diff options
Diffstat (limited to 'vendor/github.com/DataDog/zstd/zstd_v05.c')
| -rw-r--r-- | vendor/github.com/DataDog/zstd/zstd_v05.c | 4039 |
1 files changed, 0 insertions, 4039 deletions
diff --git a/vendor/github.com/DataDog/zstd/zstd_v05.c b/vendor/github.com/DataDog/zstd/zstd_v05.c deleted file mode 100644 index caaf15f9b..000000000 --- a/vendor/github.com/DataDog/zstd/zstd_v05.c +++ /dev/null @@ -1,4039 +0,0 @@ -/* - * Copyright (c) 2016-present, Yann Collet, Facebook, Inc. - * All rights reserved. - * - * This source code is licensed under both the BSD-style license (found in the - * LICENSE file in the root directory of this source tree) and the GPLv2 (found - * in the COPYING file in the root directory of this source tree). - * You may select, at your option, one of the above-listed licenses. - */ - - -/*- Dependencies -*/ -#include "zstd_v05.h" -#include "error_private.h" - - -/* ****************************************************************** - mem.h - low-level memory access routines - Copyright (C) 2013-2015, Yann Collet. - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - FSEv05 source repository : https://github.com/Cyan4973/FiniteStateEntropy - - Public forum : https://groups.google.com/forum/#!forum/lz4c -****************************************************************** */ -#ifndef MEM_H_MODULE -#define MEM_H_MODULE - -#if defined (__cplusplus) -extern "C" { -#endif - -/*-**************************************** -* Dependencies -******************************************/ -#include <stddef.h> /* size_t, ptrdiff_t */ -#include <string.h> /* memcpy */ - - -/*-**************************************** -* Compiler specifics -******************************************/ -#if defined(__GNUC__) -# define MEM_STATIC static __attribute__((unused)) -#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) -# define MEM_STATIC static inline -#elif defined(_MSC_VER) -# define MEM_STATIC static __inline -#else -# define MEM_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ -#endif - - -/*-************************************************************** -* Basic Types -*****************************************************************/ -#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) -# include <stdint.h> - typedef uint8_t BYTE; - typedef uint16_t U16; - typedef int16_t S16; - typedef uint32_t U32; - typedef int32_t S32; - typedef uint64_t U64; - typedef int64_t S64; -#else - typedef unsigned char BYTE; - typedef unsigned short U16; - typedef signed short S16; - typedef unsigned int U32; - typedef signed int S32; - typedef unsigned long long U64; - typedef signed long long S64; -#endif - - -/*-************************************************************** -* Memory I/O -*****************************************************************/ -/* MEM_FORCE_MEMORY_ACCESS : - * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable. - * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal. - * The below switch allow to select different access method for improved performance. - * Method 0 (default) : use `memcpy()`. Safe and portable. - * Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable). - * This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`. - * Method 2 : direct access. This method is portable but violate C standard. - * It can generate buggy code on targets depending on alignment. - * In some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6) - * See http://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details. - * Prefer these methods in priority order (0 > 1 > 2) - */ -#ifndef MEM_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */ -# if defined(__GNUC__) && ( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) ) -# define MEM_FORCE_MEMORY_ACCESS 2 -# elif (defined(__INTEL_COMPILER) && !defined(WIN32)) || \ - (defined(__GNUC__) && ( defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) )) -# define MEM_FORCE_MEMORY_ACCESS 1 -# endif -#endif - -MEM_STATIC unsigned MEM_32bits(void) { return sizeof(void*)==4; } -MEM_STATIC unsigned MEM_64bits(void) { return sizeof(void*)==8; } - -MEM_STATIC unsigned MEM_isLittleEndian(void) -{ - const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ - return one.c[0]; -} - -#if defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==2) - -/* violates C standard, by lying on structure alignment. -Only use if no other choice to achieve best performance on target platform */ -MEM_STATIC U16 MEM_read16(const void* memPtr) { return *(const U16*) memPtr; } -MEM_STATIC U32 MEM_read32(const void* memPtr) { return *(const U32*) memPtr; } -MEM_STATIC U64 MEM_read64(const void* memPtr) { return *(const U64*) memPtr; } - -MEM_STATIC void MEM_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; } -MEM_STATIC void MEM_write32(void* memPtr, U32 value) { *(U32*)memPtr = value; } -MEM_STATIC void MEM_write64(void* memPtr, U64 value) { *(U64*)memPtr = value; } - -#elif defined(MEM_FORCE_MEMORY_ACCESS) && (MEM_FORCE_MEMORY_ACCESS==1) - -/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */ -/* currently only defined for gcc and icc */ -typedef union { U16 u16; U32 u32; U64 u64; size_t st; } __attribute__((packed)) unalign; - -MEM_STATIC U16 MEM_read16(const void* ptr) { return ((const unalign*)ptr)->u16; } -MEM_STATIC U32 MEM_read32(const void* ptr) { return ((const unalign*)ptr)->u32; } -MEM_STATIC U64 MEM_read64(const void* ptr) { return ((const unalign*)ptr)->u64; } - -MEM_STATIC void MEM_write16(void* memPtr, U16 value) { ((unalign*)memPtr)->u16 = value; } -MEM_STATIC void MEM_write32(void* memPtr, U32 value) { ((unalign*)memPtr)->u32 = value; } -MEM_STATIC void MEM_write64(void* memPtr, U64 value) { ((unalign*)memPtr)->u64 = value; } - -#else - -/* default method, safe and standard. - can sometimes prove slower */ - -MEM_STATIC U16 MEM_read16(const void* memPtr) -{ - U16 val; memcpy(&val, memPtr, sizeof(val)); return val; -} - -MEM_STATIC U32 MEM_read32(const void* memPtr) -{ - U32 val; memcpy(&val, memPtr, sizeof(val)); return val; -} - -MEM_STATIC U64 MEM_read64(const void* memPtr) -{ - U64 val; memcpy(&val, memPtr, sizeof(val)); return val; -} - -MEM_STATIC void MEM_write16(void* memPtr, U16 value) -{ - memcpy(memPtr, &value, sizeof(value)); -} - -MEM_STATIC void MEM_write32(void* memPtr, U32 value) -{ - memcpy(memPtr, &value, sizeof(value)); -} - -MEM_STATIC void MEM_write64(void* memPtr, U64 value) -{ - memcpy(memPtr, &value, sizeof(value)); -} - -#endif /* MEM_FORCE_MEMORY_ACCESS */ - - -MEM_STATIC U16 MEM_readLE16(const void* memPtr) -{ - if (MEM_isLittleEndian()) - return MEM_read16(memPtr); - else { - const BYTE* p = (const BYTE*)memPtr; - return (U16)(p[0] + (p[1]<<8)); - } -} - -MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val) -{ - if (MEM_isLittleEndian()) { - MEM_write16(memPtr, val); - } else { - BYTE* p = (BYTE*)memPtr; - p[0] = (BYTE)val; - p[1] = (BYTE)(val>>8); - } -} - -MEM_STATIC U32 MEM_readLE32(const void* memPtr) -{ - if (MEM_isLittleEndian()) - return MEM_read32(memPtr); - else { - const BYTE* p = (const BYTE*)memPtr; - return (U32)((U32)p[0] + ((U32)p[1]<<8) + ((U32)p[2]<<16) + ((U32)p[3]<<24)); - } -} - - -MEM_STATIC U64 MEM_readLE64(const void* memPtr) -{ - if (MEM_isLittleEndian()) - return MEM_read64(memPtr); - else { - const BYTE* p = (const BYTE*)memPtr; - return (U64)((U64)p[0] + ((U64)p[1]<<8) + ((U64)p[2]<<16) + ((U64)p[3]<<24) - + ((U64)p[4]<<32) + ((U64)p[5]<<40) + ((U64)p[6]<<48) + ((U64)p[7]<<56)); - } -} - - -MEM_STATIC size_t MEM_readLEST(const void* memPtr) -{ - if (MEM_32bits()) - return (size_t)MEM_readLE32(memPtr); - else - return (size_t)MEM_readLE64(memPtr); -} - - -#if defined (__cplusplus) -} -#endif - -#endif /* MEM_H_MODULE */ - -/* - zstd - standard compression library - Header File for static linking only - Copyright (C) 2014-2016, Yann Collet. - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - zstd homepage : http://www.zstd.net -*/ -#ifndef ZSTD_STATIC_H -#define ZSTD_STATIC_H - -/* The prototypes defined within this file are considered experimental. - * They should not be used in the context DLL as they may change in the future. - * Prefer static linking if you need them, to control breaking version changes issues. - */ - -#if defined (__cplusplus) -extern "C" { -#endif - - - -/*-************************************* -* Types -***************************************/ -#define ZSTDv05_WINDOWLOG_ABSOLUTEMIN 11 - - -/*-************************************* -* Advanced functions -***************************************/ -/*- Advanced Decompression functions -*/ - -/*! ZSTDv05_decompress_usingPreparedDCtx() : -* Same as ZSTDv05_decompress_usingDict, but using a reference context `preparedDCtx`, where dictionary has been loaded. -* It avoids reloading the dictionary each time. -* `preparedDCtx` must have been properly initialized using ZSTDv05_decompressBegin_usingDict(). -* Requires 2 contexts : 1 for reference, which will not be modified, and 1 to run the decompression operation */ -size_t ZSTDv05_decompress_usingPreparedDCtx( - ZSTDv05_DCtx* dctx, const ZSTDv05_DCtx* preparedDCtx, - void* dst, size_t dstCapacity, - const void* src, size_t srcSize); - - -/* ************************************** -* Streaming functions (direct mode) -****************************************/ -size_t ZSTDv05_decompressBegin(ZSTDv05_DCtx* dctx); - -/* - Streaming decompression, direct mode (bufferless) - - A ZSTDv05_DCtx object is required to track streaming operations. - Use ZSTDv05_createDCtx() / ZSTDv05_freeDCtx() to manage it. - A ZSTDv05_DCtx object can be re-used multiple times. - - First typical operation is to retrieve frame parameters, using ZSTDv05_getFrameParams(). - This operation is independent, and just needs enough input data to properly decode the frame header. - Objective is to retrieve *params.windowlog, to know minimum amount of memory required during decoding. - Result : 0 when successful, it means the ZSTDv05_parameters structure has been filled. - >0 : means there is not enough data into src. Provides the expected size to successfully decode header. - errorCode, which can be tested using ZSTDv05_isError() - - Start decompression, with ZSTDv05_decompressBegin() or ZSTDv05_decompressBegin_usingDict() - Alternatively, you can copy a prepared context, using ZSTDv05_copyDCtx() - - Then use