customMem customMem)
|
|
{
|
|
if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
|
|
|
|
{ ZSTD_DDict* const ddict = (ZSTD_DDict*) ZSTD_malloc(sizeof(ZSTD_DDict), customMem);
|
|
if (ddict == NULL) return NULL;
|
|
ddict->cMem = customMem;
|
|
{ size_t const initResult = ZSTD_initDDict_internal(ddict,
|
|
dict, dictSize,
|
|
dictLoadMethod, dictContentType);
|
|
if (ZSTD_isError(initResult)) {
|
|
ZSTD_freeDDict(ddict);
|
|
return NULL;
|
|
} }
|
|
return ddict;
|
|
}
|
|
}
|
|
|
|
/*! ZSTD_createDDict() :
|
|
* Create a digested dictionary, to start decompression without startup delay.
|
|
* `dict` content is copied inside DDict.
|
|
* Consequently, `dict` can be released after `ZSTD_DDict` creation */
|
|
ZSTD_DDict* ZSTD_createDDict(const void* dict, size_t dictSize)
|
|
{
|
|
ZSTD_customMem const allocator = { NULL, NULL, NULL };
|
|
return ZSTD_createDDict_advanced(dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto, allocator);
|
|
}
|
|
|
|
/*! ZSTD_createDDict_byReference() :
|
|
* Create a digested dictionary, to start decompression without startup delay.
|
|
* Dictionary content is simply referenced, it will be accessed during decompression.
|
|
* Warning : dictBuffer must outlive DDict (DDict must be freed before dictBuffer) */
|
|
ZSTD_DDict* ZSTD_createDDict_byReference(const void* dictBuffer, size_t dictSize)
|
|
{
|
|
ZSTD_customMem const allocator = { NULL, NULL, NULL };
|
|
return ZSTD_createDDict_advanced(dictBuffer, dictSize, ZSTD_dlm_byRef, ZSTD_dct_auto, allocator);
|
|
}
|
|
|
|
|
|
const ZSTD_DDict* ZSTD_initStaticDDict(
|
|
void* sBuffer, size_t sBufferSize,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictContentType_e dictContentType)
|
|
{
|
|
size_t const neededSpace = sizeof(ZSTD_DDict)
|
|
+ (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize);
|
|
ZSTD_DDict* const ddict = (ZSTD_DDict*)sBuffer;
|
|
assert(sBuffer != NULL);
|
|
assert(dict != NULL);
|
|
if ((size_t)sBuffer & 7) return NULL; /* 8-aligned */
|
|
if (sBufferSize < neededSpace) return NULL;
|
|
if (dictLoadMethod == ZSTD_dlm_byCopy) {
|
|
memcpy(ddict+1, dict, dictSize); /* local copy */
|
|
dict = ddict+1;
|
|
}
|
|
if (ZSTD_isError( ZSTD_initDDict_internal(ddict,
|
|
dict, dictSize,
|
|
ZSTD_dlm_byRef, dictContentType) ))
|
|
return NULL;
|
|
return ddict;
|
|
}
|
|
|
|
|
|
size_t ZSTD_freeDDict(ZSTD_DDict* ddict)
|
|
{
|
|
if (ddict==NULL) return 0; /* support free on NULL */
|
|
{ ZSTD_customMem const cMem = ddict->cMem;
|
|
ZSTD_free(ddict->dictBuffer, cMem);
|
|
ZSTD_free(ddict, cMem);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*! ZSTD_estimateDDictSize() :
|
|
* Estimate amount of memory that will be needed to create a dictionary for decompression.
|
|
* Note : dictionary created by reference using ZSTD_dlm_byRef are smaller */
|
|
size_t ZSTD_estimateDDictSize(size_t dictSize, ZSTD_dictLoadMethod_e dictLoadMethod)
|
|
{
|
|
return sizeof(ZSTD_DDict) + (dictLoadMethod == ZSTD_dlm_byRef ? 0 : dictSize);
|
|
}
|
|
|
|
size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict)
|
|
{
|
|
if (ddict==NULL) return 0; /* support sizeof on NULL */
|
|
return sizeof(*ddict) + (ddict->dictBuffer ? ddict->dictSize : 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_fromDDict() :
|
|
* Provides the dictID of the dictionary loaded into `ddict`.