ZSTDv05_nextSrcSizeToDecompress() and ZSTDv05_decompressContinue() alternatively. - ZSTDv05_nextSrcSizeToDecompress() tells how much bytes to provide as 'srcSize' to ZSTDv05_decompressContinue(). - ZSTDv05_decompressContinue() requires this exact amount of bytes, or it will fail. - ZSTDv05_decompressContinue() needs previous data blocks during decompression, up to (1 << windowlog). - They should preferably be located contiguously, prior to current block. Alternatively, a round buffer is also possible. - - @result of ZSTDv05_decompressContinue() is the number of bytes regenerated within 'dst'. - It can be zero, which is not an error; it just means ZSTDv05_decompressContinue() has decoded some header. - - A frame is fully decoded when ZSTDv05_nextSrcSizeToDecompress() returns zero. - Context can then be reset to start a new decompression. -*/ - - -/* ************************************** -* Block functions -****************************************/ -/*! Block functions produce and decode raw zstd blocks, without frame metadata. - User will have to take in charge required information to regenerate data, such as block sizes. - - A few rules to respect : - - Uncompressed block size must be <= 128 KB - - Compressing or decompressing requires a context structure - + Use ZSTDv05_createCCtx() and ZSTDv05_createDCtx() - - It is necessary to init context before starting - + compression : ZSTDv05_compressBegin() - + decompression : ZSTDv05_decompressBegin() - + variants _usingDict() are also allowed - + copyCCtx() and copyDCtx() work too - - When a block is considered not compressible enough, ZSTDv05_compressBlock() result will be zero. - In which case, nothing is produced into `dst`. - + User must test for such outcome and deal directly with uncompressed data - + ZSTDv05_decompressBlock() doesn't accept uncompressed data as input !! -*/ - -size_t ZSTDv05_decompressBlock(ZSTDv05_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); - - - - -#if defined (__cplusplus) -} -#endif - -#endif /* ZSTDv05_STATIC_H */ - - -/* - zstd_internal - common functions to include - Header File for include - Copyright (C) 2014-2016, Yann Collet. - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - zstd source repository : https://github.com/Cyan4973/zstd -*/ -#ifndef ZSTD_CCOMMON_H_MODULE -#define ZSTD_CCOMMON_H_MODULE - - - -/*-************************************* -* Common macros -***************************************/ -#define MIN(a,b) ((a)<(b) ? (a) : (b)) -#define MAX(a,b) ((a)>(b) ? (a) : (b)) - - -/*-************************************* -* Common constants -***************************************/ -#define ZSTDv05_DICT_MAGIC 0xEC30A435 - -#define KB *(1 <<10) -#define MB *(1 <<20) -#define GB *(1U<<30) - -#define BLOCKSIZE (128 KB) /* define, for static allocation */ - -static const size_t ZSTDv05_blockHeaderSize = 3; -static const size_t ZSTDv05_frameHeaderSize_min = 5; -#define ZSTDv05_frameHeaderSize_max 5 /* define, for static allocation */ - -#define BITv057 128 -#define BITv056 64 -#define BITv055 32 -#define BITv054 16 -#define BITv051 2 -#define BITv050 1 - -#define IS_HUFv05 0 -#define IS_PCH 1 -#define IS_RAW 2 -#define IS_RLE 3 - -#define MINMATCH 4 -#define REPCODE_STARTVALUE 1 - -#define Litbits 8 -#define MLbits 7 -#define LLbits 6 -#define Offbits 5 -#define MaxLit ((1<<Litbits) - 1) -#define MaxML ((1<<MLbits) - 1) -#define MaxLL ((1<<LLbits) - 1) -#define MaxOff ((1<<Offbits)- 1) -#define MLFSEv05Log 10 -#define LLFSEv05Log 10 -#define OffFSEv05Log 9 -#define MaxSeq MAX(MaxLL, MaxML) - -#define FSEv05_ENCODING_RAW 0 -#define FSEv05_ENCODING_RLE 1 -#define FSEv05_ENCODING_STATIC 2 -#define FSEv05_ENCODING_DYNAMIC 3 - - -#define HufLog 12 - -#define MIN_SEQUENCES_SIZE 1 /* nbSeq==0 */ -#define MIN_CBLOCK_SIZE (1 /*litCSize*/ + 1 /* RLE or RAW */ + MIN_SEQUENCES_SIZE /* nbSeq==0 */) /* for a non-null block */ - -#define WILDCOPY_OVERLENGTH 8 - -#define ZSTD_CONTENTSIZE_ERROR (0ULL - 2) - -typedef enum { bt_compressed, bt_raw, bt_rle, bt_end } blockType_t; - - -/*-******************************************* -* Shared functions to include for inlining -*********************************************/ -static void ZSTDv05_copy8(void* dst, const void* src) { memcpy(dst, src, 8); } - -#define COPY8(d,s) { ZSTDv05_copy8(d,s); d+=8; s+=8; } - -/*! ZSTDv05_wildcopy() : -* custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) */ -MEM_STATIC void ZSTDv05_wildcopy(void* dst, const void* src, ptrdiff_t length) -{ - const BYTE* ip = (const BYTE*)src; - BYTE* op = (BYTE*)dst; - BYTE* const oend = op + length; - do - COPY8(op, ip) - while (op < oend); -} - - -/*-******************************************* -* Private interfaces -*********************************************/ -typedef struct { - void* buffer; - U32* offsetStart; - U32* offset; - BYTE* offCodeStart; - BYTE* offCode; - BYTE* litStart; - BYTE* lit; - BYTE* litLengthStart; - BYTE* litLength; - BYTE* matchLengthStart; - BYTE* matchLength; - BYTE* dumpsStart; - BYTE* dumps; - /* opt */ - U32* matchLengthFreq; - U32* litLengthFreq; - U32* litFreq; - U32* offCodeFreq; - U32 matchLengthSum; - U32 litLengthSum; - U32 litSum; - U32 offCodeSum; -} seqStore_t; - - - -#endif /* ZSTDv05_CCOMMON_H_MODULE */ -/* ****************************************************************** - FSEv05 : Finite State Entropy coder - header file - Copyright (C) 2013-2015, Yann Collet. - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - Source repository : https://github.com/Cyan4973/FiniteStateEntropy - - Public forum : https://groups.google.com/forum/#!forum/lz4c -****************************************************************** */ -#ifndef FSEv05_H -#define FSEv05_H - -#if defined (__cplusplus) -extern "C" { -#endif - - -/* ***************************************** -* Includes -******************************************/ -#include <stddef.h> /* size_t, ptrdiff_t */ - - -/*-**************************************** -* FSEv05 simple functions -******************************************/ -size_t FSEv05_decompress(void* dst, size_t maxDstSize, - const void* cSrc, size_t cSrcSize); -/*! -FSEv05_decompress(): - Decompress FSEv05 data from buffer 'cSrc', of size 'cSrcSize', - into already allocated destination buffer 'dst', of size 'maxDstSize'. - return : size of regenerated data (<= maxDstSize) - or an error code, which can be tested using FSEv05_isError() - - ** Important ** : FSEv05_decompress() doesn't decompress non-compressible nor RLE data !!! - Why ? : making this distinction requires a header. - Header management is intentionally delegated to the user layer, which can better manage special cases. -*/ - - -/* ***************************************** -* Tool functions -******************************************/ -/* Error Management */ -unsigned FSEv05_isError(size_t code); /* tells if a return value is an error code */ -const char* FSEv05_getErrorName(size_t code); /* provides error code string (useful for debugging) */ - - - - -/* ***************************************** -* FSEv05 detailed API -******************************************/ -/* *** DECOMPRESSION *** */ - -/*! -FSEv05_readNCount(): - Read compactly saved 'normalizedCounter' from 'rBuffer'. - return : size read from 'rBuffer' - or an errorCode, which can be tested using FSEv05_isError() - maxSymbolValuePtr[0] and tableLogPtr[0] will also be updated with their respective values */ -size_t FSEv05_readNCount (short* normalizedCounter, unsigned* maxSymbolValuePtr, unsigned* tableLogPtr, const void* rBuffer, size_t rBuffSize); - -/*! -Constructor and Destructor of type FSEv05_DTable - Note that its size depends on 'tableLog' */ -typedef unsigned FSEv05_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */ -FSEv05_DTable* FSEv05_createDTable(unsigned tableLog); -void FSEv05_freeDTable(FSEv05_DTable* dt); - -/*! -FSEv05_buildDTable(): - Builds 'dt', which must be already allocated, using FSEv05_createDTable() - @return : 0, - or an errorCode, which can be tested using FSEv05_isError() */ -size_t FSEv05_buildDTable (FSEv05_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog); - -/*! -FSEv05_decompress_usingDTable(): - Decompress compressed source @cSrc of size @cSrcSize using `dt` - into `dst` which must be already allocated. - @return : size of regenerated data (necessarily <= @dstCapacity) - or an errorCode, which can be tested using FSEv05_isError() */ -size_t FSEv05_decompress_usingDTable(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, const FSEv05_DTable* dt); - - - -#if defined (__cplusplus) -} -#endif - -#endif /* FSEv05_H */ -/* ****************************************************************** - bitstream - Part of FSEv05 library - header file (to include) - Copyright (C) 2013-2016, Yann Collet. - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - Source repository : https://github.com/Cyan4973/FiniteStateEntropy -****************************************************************** */ -#ifndef BITv05STREAM_H_MODULE -#define BITv05STREAM_H_MODULE - -#if defined (__cplusplus) -extern "C" { -#endif - - -/* -* This API consists of small unitary functions, which highly benefit from being inlined. -* Since link-time-optimization is not available for all compilers, -* these functions are defined into a .h to be included. -*/ - - - -/*-******************************************** -* bitStream decoding API (read backward) -**********************************************/ -typedef struct -{ - size_t bitContainer; - unsigned bitsConsumed; - const char* ptr; - const char* start; -} BITv05_DStream_t; - -typedef enum { BITv05_DStream_unfinished = 0, - BITv05_DStream_endOfBuffer = 1, - BITv05_DStream_completed = 2, - BITv05_DStream_overflow = 3 } BITv05_DStream_status; /* result of BITv05_reloadDStream() */ - /* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */ - -MEM_STATIC size_t BITv05_initDStream(BITv05_DStream_t* bitD, const void* srcBuffer, size_t srcSize); -MEM_STATIC size_t BITv05_readBits(BITv05_DStream_t* bitD, unsigned nbBits); -MEM_STATIC BITv05_DStream_status BITv05_reloadDStream(BITv05_DStream_t* bitD); -MEM_STATIC unsigned BITv05_endOfDStream(const BITv05_DStream_t* bitD); - - -/*-**************************************** -* unsafe API -******************************************/ -MEM_STATIC size_t BITv05_readBitsFast(BITv05_DStream_t* bitD, unsigned nbBits); -/* faster, but works only if nbBits >= 1 */ - - - -/*-************************************************************** -* Helper functions -****************************************************************/ -MEM_STATIC unsigned BITv05_highbit32 (U32 val) -{ -# if defined(_MSC_VER) /* Visual */ - unsigned long r=0; - _BitScanReverse ( &r, val ); - return (unsigned) r; -# elif defined(__GNUC__) && (__GNUC__ >= 3) /* Use GCC Intrinsic */ - return 31 - __builtin_clz (val); -# else /* Software version */ - static const unsigned DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 }; - U32 v = val; - unsigned r; - v |= v >> 1; - v |= v >> 2; - v |= v >> 4; - v |= v >> 8; - v |= v >> 16; - r = DeBruijnClz[ (U32) (v * 0x07C4ACDDU) >> 27]; - return r; -# endif -} - - - -/*-******************************************************** -* bitStream decoding -**********************************************************/ -/*!BITv05_initDStream -* Initialize a BITv05_DStream_t. -* @bitD : a pointer to an already allocated BITv05_DStream_t structure -* @srcBuffer must point at the beginning of a bitStream -* @srcSize must be the exact size of the bitStream -* @result : size of stream (== srcSize) or an errorCode if a problem is detected -*/ -MEM_STATIC size_t BITv05_initDStream(BITv05_DStream_t* bitD, const void* srcBuffer, size_t srcSize) -{ - if (srcSize < 1) { memset(bitD, 0, sizeof(*bitD)); return ERROR(srcSize_wrong); } - - if (srcSize >= sizeof(size_t)) { /* normal case */ - U32 contain32; - bitD->start = (const char*)srcBuffer; - bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(size_t); - bitD->bitContainer = MEM_readLEST(bitD->ptr); - contain32 = ((const BYTE*)srcBuffer)[srcSize-1]; - if (contain32 == 0) return ERROR(GENERIC); /* endMark not present */ - bitD->bitsConsumed = 8 - BITv05_highbit32(contain32); - } else { - U32 contain32; - bitD->start = (const char*)srcBuffer; - bitD->ptr = bitD->start; - bitD->bitContainer = *(const BYTE*)(bitD->start); - switch(srcSize) - { - case 7: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[6]) << (sizeof(size_t)*8 - 16);/* fall-through */ - case 6: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[5]) << (sizeof(size_t)*8 - 24);/* fall-through */ - case 5: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[4]) << (sizeof(size_t)*8 - 32);/* fall-through */ - case 4: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[3]) << 24; /* fall-through */ - case 3: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[2]) << 16; /* fall-through */ - case 2: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[1]) << 8; /* fall-through */ - default: break; - } - contain32 = ((const BYTE*)srcBuffer)[srcSize-1]; - if (contain32 == 0) return ERROR(GENERIC); /* endMark not present */ - bitD->bitsConsumed = 8 - BITv05_highbit32(contain32); - bitD->bitsConsumed += (U32)(sizeof(size_t) - srcSize)*8; - } - - return srcSize; -} - -MEM_STATIC size_t BITv05_lookBits(BITv05_DStream_t* bitD, U32 nbBits) -{ - const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1; - return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask); -} - -/*! BITv05_lookBitsFast : -* unsafe version; only works only if nbBits >= 1 */ -MEM_STATIC size_t BITv05_lookBitsFast(BITv05_DStream_t* bitD, U32 nbBits) -{ - const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1; - return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask+1)-nbBits) & bitMask); -} - -MEM_STATIC void BITv05_skipBits(BITv05_DStream_t* bitD, U32 nbBits) -{ - bitD->bitsConsumed += nbBits; -} - -MEM_STATIC size_t BITv05_readBits(BITv05_DStream_t* bitD, unsigned nbBits) -{ - size_t value = BITv05_lookBits(bitD, nbBits); - BITv05_skipBits(bitD, nbBits); - return value; -} - -/*!BITv05_readBitsFast : -* unsafe version; only works only if nbBits >= 1 */ -MEM_STATIC size_t BITv05_readBitsFast(BITv05_DStream_t* bitD, unsigned nbBits) -{ - size_t value = BITv05_lookBitsFast(bitD, nbBits); - BITv05_skipBits(bitD, nbBits); - return value; -} - -MEM_STATIC BITv05_DStream_status BITv05_reloadDStream(BITv05_DStream_t* bitD) -{ - if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should never happen */ - return BITv05_DStream_overflow; - - if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) { - bitD->ptr -= bitD->bitsConsumed >> 3; - bitD->bitsConsumed &= 7; - bitD->bitContainer = MEM_readLEST(bitD->ptr); - return BITv05_DStream_unfinished; - } - if (bitD->ptr == bitD->start) { - if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return BITv05_DStream_endOfBuffer; - return BITv05_DStream_completed; - } - { - U32 nbBytes = bitD->bitsConsumed >> 3; - BITv05_DStream_status result = BITv05_DStream_unfinished; - if (bitD->ptr - nbBytes < bitD->start) { - nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */ - result = BITv05_DStream_endOfBuffer; - } - bitD->ptr -= nbBytes; - bitD->bitsConsumed -= nbBytes*8; - bitD->bitContainer = MEM_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */ - return result; - } -} - -/*! BITv05_endOfDStream -* @return Tells if DStream has reached its exact end -*/ -MEM_STATIC unsigned BITv05_endOfDStream(const BITv05_DStream_t* DStream) -{ - return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer)*8)); -} - -#if defined (__cplusplus) -} -#endif - -#endif /* BITv05STREAM_H_MODULE */ -/* ****************************************************************** - FSEv05 : Finite State Entropy coder - header file for static linking (only) - Copyright (C) 2013-2015, Yann Collet - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - Source repository : https://github.com/Cyan4973/FiniteStateEntropy - - Public forum : https://groups.google.com/forum/#!forum/lz4c -****************************************************************** */ -#ifndef FSEv05_STATIC_H -#define FSEv05_STATIC_H - -#if defined (__cplusplus) -extern "C" { -#endif - - - -/* ***************************************** -* Static allocation -*******************************************/ -/* It is possible to statically allocate FSEv05 CTable/DTable as a table of unsigned using below macros */ -#define FSEv05_DTABLE_SIZE_U32(maxTableLog) (1 + (1<<maxTableLog)) - - -/* ***************************************** -* FSEv05 advanced API -*******************************************/ -size_t FSEv05_buildDTable_raw (FSEv05_DTable* dt, unsigned nbBits); -/* build a fake FSEv05_DTable, designed to read an uncompressed bitstream where each symbol uses nbBits */ - -size_t FSEv05_buildDTable_rle (FSEv05_DTable* dt, unsigned char symbolValue); -/* build a fake FSEv05_DTable, designed to always generate the same symbolValue */ - - - -/* ***************************************** -* FSEv05 symbol decompression API -*******************************************/ -typedef struct -{ - size_t state; - const void* table; /* precise table may vary, depending on U16 */ -} FSEv05_DState_t; - - -static void FSEv05_initDState(FSEv05_DState_t* DStatePtr, BITv05_DStream_t* bitD, const FSEv05_DTable* dt); - -static unsigned char FSEv05_decodeSymbol(FSEv05_DState_t* DStatePtr, BITv05_DStream_t* bitD); - -static unsigned FSEv05_endOfDState(const FSEv05_DState_t* DStatePtr); - - - -/* ***************************************** -* FSEv05 unsafe API -*******************************************/ -static unsigned char FSEv05_decodeSymbolFast(FSEv05_DState_t* DStatePtr, BITv05_DStream_t* bitD); -/* faster, but works only if nbBits is always >= 1 (otherwise, result will be corrupted) */ - - -/* ***************************************** -* Implementation of inlined functions -*******************************************/ -/* decompression */ - -typedef struct { - U16 tableLog; - U16 fastMode; -} FSEv05_DTableHeader; /* sizeof U32 */ - -typedef struct -{ - unsigned short newState; - unsigned char symbol; - unsigned char nbBits; -} FSEv05_decode_t; /* size == U32 */ - -MEM_STATIC void FSEv05_initDState(FSEv05_DState_t* DStatePtr, BITv05_DStream_t* bitD, const FSEv05_DTable* dt) -{ - const void* ptr = dt; - const FSEv05_DTableHeader* const DTableH = (const FSEv05_DTableHeader*)ptr; - DStatePtr->state = BITv05_readBits(bitD, DTableH->tableLog); - BITv05_reloadDStream(bitD); - DStatePtr->table = dt + 1; -} - -MEM_STATIC BYTE FSEv05_peakSymbol(FSEv05_DState_t* DStatePtr) -{ - const FSEv05_decode_t DInfo = ((const FSEv05_decode_t*)(DStatePtr->table))[DStatePtr->state]; - return DInfo.symbol; -} - -MEM_STATIC BYTE FSEv05_decodeSymbol(FSEv05_DState_t* DStatePtr, BITv05_DStream_t* bitD) -{ - const FSEv05_decode_t DInfo = ((const FSEv05_decode_t*)(DStatePtr->table))[DStatePtr->state]; - const U32 nbBits = DInfo.nbBits; - BYTE symbol = DInfo.symbol; - size_t lowBits = BITv05_readBits(bitD, nbBits); - - DStatePtr->state = DInfo.newState + lowBits; - return symbol; -} - -MEM_STATIC BYTE FSEv05_decodeSymbolFast(FSEv05_DState_t* DStatePtr, BITv05_DStream_t* bitD) -{ - const FSEv05_decode_t DInfo = ((const FSEv05_decode_t*)(DStatePtr->table))[DStatePtr->state]; - const U32 nbBits = DInfo.nbBits; - BYTE symbol = DInfo.symbol; - size_t lowBits = BITv05_readBitsFast(bitD, nbBits); - - DStatePtr->state = DInfo.newState + lowBits; - return symbol; -} - -MEM_STATIC unsigned FSEv05_endOfDState(const FSEv05_DState_t* DStatePtr) -{ - return DStatePtr->state == 0; -} - - -#if defined (__cplusplus) -} -#endif - -#endif /* FSEv05_STATIC_H */ -/* ****************************************************************** - FSEv05 : Finite State Entropy coder - Copyright (C) 2013-2015, Yann Collet. - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - FSEv05 source repository : https://github.com/Cyan4973/FiniteStateEntropy - - Public forum : https://groups.google.com/forum/#!forum/lz4c -****************************************************************** */ - -#ifndef FSEv05_COMMONDEFS_ONLY - -/* ************************************************************** -* Tuning parameters -****************************************************************/ -/*!MEMORY_USAGE : -* Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) -* Increasing memory usage improves compression ratio -* Reduced memory usage can improve speed, due to cache effect -* Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */ -#define FSEv05_MAX_MEMORY_USAGE 14 -#define FSEv05_DEFAULT_MEMORY_USAGE 13 - -/*!FSEv05_MAX_SYMBOL_VALUE : -* Maximum symbol value authorized. -* Required for proper