|
|
* If @return == 0, the dictionary is not conformant to Zstandard specification, or empty.
|
|
* Non-conformant dictionaries can still be loaded, but as content-only dictionaries. */
|
|
unsigned ZSTD_getDictID_fromDDict(const ZSTD_DDict* ddict)
|
|
{
|
|
if (ddict==NULL) return 0;
|
|
return ZSTD_getDictID_fromDict(ddict->dictContent, ddict->dictSize);
|
|
}
|
|
|
|
/*! ZSTD_getDictID_fromFrame() :
|
|
* Provides the dictID required to decompresse 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)
|
|
{
|
|
if (dctx->streamStage != zdss_init) return ERROR(stage_wrong);
|
|
ZSTD_freeDDict(dctx->ddictLocal);
|
|
if (dict && dictSize >= 8) {
|
|
dctx->ddictLocal = ZSTD_createDDict_advanced(dict, dictSize, dictLoadMethod, dictContentType, dctx->customMem);
|
|
if (dctx->ddictLocal == NULL) return ERROR(memory_allocation);
|
|
} else {
|
|
dctx->ddictLocal = NULL;
|
|
}
|
|
dctx->ddict = dctx->ddictLocal;
|
|
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)
|
|
{
|
|
return ZSTD_DCtx_loadDictionary_advanced(dctx, prefix, prefixSize, ZSTD_dlm_byRef, dictContentType);
|
|
}
|
|
|
|
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");
|
|
zds->streamStage = zdss_init;
|
|
zds->noForwardProgress = 0;
|
|
CHECK_F( 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_usingDict(zds, NULL, 0);
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
size_t const initResult = ZSTD_initDStream(dctx);
|
|
dctx->ddict = ddict;
|
|
return initResult;
|
|
}
|
|
|
|
/* ZSTD_resetDStream() :
|
|
* return : expected size, aka ZSTD_frameHeaderSize_prefix.
|
|
* this function cannot fail */
|
|
size_t ZSTD_resetDStream(ZSTD_DStream* dctx)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_resetDStream");
|
|
dctx->streamStage = zdss_loadHeader;
|
|
dctx->lhSize = dctx->inPos = dctx->outStart = dctx->outEnd = 0;
|
|
dctx->legacyVersion = 0;
|
|
dctx->hostageByte = 0;
|
|
return ZSTD_frameHeaderSize_prefix;
|
|
}
|
|
|
|
size_t ZSTD_setDStreamParameter(ZSTD_DStream* dctx,
|
|
ZSTD_DStreamParameter_e paramType, unsigned paramValue)
|
|
{
|
|
if (dctx->streamStage != zdss_init) return ERROR(stage_wrong);
|
|
switch(paramType)
|
|
{
|
|
default : return ERROR(parameter_unsupported);
|
|
case DStream_p_maxWindowSize :
|
|
DEBUGLOG(4, "setting maxWindowSize = %u KB", paramValue >> 10);
|
|
dctx->maxWindowSize = paramValue ? paramValue : (U32)(-1);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_DCtx_refDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict)
|
|
{
|
|
if (dctx->streamStage != zdss_init) return ERROR(stage_wrong);
|
|
dctx->ddict = ddict;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_DCtx_setMaxWindowSize(ZSTD_DCtx* dctx, size_t maxWindowSize)
|
|
{
|
|
if (dctx->streamStage != zdss_init) return ERROR(stage_wrong);
|
|
dctx->maxWindowSize = maxWindowSize;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_DCtx_setFormat(ZSTD_DCtx* dctx, ZSTD_format_e format)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_DCtx_setFormat : %u", (unsigned)format);
|
|
if (dctx->streamStage != zdss_init) return ERROR(stage_wrong);
|
|
dctx->format = format;
|
|
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;
|
|
if ((unsigned long long)minRBSize != neededSize) return ERROR(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 */