stack allocation */ -#define FSEv05_MAX_SYMBOL_VALUE 255 - - -/* ************************************************************** -* template functions type & suffix -****************************************************************/ -#define FSEv05_FUNCTION_TYPE BYTE -#define FSEv05_FUNCTION_EXTENSION -#define FSEv05_DECODE_TYPE FSEv05_decode_t - - -#endif /* !FSEv05_COMMONDEFS_ONLY */ - -/* ************************************************************** -* Compiler specifics -****************************************************************/ -#ifdef _MSC_VER /* Visual Studio */ -# define FORCE_INLINE static __forceinline -# include <intrin.h> /* For Visual 2005 */ -# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ -# pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */ -#else -# if defined (__cplusplus) || defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ -# ifdef __GNUC__ -# define FORCE_INLINE static inline __attribute__((always_inline)) -# else -# define FORCE_INLINE static inline -# endif -# else -# define FORCE_INLINE static -# endif /* __STDC_VERSION__ */ -#endif - - -/* ************************************************************** -* Includes -****************************************************************/ -#include <stdlib.h> /* malloc, free, qsort */ -#include <string.h> /* memcpy, memset */ -#include <stdio.h> /* printf (debug) */ - - - -/* *************************************************************** -* Constants -*****************************************************************/ -#define FSEv05_MAX_TABLELOG (FSEv05_MAX_MEMORY_USAGE-2) -#define FSEv05_MAX_TABLESIZE (1U<<FSEv05_MAX_TABLELOG) -#define FSEv05_MAXTABLESIZE_MASK (FSEv05_MAX_TABLESIZE-1) -#define FSEv05_DEFAULT_TABLELOG (FSEv05_DEFAULT_MEMORY_USAGE-2) -#define FSEv05_MIN_TABLELOG 5 - -#define FSEv05_TABLELOG_ABSOLUTE_MAX 15 -#if FSEv05_MAX_TABLELOG > FSEv05_TABLELOG_ABSOLUTE_MAX -#error "FSEv05_MAX_TABLELOG > FSEv05_TABLELOG_ABSOLUTE_MAX is not supported" -#endif - - -/* ************************************************************** -* Error Management -****************************************************************/ -#define FSEv05_STATIC_ASSERT(c) { enum { FSEv05_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ - - -/* ************************************************************** -* Complex types -****************************************************************/ -typedef unsigned DTable_max_t[FSEv05_DTABLE_SIZE_U32(FSEv05_MAX_TABLELOG)]; - - -/* ************************************************************** -* Templates -****************************************************************/ -/* - designed to be included - for type-specific functions (template emulation in C) - Objective is to write these functions only once, for improved maintenance -*/ - -/* safety checks */ -#ifndef FSEv05_FUNCTION_EXTENSION -# error "FSEv05_FUNCTION_EXTENSION must be defined" -#endif -#ifndef FSEv05_FUNCTION_TYPE -# error "FSEv05_FUNCTION_TYPE must be defined" -#endif - -/* Function names */ -#define FSEv05_CAT(X,Y) X##Y -#define FSEv05_FUNCTION_NAME(X,Y) FSEv05_CAT(X,Y) -#define FSEv05_TYPE_NAME(X,Y) FSEv05_CAT(X,Y) - - -/* Function templates */ -static U32 FSEv05_tableStep(U32 tableSize) { return (tableSize>>1) + (tableSize>>3) + 3; } - - - -FSEv05_DTable* FSEv05_createDTable (unsigned tableLog) -{ - if (tableLog > FSEv05_TABLELOG_ABSOLUTE_MAX) tableLog = FSEv05_TABLELOG_ABSOLUTE_MAX; - return (FSEv05_DTable*)malloc( FSEv05_DTABLE_SIZE_U32(tableLog) * sizeof (U32) ); -} - -void FSEv05_freeDTable (FSEv05_DTable* dt) -{ - free(dt); -} - -size_t FSEv05_buildDTable(FSEv05_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) -{ - FSEv05_DTableHeader DTableH; - void* const tdPtr = dt+1; /* because dt is unsigned, 32-bits aligned on 32-bits */ - FSEv05_DECODE_TYPE* const tableDecode = (FSEv05_DECODE_TYPE*) (tdPtr); - const U32 tableSize = 1 << tableLog; - const U32 tableMask = tableSize-1; - const U32 step = FSEv05_tableStep(tableSize); - U16 symbolNext[FSEv05_MAX_SYMBOL_VALUE+1]; - U32 position = 0; - U32 highThreshold = tableSize-1; - const S16 largeLimit= (S16)(1 << (tableLog-1)); - U32 noLarge = 1; - U32 s; - - /* Sanity Checks */ - if (maxSymbolValue > FSEv05_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge); - if (tableLog > FSEv05_MAX_TABLELOG) return ERROR(tableLog_tooLarge); - - /* Init, lay down lowprob symbols */ - memset(tableDecode, 0, sizeof(FSEv05_FUNCTION_TYPE) * (maxSymbolValue+1) ); /* useless init, but keep static analyzer happy, and we don't need to performance optimize legacy decoders */ - DTableH.tableLog = (U16)tableLog; - for (s=0; s<=maxSymbolValue; s++) { - if (normalizedCounter[s]==-1) { - tableDecode[highThreshold--].symbol = (FSEv05_FUNCTION_TYPE)s; - symbolNext[s] = 1; - } else { - if (normalizedCounter[s] >= largeLimit) noLarge=0; - symbolNext[s] = normalizedCounter[s]; - } } - - /* Spread symbols */ - for (s=0; s<=maxSymbolValue; s++) { - int i; - for (i=0; i<normalizedCounter[s]; i++) { - tableDecode[position].symbol = (FSEv05_FUNCTION_TYPE)s; - position = (position + step) & tableMask; - while (position > highThreshold) position = (position + step) & tableMask; /* lowprob area */ - } } - - if (position!=0) return ERROR(GENERIC); /* position must reach all cells once, otherwise normalizedCounter is incorrect */ - - /* Build Decoding table */ - { - U32 i; - for (i=0; i<tableSize; i++) { - FSEv05_FUNCTION_TYPE symbol = (FSEv05_FUNCTION_TYPE)(tableDecode[i].symbol); - U16 nextState = symbolNext[symbol]++; - tableDecode[i].nbBits = (BYTE) (tableLog - BITv05_highbit32 ((U32)nextState) ); - tableDecode[i].newState = (U16) ( (nextState << tableDecode[i].nbBits) - tableSize); - } } - - DTableH.fastMode = (U16)noLarge; - memcpy(dt, &DTableH, sizeof(DTableH)); - return 0; -} - - -#ifndef FSEv05_COMMONDEFS_ONLY -/*-**************************************** -* FSEv05 helper functions -******************************************/ -unsigned FSEv05_isError(size_t code) { return ERR_isError(code); } - -const char* FSEv05_getErrorName(size_t code) { return ERR_getErrorName(code); } - - -/*-************************************************************** -* FSEv05 NCount encoding-decoding -****************************************************************/ -static short FSEv05_abs(short a) { return a<0 ? -a : a; } - - -size_t FSEv05_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr, - const void* headerBuffer, size_t hbSize) -{ - const BYTE* const istart = (const BYTE*) headerBuffer; - const BYTE* const iend = istart + hbSize; - const BYTE* ip = istart; - int nbBits; - int remaining; - int threshold; - U32 bitStream; - int bitCount; - unsigned charnum = 0; - int previous0 = 0; - - if (hbSize < 4) return ERROR(srcSize_wrong); - bitStream = MEM_readLE32(ip); - nbBits = (bitStream & 0xF) + FSEv05_MIN_TABLELOG; /* extract tableLog */ - if (nbBits > FSEv05_TABLELOG_ABSOLUTE_MAX) return ERROR(tableLog_tooLarge); - bitStream >>= 4; - bitCount = 4; - *tableLogPtr = nbBits; - remaining = (1<<nbBits)+1; - threshold = 1<<nbBits; - nbBits++; - - while ((remaining>1) && (charnum<=*maxSVPtr)) { - if (previous0) { - unsigned n0 = charnum; - while ((bitStream & 0xFFFF) == 0xFFFF) { - n0+=24; - if (ip < iend-5) { - ip+=2; - bitStream = MEM_readLE32(ip) >> bitCount; - } else { - bitStream >>= 16; - bitCount+=16; - } } - while ((bitStream & 3) == 3) { - n0+=3; - bitStream>>=2; - bitCount+=2; - } - n0 += bitStream & 3; - bitCount += 2; - if (n0 > *maxSVPtr) return ERROR(maxSymbolValue_tooSmall); - while (charnum < n0) normalizedCounter[charnum++] = 0; - if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) { - ip += bitCount>>3; - bitCount &= 7; - bitStream = MEM_readLE32(ip) >> bitCount; - } - else - bitStream >>= 2; - } - { - const short max = (short)((2*threshold-1)-remaining); - short count; - - if ((bitStream & (threshold-1)) < (U32)max) { - count = (short)(bitStream & (threshold-1)); - bitCount += nbBits-1; - } else { - count = (short)(bitStream & (2*threshold-1)); - if (count >= threshold) count -= max; - bitCount += nbBits; - } - - count--; /* extra accuracy */ - remaining -= FSEv05_abs(count); - normalizedCounter[charnum++] = count; - previous0 = !count; - while (remaining < threshold) { - nbBits--; - threshold >>= 1; - } - - if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4)) { - ip += bitCount>>3; - bitCount &= 7; - } else { - bitCount -= (int)(8 * (iend - 4 - ip)); - ip = iend - 4; - } - bitStream = MEM_readLE32(ip) >> (bitCount & 31); - } } - if (remaining != 1) return ERROR(GENERIC); - *maxSVPtr = charnum-1; - - ip += (bitCount+7)>>3; - if ((size_t)(ip-istart) > hbSize) return ERROR(srcSize_wrong); - return ip-istart; -} - - - -/*-******************************************************* -* Decompression (Byte symbols) -*********************************************************/ -size_t FSEv05_buildDTable_rle (FSEv05_DTable* dt, BYTE symbolValue) -{ - void* ptr = dt; - FSEv05_DTableHeader* const DTableH = (FSEv05_DTableHeader*)ptr; - void* dPtr = dt + 1; - FSEv05_decode_t* const cell = (FSEv05_decode_t*)dPtr; - - DTableH->tableLog = 0; - DTableH->fastMode = 0; - - cell->newState = 0; - cell->symbol = symbolValue; - cell->nbBits = 0; - - return 0; -} - - -size_t FSEv05_buildDTable_raw (FSEv05_DTable* dt, unsigned nbBits) -{ - void* ptr = dt; - FSEv05_DTableHeader* const DTableH = (FSEv05_DTableHeader*)ptr; - void* dPtr = dt + 1; - FSEv05_decode_t* const dinfo = (FSEv05_decode_t*)dPtr; - const unsigned tableSize = 1 << nbBits; - const unsigned tableMask = tableSize - 1; - const unsigned maxSymbolValue = tableMask; - unsigned s; - - /* Sanity checks */ - if (nbBits < 1) return ERROR(GENERIC); /* min size */ - - /* Build Decoding Table */ - DTableH->tableLog = (U16)nbBits; - DTableH->fastMode = 1; - for (s=0; s<=maxSymbolValue; s++) { - dinfo[s].newState = 0; - dinfo[s].symbol = (BYTE)s; - dinfo[s].nbBits = (BYTE)nbBits; - } - - return 0; -} - -FORCE_INLINE size_t FSEv05_decompress_usingDTable_generic( - void* dst, size_t maxDstSize, - const void* cSrc, size_t cSrcSize, - const FSEv05_DTable* dt, const unsigned fast) -{ - BYTE* const ostart = (BYTE*) dst; - BYTE* op = ostart; - BYTE* const omax = op + maxDstSize; - BYTE* const olimit = omax-3; - - BITv05_DStream_t bitD; - FSEv05_DState_t state1; - FSEv05_DState_t state2; - size_t errorCode; - - /* Init */ - errorCode = BITv05_initDStream(&bitD, cSrc, cSrcSize); /* replaced last arg by maxCompressed Size */ - if (FSEv05_isError(errorCode)) return errorCode; - - FSEv05_initDState(&state1, &bitD, dt); - FSEv05_initDState(&state2, &bitD, dt); - -#define FSEv05_GETSYMBOL(statePtr) fast ? FSEv05_decodeSymbolFast(statePtr, &bitD) : FSEv05_decodeSymbol(statePtr, &bitD) - - /* 4 symbols per loop */ - for ( ; (BITv05_reloadDStream(&bitD)==BITv05_DStream_unfinished) && (op<olimit) ; op+=4) { - op[0] = FSEv05_GETSYMBOL(&state1); - - if (FSEv05_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ - BITv05_reloadDStream(&bitD); - - op[1] = FSEv05_GETSYMBOL(&state2); - - if (FSEv05_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ - { if (BITv05_reloadDStream(&bitD) > BITv05_DStream_unfinished) { op+=2; break; } } - - op[2] = FSEv05_GETSYMBOL(&state1); - - if (FSEv05_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */ - BITv05_reloadDStream(&bitD); - - op[3] = FSEv05_GETSYMBOL(&state2); - } - - /* tail */ - /* note : BITv05_reloadDStream(&bitD) >= FSEv05_DStream_partiallyFilled; Ends at exactly BITv05_DStream_completed */ - while (1) { - if ( (BITv05_reloadDStream(&bitD)>BITv05_DStream_completed) || (op==omax) || (BITv05_endOfDStream(&bitD) && (fast || FSEv05_endOfDState(&state1))) ) - break; - - *op++ = FSEv05_GETSYMBOL(&state1); - - if ( (BITv05_reloadDStream(&bitD)>BITv05_DStream_completed) || (op==omax) || (BITv05_endOfDStream(&bitD) && (fast || FSEv05_endOfDState(&state2))) ) - break; - - *op++ = FSEv05_GETSYMBOL(&state2); - } - - /* end ? */ - if (BITv05_endOfDStream(&bitD) && FSEv05_endOfDState(&state1) && FSEv05_endOfDState(&state2)) - return op-ostart; - - if (op==omax) return ERROR(dstSize_tooSmall); /* dst buffer is full, but cSrc unfinished */ - - return ERROR(corruption_detected); -} - - -size_t FSEv05_decompress_usingDTable(void* dst, size_t originalSize, - const void* cSrc, size_t cSrcSize, - const FSEv05_DTable* dt) -{ - const void* ptr = dt; - const FSEv05_DTableHeader* DTableH = (const FSEv05_DTableHeader*)ptr; - const U32 fastMode = DTableH->fastMode; - - /* select fast mode (static) */ - if (fastMode) return FSEv05_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 1); - return FSEv05_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 0); -} - - -size_t FSEv05_decompress(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize) -{ - const BYTE* const istart = (const BYTE*)cSrc; - const BYTE* ip = istart; - short counting[FSEv05_MAX_SYMBOL_VALUE+1]; - DTable_max_t dt; /* Static analyzer seems unable to understand this table will be properly initialized later */ - unsigned tableLog; - unsigned maxSymbolValue = FSEv05_MAX_SYMBOL_VALUE; - size_t errorCode; - - if (cSrcSize<2) return ERROR(srcSize_wrong); /* too small input size */ - - /* normal FSEv05 decoding mode */ - errorCode = FSEv05_readNCount (counting, &maxSymbolValue, &tableLog, istart, cSrcSize); - if (FSEv05_isError(errorCode)) return errorCode; - if (errorCode >= cSrcSize) return ERROR(srcSize_wrong); /* too small input size */ - ip += errorCode; - cSrcSize -= errorCode; - - errorCode = FSEv05_buildDTable (dt, counting, maxSymbolValue, tableLog); - if (FSEv05_isError(errorCode)) return errorCode; - - /* always return, even if it is an error code */ - return FSEv05_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, dt); -} - - - -#endif /* FSEv05_COMMONDEFS_ONLY */ -/* ****************************************************************** - Huff0 : Huffman coder, part of New Generation Entropy library - header file - Copyright (C) 2013-2016, Yann Collet. - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - Source repository : https://github.com/Cyan4973/FiniteStateEntropy -****************************************************************** */ -#ifndef HUFF0_H -#define HUFF0_H - -#if defined (__cplusplus) -extern "C" { -#endif - - - -/* **************************************** -* Huff0 simple functions -******************************************/ -size_t HUFv05_decompress(void* dst, size_t dstSize, - const void* cSrc, size_t cSrcSize); -/*! -HUFv05_decompress(): - Decompress Huff0 data from buffer 'cSrc', of size 'cSrcSize', - into already allocated destination buffer 'dst', of size 'dstSize'. - @dstSize : must be the **exact** size of original (uncompressed) data. - Note : in contrast with FSEv05, HUFv05_decompress can regenerate - RLE (cSrcSize==1) and uncompressed (cSrcSize==dstSize) data, - because it knows size to regenerate. - @return : size of regenerated data (== dstSize) - or an error code, which can be tested using HUFv05_isError() -*/ - - -/* **************************************** -* Tool functions -******************************************/ -/* Error Management */ -unsigned HUFv05_isError(size_t code); /* tells if a return value is an error code */ -const char* HUFv05_getErrorName(size_t code); /* provides error code string (useful for debugging) */ - - -#if defined (__cplusplus) -} -#endif - -#endif /* HUF0_H */ -/* ****************************************************************** - Huff0 : Huffman codec, part of New Generation Entropy library - header file, for static linking only - Copyright (C) 2013-2016, Yann Collet - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - Source repository : https://github.com/Cyan4973/FiniteStateEntropy -****************************************************************** */ -#ifndef HUF0_STATIC_H -#define HUF0_STATIC_H - -#if defined (__cplusplus) -extern "C" { -#endif - - - -/* **************************************** -* Static allocation -******************************************/ -/* static allocation of Huff0's DTable */ -#define HUFv05_DTABLE_SIZE(maxTableLog) (1 + (1<<maxTableLog)) -#define HUFv05_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \ - unsigned short DTable[HUFv05_DTABLE_SIZE(maxTableLog)] = { maxTableLog } -#define HUFv05_CREATE_STATIC_DTABLEX4(DTable, maxTableLog) \ - unsigned int DTable[HUFv05_DTABLE_SIZE(maxTableLog)] = { maxTableLog } -#define HUFv05_CREATE_STATIC_DTABLEX6(DTable, maxTableLog) \ - unsigned int DTable[HUFv05_DTABLE_SIZE(maxTableLog) * 3 / 2] = { maxTableLog } - - -/* **************************************** -* Advanced decompression functions -******************************************/ -size_t HUFv05_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */ -size_t HUFv05_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbols decoder */ - - -/* **************************************** -* Huff0 detailed API -******************************************/ -/*! -HUFv05_decompress() does the following: -1. select the decompression algorithm (X2, X4, X6) based on pre-computed heuristics -2. build Huffman table from save, using HUFv05_readDTableXn() -3. decode 1 or 4 segments in parallel using HUFv05_decompressSXn_usingDTable -*/ -size_t HUFv05_readDTableX2 (unsigned short* DTable, const void* src, size_t srcSize); -size_t HUFv05_readDTableX4 (unsigned* DTable, const void* src, size_t srcSize); - -size_t HUFv05_decompress4X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const unsigned short* DTable); -size_t HUFv05_decompress4X4_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const unsigned* DTable); - - -/* single stream variants */ - -size_t HUFv05_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */ -size_t HUFv05_decompress1X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbol decoder */ - -size_t HUFv05_decompress1X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const unsigned short* DTable); -size_t HUFv05_decompress1X4_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const unsigned* DTable); - - - -#if defined (__cplusplus) -} -#endif - -#endif /* HUF0_STATIC_H */ -/* ****************************************************************** - Huff0 : Huffman coder, part of New Generation Entropy library - Copyright (C) 2013-2015, Yann Collet. - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - FSEv05+Huff0 source repository : https://github.com/Cyan4973/FiniteStateEntropy - - Public forum : https://groups.google.com/forum/#!forum/lz4c -****************************************************************** */ - -/* ************************************************************** -* Compiler specifics -****************************************************************/ -#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) -/* inline is defined */ -#elif defined(_MSC_VER) -# define inline __inline -#else -# define inline /* disable inline */ -#endif - - -#ifdef _MSC_VER /* Visual Studio */ -# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ -#endif - - -/* ************************************************************** -* Includes -****************************************************************/ -#include <stdlib.h> /* malloc, free, qsort */ -#include <string.h> /* memcpy, memset */ -#include <stdio.h> /* printf (debug) */ - - -/* ************************************************************** -* Constants -****************************************************************/ -#define HUFv05_ABSOLUTEMAX_TABLELOG 16 /* absolute limit of HUFv05_MAX_TABLELOG. Beyond that value, code does not work */ -#define HUFv05_MAX_TABLELOG 12 /* max configured tableLog (for static allocation); can be modified up to HUFv05_ABSOLUTEMAX_TABLELOG */ -#define HUFv05_DEFAULT_TABLELOG HUFv05_MAX_TABLELOG /* tableLog by default, when not specified */ -#define HUFv05_MAX_SYMBOL_VALUE 255 -#if (HUFv05_MAX_TABLELOG > HUFv05_ABSOLUTEMAX_TABLELOG) -# error "HUFv05_MAX_TABLELOG is too large !" -#endif - - -/* ************************************************************** -* Error Management -****************************************************************/ -unsigned HUFv05_isError(size_t code) { return ERR_isError(code); } -const char* HUFv05_getErrorName(size_t code) { return ERR_getErrorName(code); } -#define HUFv05_STATIC_ASSERT(c) { enum { HUFv05_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ - - -/* ******************************************************* -* Huff0 : Huffman block decompression -*********************************************************/ -typedef struct { BYTE byte; BYTE nbBits; } HUFv05_DEltX2; /* single-symbol decoding */ - -typedef struct { U16 sequence; BYTE nbBits; BYTE length; } HUFv05_DEltX4; /* double-symbols decoding */ - -typedef struct { BYTE