|
|
ZSTD_frameHeader zfh;
|
|
size_t const err = ZSTD_getFrameHeader(&zfh, src, srcSize);
|
|
if (ZSTD_isError(err)) return err;
|
|
if (err>0) return ERROR(srcSize_wrong);
|
|
if (zfh.windowSize > windowSizeMax)
|
|
return ERROR(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");
|
|
if (input->pos > input->size) { /* forbidden */
|
|
DEBUGLOG(5, "in: pos: %u vs size: %u",
|
|
(U32)input->pos, (U32)input->size);
|
|
return ERROR(srcSize_wrong);
|
|
}
|
|
if (output->pos > output->size) { /* forbidden */
|
|
DEBUGLOG(5, "out: pos: %u vs size: %u",
|
|
(U32)output->pos, (U32)output->size);
|
|
return ERROR(dstSize_tooSmall);
|
|
}
|
|
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 ");
|
|
ZSTD_resetDStream(zds); /* transparent reset on starting decoding a new frame */
|
|
/* 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) {
|
|
/* legacy support is incompatible with static dctx */
|
|
if (zds->staticSize) return ERROR(memory_allocation);
|
|
{ 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) {
|
|
const void* const dict = zds->ddict ? zds->ddict->dictContent : NULL;
|
|
size_t const dictSize = zds->ddict ? zds->ddict->dictSize : 0;
|
|
DEBUGLOG(5, "ZSTD_decompressStream: detected legacy version v0.%u", legacyVersion);
|
|
/* legacy support is incompatible with static dctx */
|
|
if (zds->staticSize) return ERROR(memory_allocation);
|
|
CHECK_F(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, zds->ddict);
|
|
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");
|
|
CHECK_F(ZSTD_decompressBegin_usingDDict(zds, zds->ddict));
|
|
|
|
if ((MEM_readLE32(zds->headerBuffer) & 0xFFFFFFF0U) == ZSTD_MAGIC_SKIPPABLE_START) { /* skippable frame */
|
|
zds->expected = MEM_readLE32(zds->headerBuffer + ZSTD_FRAMEIDSIZE);
|
|
zds->stage = ZSTDds_skipFrame;
|
|
} else {
|
|
CHECK_F(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);
|
|
if (zds->fParams.windowSize > zds->maxWindowSize) return ERROR(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 */
|
|
if (bufferSize > zds->staticSize - sizeof(ZSTD_DCtx))
|
|
return ERROR(memory_allocation);
|
|
} else {
|
|
ZSTD_free(zds->inBuff, zds->customMem);
|
|
zds->inBuffSize = 0;
|
|
zds->outBuffSize = 0;
|
|
zds->inBuff = (char*)ZSTD_malloc(bufferSize, zds->customMem);
|
|
if (zds->inBuff == NULL) return ERROR(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 {
|
|
if (toLoad > zds->inBuffSize - zds->inPos) return ERROR(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: return ERROR(GENERIC); /* impossible */
|
|
} }
|
|
|
|
/* 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) {
|
|
if (op==oend) return ERROR(dstSize_tooSmall);
|
|
if (ip==iend) return ERROR(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_decompress_generic(ZSTD_DCtx* dctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
|
|
{
|
|
return ZSTD_decompressStream(dctx, output, input);
|
|
}
|
|
|
|
size_t ZSTD_decompress_generic_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_decompress_generic(dctx, &output, &input);
|
|
*dstPos = output.pos;
|
|
*srcPos = input.pos;
|
|
return cErr;
|
|
}
|
|
|
|
void ZSTD_DCtx_reset(ZSTD_DCtx* dctx)
|
|
{
|
|
(void)ZSTD_initDStream(dctx);
|
|
dctx->format = ZSTD_f_zstd1;
|
|
dctx->maxWindowSize = ZSTD_MAXWINDOWSIZE_DEFAULT;
|
|
}
|