symbol; BYTE weight; } sortedSymbol_t; - -/*! HUFv05_readStats - Read compact Huffman tree, saved by HUFv05_writeCTable - @huffWeight : destination buffer - @return : size read from `src` -*/ -static size_t HUFv05_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats, - U32* nbSymbolsPtr, U32* tableLogPtr, - const void* src, size_t srcSize) -{ - U32 weightTotal; - U32 tableLog; - const BYTE* ip = (const BYTE*) src; - size_t iSize; - size_t oSize; - U32 n; - - if (!srcSize) return ERROR(srcSize_wrong); - iSize = ip[0]; - //memset(huffWeight, 0, hwSize); /* is not necessary, even though some analyzer complain ... */ - - if (iSize >= 128) { /* special header */ - if (iSize >= (242)) { /* RLE */ - static int l[14] = { 1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, 127, 128 }; - oSize = l[iSize-242]; - memset(huffWeight, 1, hwSize); - iSize = 0; - } - else { /* Incompressible */ - oSize = iSize - 127; - iSize = ((oSize+1)/2); - if (iSize+1 > srcSize) return ERROR(srcSize_wrong); - if (oSize >= hwSize) return ERROR(corruption_detected); - ip += 1; - for (n=0; n<oSize; n+=2) { - huffWeight[n] = ip[n/2] >> 4; - huffWeight[n+1] = ip[n/2] & 15; - } } } - else { /* header compressed with FSEv05 (normal case) */ - if (iSize+1 > srcSize) return ERROR(srcSize_wrong); - oSize = FSEv05_decompress(huffWeight, hwSize-1, ip+1, iSize); /* max (hwSize-1) values decoded, as last one is implied */ - if (FSEv05_isError(oSize)) return oSize; - } - - /* collect weight stats */ - memset(rankStats, 0, (HUFv05_ABSOLUTEMAX_TABLELOG + 1) * sizeof(U32)); - weightTotal = 0; - for (n=0; n<oSize; n++) { - if (huffWeight[n] >= HUFv05_ABSOLUTEMAX_TABLELOG) return ERROR(corruption_detected); - rankStats[huffWeight[n]]++; - weightTotal += (1 << huffWeight[n]) >> 1; - } - if (weightTotal == 0) return ERROR(corruption_detected); - - /* get last non-null symbol weight (implied, total must be 2^n) */ - tableLog = BITv05_highbit32(weightTotal) + 1; - if (tableLog > HUFv05_ABSOLUTEMAX_TABLELOG) return ERROR(corruption_detected); - { /* determine last weight */ - U32 total = 1 << tableLog; - U32 rest = total - weightTotal; - U32 verif = 1 << BITv05_highbit32(rest); - U32 lastWeight = BITv05_highbit32(rest) + 1; - if (verif != rest) return ERROR(corruption_detected); /* last value must be a clean power of 2 */ - huffWeight[oSize] = (BYTE)lastWeight; - rankStats[lastWeight]++; - } - - /* check tree construction validity */ - if ((rankStats[1] < 2) || (rankStats[1] & 1)) return ERROR(corruption_detected); /* by construction : at least 2 elts of rank 1, must be even */ - - /* results */ - *nbSymbolsPtr = (U32)(oSize+1); - *tableLogPtr = tableLog; - return iSize+1; -} - - -/*-***************************/ -/* single-symbol decoding */ -/*-***************************/ - -size_t HUFv05_readDTableX2 (U16* DTable, const void* src, size_t srcSize) -{ - BYTE huffWeight[HUFv05_MAX_SYMBOL_VALUE + 1]; - U32 rankVal[HUFv05_ABSOLUTEMAX_TABLELOG + 1]; /* large enough for values from 0 to 16 */ - U32 tableLog = 0; - size_t iSize; - U32 nbSymbols = 0; - U32 n; - U32 nextRankStart; - void* const dtPtr = DTable + 1; - HUFv05_DEltX2* const dt = (HUFv05_DEltX2*)dtPtr; - - HUFv05_STATIC_ASSERT(sizeof(HUFv05_DEltX2) == sizeof(U16)); /* if compilation fails here, assertion is false */ - //memset(huffWeight, 0, sizeof(huffWeight)); /* is not necessary, even though some analyzer complain ... */ - - iSize = HUFv05_readStats(huffWeight, HUFv05_MAX_SYMBOL_VALUE + 1, rankVal, &nbSymbols, &tableLog, src, srcSize); - if (HUFv05_isError(iSize)) return iSize; - - /* check result */ - if (tableLog > DTable[0]) return ERROR(tableLog_tooLarge); /* DTable is too small */ - DTable[0] = (U16)tableLog; /* maybe should separate sizeof allocated DTable, from used size of DTable, in case of re-use */ - - /* Prepare ranks */ - nextRankStart = 0; - for (n=1; n<=tableLog; n++) { - U32 current = nextRankStart; - nextRankStart += (rankVal[n] << (n-1)); - rankVal[n] = current; - } - - /* fill DTable */ - for (n=0; n<nbSymbols; n++) { - const U32 w = huffWeight[n]; - const U32 length = (1 << w) >> 1; - U32 i; - HUFv05_DEltX2 D; - D.byte = (BYTE)n; D.nbBits = (BYTE)(tableLog + 1 - w); - for (i = rankVal[w]; i < rankVal[w] + length; i++) - dt[i] = D; - rankVal[w] += length; - } - - return iSize; -} - -static BYTE HUFv05_decodeSymbolX2(BITv05_DStream_t* Dstream, const HUFv05_DEltX2* dt, const U32 dtLog) -{ - const size_t val = BITv05_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */ - const BYTE c = dt[val].byte; - BITv05_skipBits(Dstream, dt[val].nbBits); - return c; -} - -#define HUFv05_DECODE_SYMBOLX2_0(ptr, DStreamPtr) \ - *ptr++ = HUFv05_decodeSymbolX2(DStreamPtr, dt, dtLog) - -#define HUFv05_DECODE_SYMBOLX2_1(ptr, DStreamPtr) \ - if (MEM_64bits() || (HUFv05_MAX_TABLELOG<=12)) \ - HUFv05_DECODE_SYMBOLX2_0(ptr, DStreamPtr) - -#define HUFv05_DECODE_SYMBOLX2_2(ptr, DStreamPtr) \ - if (MEM_64bits()) \ - HUFv05_DECODE_SYMBOLX2_0(ptr, DStreamPtr) - -static inline size_t HUFv05_decodeStreamX2(BYTE* p, BITv05_DStream_t* const bitDPtr, BYTE* const pEnd, const HUFv05_DEltX2* const dt, const U32 dtLog) -{ - BYTE* const pStart = p; - - /* up to 4 symbols at a time */ - while ((BITv05_reloadDStream(bitDPtr) == BITv05_DStream_unfinished) && (p <= pEnd-4)) { - HUFv05_DECODE_SYMBOLX2_2(p, bitDPtr); - HUFv05_DECODE_SYMBOLX2_1(p, bitDPtr); - HUFv05_DECODE_SYMBOLX2_2(p, bitDPtr); - HUFv05_DECODE_SYMBOLX2_0(p, bitDPtr); - } - - /* closer to the end */ - while ((BITv05_reloadDStream(bitDPtr) == BITv05_DStream_unfinished) && (p < pEnd)) - HUFv05_DECODE_SYMBOLX2_0(p, bitDPtr); - - /* no more data to retrieve from bitstream, hence no need to reload */ - while (p < pEnd) - HUFv05_DECODE_SYMBOLX2_0(p, bitDPtr); - - return pEnd-pStart; -} - -size_t HUFv05_decompress1X2_usingDTable( - void* dst, size_t dstSize, - const void* cSrc, size_t cSrcSize, - const U16* DTable) -{ - BYTE* op = (BYTE*)dst; - BYTE* const oend = op + dstSize; - const U32 dtLog = DTable[0]; - const void* dtPtr = DTable; - const HUFv05_DEltX2* const dt = ((const HUFv05_DEltX2*)dtPtr)+1; - BITv05_DStream_t bitD; - - if (dstSize <= cSrcSize) return ERROR(dstSize_tooSmall); - { size_t const errorCode = BITv05_initDStream(&bitD, cSrc, cSrcSize); - if (HUFv05_isError(errorCode)) return errorCode; } - - HUFv05_decodeStreamX2(op, &bitD, oend, dt, dtLog); - - /* check */ - if (!BITv05_endOfDStream(&bitD)) return ERROR(corruption_detected); - - return dstSize; -} - -size_t HUFv05_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) -{ - HUFv05_CREATE_STATIC_DTABLEX2(DTable, HUFv05_MAX_TABLELOG); - const BYTE* ip = (const BYTE*) cSrc; - size_t errorCode; - - errorCode = HUFv05_readDTableX2 (DTable, cSrc, cSrcSize); - if (HUFv05_isError(errorCode)) return errorCode; - if (errorCode >= cSrcSize) return ERROR(srcSize_wrong); - ip += errorCode; - cSrcSize -= errorCode; - - return HUFv05_decompress1X2_usingDTable (dst, dstSize, ip, cSrcSize, DTable); -} - - -size_t HUFv05_decompress4X2_usingDTable( - void* dst, size_t dstSize, - const void* cSrc, size_t cSrcSize, - const U16* DTable) -{ - const BYTE* const istart = (const BYTE*) cSrc; - BYTE* const ostart = (BYTE*) dst; - BYTE* const oend = ostart + dstSize; - const void* const dtPtr = DTable; - const HUFv05_DEltX2* const dt = ((const HUFv05_DEltX2*)dtPtr) +1; - const U32 dtLog = DTable[0]; - size_t errorCode; - - /* Init */ - BITv05_DStream_t bitD1; - BITv05_DStream_t bitD2; - BITv05_DStream_t bitD3; - BITv05_DStream_t bitD4; - const size_t length1 = MEM_readLE16(istart); - const size_t length2 = MEM_readLE16(istart+2); - const size_t length3 = MEM_readLE16(istart+4); - size_t length4; - const BYTE* const istart1 = istart + 6; /* jumpTable */ - const BYTE* const istart2 = istart1 + length1; - const BYTE* const istart3 = istart2 + length2; - const BYTE* const istart4 = istart3 + length3; - const size_t segmentSize = (dstSize+3) / 4; - BYTE* const opStart2 = ostart + segmentSize; - BYTE* const opStart3 = opStart2 + segmentSize; - BYTE* const opStart4 = opStart3 + segmentSize; - BYTE* op1 = ostart; - BYTE* op2 = opStart2; - BYTE* op3 = opStart3; - BYTE* op4 = opStart4; - U32 endSignal; - - /* Check */ - if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ - - length4 = cSrcSize - (length1 + length2 + length3 + 6); - if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ - errorCode = BITv05_initDStream(&bitD1, istart1, length1); - if (HUFv05_isError(errorCode)) return errorCode; - errorCode = BITv05_initDStream(&bitD2, istart2, length2); - if (HUFv05_isError(errorCode)) return errorCode; - errorCode = BITv05_initDStream(&bitD3, istart3, length3); - if (HUFv05_isError(errorCode)) return errorCode; - errorCode = BITv05_initDStream(&bitD4, istart4, length4); - if (HUFv05_isError(errorCode)) return errorCode; - - /* 16-32 symbols per loop (4-8 symbols per stream) */ - endSignal = BITv05_reloadDStream(&bitD1) | BITv05_reloadDStream(&bitD2) | BITv05_reloadDStream(&bitD3) | BITv05_reloadDStream(&bitD4); - for ( ; (endSignal==BITv05_DStream_unfinished) && (op4<(oend-7)) ; ) { - HUFv05_DECODE_SYMBOLX2_2(op1, &bitD1); - HUFv05_DECODE_SYMBOLX2_2(op2, &bitD2); - HUFv05_DECODE_SYMBOLX2_2(op3, &bitD3); - HUFv05_DECODE_SYMBOLX2_2(op4, &bitD4); - HUFv05_DECODE_SYMBOLX2_1(op1, &bitD1); - HUFv05_DECODE_SYMBOLX2_1(op2, &bitD2); - HUFv05_DECODE_SYMBOLX2_1(op3, &bitD3); - HUFv05_DECODE_SYMBOLX2_1(op4, &bitD4); - HUFv05_DECODE_SYMBOLX2_2(op1, &bitD1); - HUFv05_DECODE_SYMBOLX2_2(op2, &bitD2); - HUFv05_DECODE_SYMBOLX2_2(op3, &bitD3); - HUFv05_DECODE_SYMBOLX2_2(op4, &bitD4); - HUFv05_DECODE_SYMBOLX2_0(op1, &bitD1); - HUFv05_DECODE_SYMBOLX2_0(op2, &bitD2); - HUFv05_DECODE_SYMBOLX2_0(op3, &bitD3); - HUFv05_DECODE_SYMBOLX2_0(op4, &bitD4); - endSignal = BITv05_reloadDStream(&bitD1) | BITv05_reloadDStream(&bitD2) | BITv05_reloadDStream(&bitD3) | BITv05_reloadDStream(&bitD4); - } - - /* check corruption */ - if (op1 > opStart2) return ERROR(corruption_detected); - if (op2 > opStart3) return ERROR(corruption_detected); - if (op3 > opStart4) return ERROR(corruption_detected); - /* note : op4 supposed already verified within main loop */ - - /* finish bitStreams one by one */ - HUFv05_decodeStreamX2(op1, &bitD1, opStart2, dt, dtLog); - HUFv05_decodeStreamX2(op2, &bitD2, opStart3, dt, dtLog); - HUFv05_decodeStreamX2(op3, &bitD3, opStart4, dt, dtLog); - HUFv05_decodeStreamX2(op4, &bitD4, oend, dt, dtLog); - - /* check */ - endSignal = BITv05_endOfDStream(&bitD1) & BITv05_endOfDStream(&bitD2) & BITv05_endOfDStream(&bitD3) & BITv05_endOfDStream(&bitD4); - if (!endSignal) return ERROR(corruption_detected); - - /* decoded size */ - return dstSize; -} - - -size_t HUFv05_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) -{ - HUFv05_CREATE_STATIC_DTABLEX2(DTable, HUFv05_MAX_TABLELOG); - const BYTE* ip = (const BYTE*) cSrc; - size_t errorCode; - - errorCode = HUFv05_readDTableX2 (DTable, cSrc, cSrcSize); - if (HUFv05_isError(errorCode)) return errorCode; - if (errorCode >= cSrcSize) return ERROR(srcSize_wrong); - ip += errorCode; - cSrcSize -= errorCode; - - return HUFv05_decompress4X2_usingDTable (dst, dstSize, ip, cSrcSize, DTable); -} - - -/* *************************/ -/* double-symbols decoding */ -/* *************************/ - -static void HUFv05_fillDTableX4Level2(HUFv05_DEltX4* DTable, U32 sizeLog, const U32 consumed, - const U32* rankValOrigin, const int minWeight, - const sortedSymbol_t* sortedSymbols, const U32 sortedListSize, - U32 nbBitsBaseline, U16 baseSeq) -{ - HUFv05_DEltX4 DElt; - U32 rankVal[HUFv05_ABSOLUTEMAX_TABLELOG + 1]; - U32 s; - - /* get pre-calculated rankVal */ - memcpy(rankVal, rankValOrigin, sizeof(rankVal)); - - /* fill skipped values */ - if (minWeight>1) { - U32 i, skipSize = rankVal[minWeight]; - MEM_writeLE16(&(DElt.sequence), baseSeq); - DElt.nbBits = (BYTE)(consumed); - DElt.length = 1; - for (i = 0; i < skipSize; i++) - DTable[i] = DElt; - } - - /* fill DTable */ - for (s=0; s<sortedListSize; s++) { /* note : sortedSymbols already skipped */ - const U32 symbol = sortedSymbols[s].symbol; - const U32 weight = sortedSymbols[s].weight; - const U32 nbBits = nbBitsBaseline - weight; - const U32 length = 1 << (sizeLog-nbBits); - const U32 start = rankVal[weight]; - U32 i = start; - const U32 end = start + length; - - MEM_writeLE16(&(DElt.sequence), (U16)(baseSeq + (symbol << 8))); - DElt.nbBits = (BYTE)(nbBits + consumed); - DElt.length = 2; - do { DTable[i++] = DElt; } while (i<end); /* since length >= 1 */ - - rankVal[weight] += length; - } -} - -typedef U32 rankVal_t[HUFv05_ABSOLUTEMAX_TABLELOG][HUFv05_ABSOLUTEMAX_TABLELOG + 1]; - -static void HUFv05_fillDTableX4(HUFv05_DEltX4* DTable, const U32 targetLog, - const sortedSymbol_t* sortedList, const U32 sortedListSize, - const U32* rankStart, rankVal_t rankValOrigin, const U32 maxWeight, - const U32 nbBitsBaseline) -{ - U32 rankVal[HUFv05_ABSOLUTEMAX_TABLELOG + 1]; - const int scaleLog = nbBitsBaseline - targetLog; /* note : targetLog >= srcLog, hence scaleLog <= 1 */ - const U32 minBits = nbBitsBaseline - maxWeight; - U32 s; - - memcpy(rankVal, rankValOrigin, sizeof(rankVal)); - - /* fill DTable */ - for (s=0; s<sortedListSize; s++) { - const U16 symbol = sortedList[s].symbol; - const U32 weight = sortedList[s].weight; - const U32 nbBits = nbBitsBaseline - weight; - const U32 start = rankVal[weight]; - const U32 length = 1 << (targetLog-nbBits); - - if (targetLog-nbBits >= minBits) { /* enough room for a second symbol */ - U32 sortedRank; - int minWeight = nbBits + scaleLog; - if (minWeight < 1) minWeight = 1; - sortedRank = rankStart[minWeight]; - HUFv05_fillDTableX4Level2(DTable+start, targetLog-nbBits, nbBits, - rankValOrigin[nbBits], minWeight, - sortedList+sortedRank, sortedListSize-sortedRank, - nbBitsBaseline, symbol); - } else { - U32 i; - const U32 end = start + length; - HUFv05_DEltX4 DElt; - - MEM_writeLE16(&(DElt.sequence), symbol); - DElt.nbBits = (BYTE)(nbBits); - DElt.length = 1; - for (i = start; i < end; i++) - DTable[i] = DElt; - } - rankVal[weight] += length; - } -} - -size_t HUFv05_readDTableX4 (unsigned* DTable, const void* src, size_t srcSize) -{ - BYTE weightList[HUFv05_MAX_SYMBOL_VALUE + 1]; - sortedSymbol_t sortedSymbol[HUFv05_MAX_SYMBOL_VALUE + 1]; - U32 rankStats[HUFv05_ABSOLUTEMAX_TABLELOG + 1] = { 0 }; - U32 rankStart0[HUFv05_ABSOLUTEMAX_TABLELOG + 2] = { 0 }; - U32* const rankStart = rankStart0+1; - rankVal_t rankVal; - U32 tableLog, maxW, sizeOfSort, nbSymbols; - const U32 memLog = DTable[0]; - size_t iSize; - void* dtPtr = DTable; - HUFv05_DEltX4* const dt = ((HUFv05_DEltX4*)dtPtr) + 1; - - HUFv05_STATIC_ASSERT(sizeof(HUFv05_DEltX4) == sizeof(unsigned)); /* if compilation fails here, assertion is false */ - if (memLog > HUFv05_ABSOLUTEMAX_TABLELOG) return ERROR(tableLog_tooLarge); - //memset(weightList, 0, sizeof(weightList)); /* is not necessary, even though some analyzer complain ... */ - - iSize = HUFv05_readStats(weightList, HUFv05_MAX_SYMBOL_VALUE + 1, rankStats, &nbSymbols, &tableLog, src, srcSize); - if (HUFv05_isError(iSize)) return iSize; - - /* check result */ - if (tableLog > memLog) return ERROR(tableLog_tooLarge); /* DTable can't fit code depth */ - - /* find maxWeight */ - for (maxW = tableLog; rankStats[maxW]==0; maxW--) {} /* necessarily finds a solution before 0 */ - - /* Get start index of each weight */ - { - U32 w, nextRankStart = 0; - for (w=1; w<=maxW; w++) { - U32 current = nextRankStart; - nextRankStart += rankStats[w]; - rankStart[w] = current; - } - rankStart[0] = nextRankStart; /* put all 0w symbols at the end of sorted list*/ - sizeOfSort = nextRankStart; - } - - /* sort symbols by weight */ - { - U32 s; - for (s=0; s<nbSymbols; s++) { - U32 w = weightList[s]; - U32 r = rankStart[w]++; - sortedSymbol[r].symbol = (BYTE)s; - sortedSymbol[r].weight = (BYTE)w; - } - rankStart[0] = 0; /* forget 0w symbols; this is beginning of weight(1) */ - } - - /* Build rankVal */ - { - const U32 minBits = tableLog+1 - maxW; - U32 nextRankVal = 0; - U32 w, consumed; - const int rescale = (memLog-tableLog) - 1; /* tableLog <= memLog */ - U32* rankVal0 = rankVal[0]; - for (w=1; w<=maxW; w++) { - U32 current = nextRankVal; - nextRankVal += rankStats[w] << (w+rescale); - rankVal0[w] = current; - } - for (consumed = minBits; consumed <= memLog - minBits; consumed++) { - U32* rankValPtr = rankVal[consumed]; - for (w = 1; w <= maxW; w++) { - rankValPtr[w] = rankVal0[w] >> consumed; - } } } - - HUFv05_fillDTableX4(dt, memLog, - sortedSymbol, sizeOfSort, - rankStart0, rankVal, maxW, - tableLog+1); - - return iSize; -} - - -static U32 HUFv05_decodeSymbolX4(void* op, BITv05_DStream_t* DStream, const HUFv05_DEltX4* dt, const U32 dtLog) -{ - const size_t val = BITv05_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ - memcpy(op, dt+val, 2); - BITv05_skipBits(DStream, dt[val].nbBits); - return dt[val].length; -} - -static U32 HUFv05_decodeLastSymbolX4(void* op, BITv05_DStream_t* DStream, const HUFv05_DEltX4* dt, const U32 dtLog) -{ - const size_t val = BITv05_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */ - memcpy(op, dt+val, 1); - if (dt[val].length==1) BITv05_skipBits(DStream, dt[val].nbBits); - else { - if (DStream->bitsConsumed < (sizeof(DStream->bitContainer)*8)) { - BITv05_skipBits(DStream, dt[val].nbBits); - if (DStream->bitsConsumed > (sizeof(DStream->bitContainer)*8)) - DStream->bitsConsumed = (sizeof(DStream->bitContainer)*8); /* ugly hack; works only because it's the last symbol. Note : can't easily extract nbBits from just this symbol */ - } } - return 1; -} - - -#define HUFv05_DECODE_SYMBOLX4_0(ptr, DStreamPtr) \ - ptr += HUFv05_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) - -#define HUFv05_DECODE_SYMBOLX4_1(ptr, DStreamPtr) \ - if (MEM_64bits() || (HUFv05_MAX_TABLELOG<=12)) \ - ptr += HUFv05_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) - -#define HUFv05_DECODE_SYMBOLX4_2(ptr, DStreamPtr) \ - if (MEM_64bits()) \ - ptr += HUFv05_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog) - -static inline size_t HUFv05_decodeStreamX4(BYTE* p, BITv05_DStream_t* bitDPtr, BYTE* const pEnd, const HUFv05_DEltX4* const dt, const U32 dtLog) -{ - BYTE* const pStart = p; - - /* up to 8 symbols at a time */ - while ((BITv05_reloadDStream(bitDPtr) == BITv05_DStream_unfinished) && (p < pEnd-7)) { - HUFv05_DECODE_SYMBOLX4_2(p, bitDPtr); - HUFv05_DECODE_SYMBOLX4_1(p, bitDPtr); - HUFv05_DECODE_SYMBOLX4_2(p, bitDPtr); - HUFv05_DECODE_SYMBOLX4_0(p, bitDPtr); - } - - /* closer to the end */ - while ((BITv05_reloadDStream(bitDPtr) == BITv05_DStream_unfinished) && (p <= pEnd-2)) - HUFv05_DECODE_SYMBOLX4_0(p, bitDPtr); - - while (p <= pEnd-2) - HUFv05_DECODE_SYMBOLX4_0(p, bitDPtr); /* no need to reload : reached the end of DStream */ - - if (p < pEnd) - p += HUFv05_decodeLastSymbolX4(p, bitDPtr, dt, dtLog); - - return p-pStart; -} - - -size_t HUFv05_decompress1X4_usingDTable( - void* dst, size_t dstSize, - const void* cSrc, size_t cSrcSize, - const unsigned* DTable) -{ - const BYTE* const istart = (const BYTE*) cSrc; - BYTE* const ostart = (BYTE*) dst; - BYTE* const oend = ostart + dstSize; - - const U32 dtLog = DTable[0]; - const void* const dtPtr = DTable; - const HUFv05_DEltX4* const dt = ((const HUFv05_DEltX4*)dtPtr) +1; - size_t errorCode; - - /* Init */ - BITv05_DStream_t bitD; - errorCode = BITv05_initDStream(&bitD, istart, cSrcSize); - if (HUFv05_isError(errorCode)) return errorCode; - - /* finish bitStreams one by one */ - HUFv05_decodeStreamX4(ostart, &bitD, oend, dt, dtLog); - - /* check */ - if (!BITv05_endOfDStream(&bitD)) return ERROR(corruption_detected); - - /* decoded size */ - return dstSize; -} - -size_t HUFv05_decompress1X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) -{ - HUFv05_CREATE_STATIC_DTABLEX4(DTable, HUFv05_MAX_TABLELOG); - const BYTE* ip = (const BYTE*) cSrc; - - size_t hSize = HUFv05_readDTableX4 (DTable, cSrc, cSrcSize); - if (HUFv05_isError(hSize)) return hSize; - if (hSize >= cSrcSize) return ERROR(srcSize_wrong); - ip += hSize; - cSrcSize -= hSize; - - return HUFv05_decompress1X4_usingDTable (dst, dstSize, ip, cSrcSize, DTable); -} - -size_t HUFv05_decompress4X4_usingDTable( - void* dst, size_t dstSize, - const void* cSrc, size_t cSrcSize, - const unsigned* DTable) -{ - if (cSrcSize < 10) return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */ - - { - const BYTE* const istart = (const BYTE*) cSrc; - BYTE* const ostart = (BYTE*) dst; - BYTE* const oend = ostart + dstSize; - const void* const dtPtr = DTable; - const HUFv05_DEltX4* const dt = ((const HUFv05_DEltX4*)dtPtr) +1; - const U32 dtLog = DTable[0]; - size_t errorCode; - - /* Init */ - BITv05_DStream_t bitD1; - BITv05_DStream_t bitD2; - BITv05_DStream_t bitD3; - BITv05_DStream_t bitD4; - const size_t length1 = MEM_readLE16(istart); - const size_t length2 = MEM_readLE16(istart+2); - const size_t length3 = MEM_readLE16(istart+4); - size_t length4; - const BYTE* const istart1 = istart + 6; /* jumpTable */ - const BYTE* const istart2 = istart1 + length1; - const BYTE* const istart3 = istart2 + length2; - const BYTE* const istart4 = istart3 + length3; - const size_t segmentSize = (dstSize+3) / 4; - BYTE* const opStart2 = ostart + segmentSize; - BYTE* const opStart3 = opStart2 + segmentSize; - BYTE* const opStart4 = opStart3 + segmentSize; - BYTE* op1 = ostart; - BYTE* op2 = opStart2; - BYTE* op3 = opStart3; - BYTE* op4 = opStart4; - U32 endSignal; - - length4 = cSrcSize - (length1 + length2 + length3 + 6); - if (length4 > cSrcSize) return ERROR(corruption_detected); /* overflow */ - errorCode = BITv05_initDStream(&bitD1, istart1, length1); - if (HUFv05_isError(errorCode)) return errorCode; - errorCode = BITv05_initDStream(&bitD2, istart2, length2); - if (HUFv05_isError(errorCode)) return errorCode; - errorCode = BITv05_initDStream(&bitD3, istart3, length3); - if (HUFv05_isError(errorCode)) return errorCode; - errorCode = BITv05_initDStream(&bitD4, istart4, length4); - if (HUFv05_isError(errorCode)) return errorCode; - - /* 16-32 symbols per loop (4-8 symbols per stream) */ - endSignal = BITv05_reloadDStream(&bitD1) | BITv05_reloadDStream(&bitD2) | BITv05_reloadDStream(&bitD3) | BITv05_reloadDStream(&bitD4); - for ( ; (endSignal==BITv05_DStream_unfinished) && (op4<(oend-7)) ; ) { - HUFv05_DECODE_SYMBOLX4_2(op1, &bitD1); - HUFv05_DECODE_SYMBOLX4_2(op2, &bitD2); - HUFv05_DECODE_SYMBOLX4_2(op3, &bitD3); - HUFv05_DECODE_SYMBOLX4_2(op4, &bitD4); - HUFv05_DECODE_SYMBOLX4_1(op1, &bitD1); - HUFv05_DECODE_SYMBOLX4_1(op2, &bitD2); - HUFv05_DECODE_SYMBOLX4_1(op3, &bitD3); - HUFv05_DECODE_SYMBOLX4_1(op4, &bitD4); - HUFv05_DECODE_SYMBOLX4_2(op1, &bitD1); - HUFv05_DECODE_SYMBOLX4_2(op2, &bitD2); - HUFv05_DECODE_SYMBOLX4_2(op3, &bitD3); - HUFv05_DECODE_SYMBOLX4_2(op4, &bitD4); - HUFv05_DECODE_SYMBOLX4_0(op1, &bitD1); - HUFv05_DECODE_SYMBOLX4_0(op2, &bitD2); - HUFv05_DECODE_SYMBOLX4_0(op3, &bitD3); - HUFv05_DECODE_SYMBOLX4_0(op4, &bitD4); - - endSignal = BITv05_reloadDStream(&bitD1) | BITv05_reloadDStream(&bitD2) | BITv05_reloadDStream(&bitD3) | BITv05_reloadDStream(&bitD4); - } - - /* check corruption */ - if (op1 > opStart2) return ERROR(corruption_detected); - if (op2 > opStart3) return ERROR(corruption_detected); - if (op3 > opStart4) return ERROR(corruption_detected); - /* note : op4 supposed already verified within main loop */ - - /* finish bitStreams one by one */ - HUFv05_decodeStreamX4(op1, &bitD1, opStart2, dt, dtLog); - HUFv05_decodeStreamX4(op2, &bitD2, opStart3, dt, dtLog); - HUFv05_decodeStreamX4(op3, &bitD3, opStart4, dt, dtLog); - HUFv05_decodeStreamX4(op4, &bitD4, oend, dt, dtLog); - - /* check */ - endSignal = BITv05_endOfDStream(&bitD1) & BITv05_endOfDStream(&bitD2) & BITv05_endOfDStream(&bitD3) & BITv05_endOfDStream(&bitD4); - if (!endSignal) return ERROR(corruption_detected); - - /* decoded size */ - return dstSize; - } -} - - -size_t HUFv05_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) -{ - HUFv05_CREATE_STATIC_DTABLEX4(DTable, HUFv05_MAX_TABLELOG); - const BYTE* ip = (const BYTE*) cSrc; - - size_t hSize = HUFv05_readDTableX4 (DTable, cSrc, cSrcSize); - if (HUFv05_isError(hSize)) return hSize; - if (hSize >= cSrcSize) return ERROR(srcSize_wrong); - ip += hSize; - cSrcSize -= hSize; - - return HUFv05_decompress4X4_usingDTable (dst, dstSize, ip, cSrcSize, DTable); -} - - -/* ********************************/ -/* Generic decompression selector */ -/* ********************************/ - -typedef struct { U32 tableTime; U32 decode256Time; } algo_time_t; -static const algo_time_t algoTime[16 /* Quantization */][3 /* single, double, quad */] = -{ - /* single, double, quad */ - {{0,0}, {1,1}, {2,2}}, /* Q==0 : impossible */ - {{0,0}, {1,1}, {2,2}}, /* Q==1 : impossible */ - {{ 38,130}, {1313, 74}, {2151, 38}}, /* Q == 2 : 12-18% */ - {{ 448,128}, {1353, 74}, {2238, 41}}, /* Q == 3 : 18-25% */ - {{ 556,128}, {1353, 74}, {2238, 47}}, /* Q == 4 : 25-32% */ - {{ 714,128}, {1418, 74}, {2436, 53}}, /* Q == 5 : 32-38% */ - {{ 883,128}, {1437, 74}, {2464, 61}}, /* Q == 6 : 38-44% */ - {{ 897,128}, {1515, 75}, {2622, 68}}, /* Q == 7 : 44-50% */ - {{ 926,128}, {1613, 75}, {2730, 75}}, /* Q == 8 : 50-56% */ - {{ 947,128}, {1729, 77}, {3359, 77}}, /* Q == 9 : 56-62% */ - {{1107,128}, {2083, 81}, {4006, 84}}, /* Q ==10 : 62-69% */ - {{1177,128}, {2379, 87}, {4785, 88}}, /* Q ==11 : 69-75% */ - {{1242,128}, {2415, 93}, {5155, 84}}, /* Q ==12 : 75-81% */ - {{1349,128}, {2644,106}, {5260,106}}, /* Q ==13 : 81-87% */ - {{1455,128}, {2422,124}, {4174,124}}, /* Q ==14 : 87-93% */ - {{ 722,128}, {1891,145}, {1936,146}}, /* Q ==15 : 93-99% */ -}; - -typedef size_t (*decompressionAlgo)(void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); - -size_t HUFv05_decompress (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize) -{ - static const decompressionAlgo decompress[3] = { HUFv05_decompress4X2, HUFv05_decompress4X4, NULL }; - /* estimate decompression time */ - U32 Q; - const U32 D256 = (U32)(dstSize >> 8); - U32 Dtime[3]; - U32 algoNb = 0; - int n; - - /* validation checks */ - if (dstSize == 0) return ERROR(dstSize_tooSmall); - if (cSrcSize >= dstSize) return ERROR(corruption_detected); /* invalid, or not compressed, but not compressed already dealt with */ - if (cSrcSize == 1) { memset(dst, *(const BYTE*)cSrc, dstSize); return dstSize; } /* RLE */ - - /* decoder timing evaluation */ - Q = (U32)(cSrcSize * 16 / dstSize); /* Q < 16 since dstSize > cSrcSize */ - for (n=0; n<3; n++) - Dtime[n] = algoTime[Q][n].tableTime + (algoTime[Q][n].decode256Time * D256); - - Dtime[1] += Dtime[1] >> 4; Dtime[2] += Dtime[2] >> 3; /* advantage to algorithms using less memory, for cache eviction */ - - if (Dtime[1] < Dtime[0]) algoNb = 1; - - return decompress[algoNb](dst, dstSize, cSrc, cSrcSize); - - //return HUFv05_decompress4X2(dst, dstSize, cSrc, cSrcSize); /* multi-streams single-symbol decoding */ - //return HUFv05_decompress4X4(dst, dstSize, cSrc, cSrcSize); /* multi-streams double-symbols decoding */ - //return HUFv05_decompress4X6(dst, dstSize, cSrc, cSrcSize); /* multi-streams quad-symbols decoding */ -} -/* - zstd - standard compression library - Copyright (C) 2014-2016, Yann Collet. - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - zstd source repository : https://github.com/Cyan4973/zstd -*/ - -/* *************************************************************** -* Tuning parameters -*****************************************************************/ -/*! - * HEAPMODE : - * Select how default decompression function ZSTDv05_decompress() will allocate memory, - * in memory stack (0), or in memory heap (1, requires malloc()) - */ -#ifndef ZSTDv05_HEAPMODE -# define ZSTDv05_HEAPMODE 1 -#endif - - -/*-******************************************************* -* Dependencies -*********************************************************/ -#include <stdlib.h> /* calloc */ -#include <string.h> /* memcpy, memmove */ -#include <stdio.h> /* debug only : printf */ - - -/*-******************************************************* -* Compiler specifics -*********************************************************/ -#ifdef _MSC_VER /* Visual Studio */ -# include <intrin.h> /* For Visual 2005 */ -# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ -# pragma warning(disable : 4324) /* disable: C4324: padded structure */ -#endif - - -/*-************************************* -* Local types -***************************************/ -typedef struct -{ - blockType_t blockType; - U32 origSize; -} blockProperties_t; - - -/* ******************************************************* -* Memory operations -**********************************************************/ -static void ZSTDv05_copy4(void* dst, const void* src) { memcpy(dst, src, 4); } - - -/* ************************************* -* Error Management -***************************************/ -/*! ZSTDv05_isError() : -* tells if a return value is an error code */ -unsigned ZSTDv05_isError(size_t code) { return ERR_isError(code); } - - -/*! ZSTDv05_getErrorName() : -* provides error code string (useful for debugging) */ -const char* ZSTDv05_getErrorName(size_t code) { return ERR_getErrorName(code); } - - -/* ************************************************************* -* Context management -***************************************************************/ -typedef enum { ZSTDv05ds_getFrameHeaderSize, ZSTDv05ds_decodeFrameHeader, - ZSTDv05ds_decodeBlockHeader, ZSTDv05ds_decompressBlock } ZSTDv05_dStage; - -struct ZSTDv05_DCtx_s -{ - FSEv05_DTable LLTable[FSEv05_DTABLE_SIZE_U32(LLFSEv05Log)]; - FSEv05_DTable OffTable[FSEv05_DTABLE_SIZE_U32(OffFSEv05Log)]; - FSEv05_DTable MLTable[FSEv05_DTABLE_SIZE_U32(MLFSEv05Log)]; - unsigned hufTableX4[HUFv05_DTABLE_SIZE(HufLog)]; - const void* previousDstEnd; - const void* base; - const void* vBase; - const void* dictEnd; - size_t expected; - size_t headerSize; - ZSTDv05_parameters params; - blockType_t bType; /* used in ZSTDv05_decompressContinue(), to transfer blockType between header decoding and block decoding stages */ - ZSTDv05_dStage stage; - U32 flagStaticTables; - const BYTE* litPtr; - size_t litSize; - BYTE litBuffer[BLOCKSIZE + WILDCOPY_OVERLENGTH]; - BYTE headerBuffer[ZSTDv05_frameHeaderSize_max]; -}; /* typedef'd to ZSTDv05_DCtx within "zstd_static.h" */ - -size_t ZSTDv05_sizeofDCtx (void); /* Hidden declaration */ -size_t ZSTDv05_sizeofDCtx (void) { return sizeof(ZSTDv05_DCtx); } - -size_t ZSTDv05_decompressBegin(ZSTDv05_DCtx* dctx) -{ - dctx->expected = ZSTDv05_frameHeaderSize_min; - dctx->stage = ZSTDv05ds_getFrameHeaderSize; - dctx->previousDstEnd = NULL; - dctx->base = NULL; - dctx->vBase = NULL; - dctx->dictEnd = NULL; - dctx->hufTableX4[0] = HufLog; - dctx->flagStaticTables = 0; - return 0; -} - -ZSTDv05_DCtx* ZSTDv05_createDCtx(void) -{ - ZSTDv05_DCtx* dctx = (ZSTDv05_DCtx*)malloc(sizeof(ZSTDv05_DCtx)); - if (dctx==NULL) return NULL; - ZSTDv05_decompressBegin(dctx); - return dctx; -} - -size_t ZSTDv05_freeDCtx(ZSTDv05_DCtx* dctx) -{ - free(dctx); - return 0; /* reserved as a potential error code in the future */ -} - -void ZSTDv05_copyDCtx(ZSTDv05_DCtx* dstDCtx, const ZSTDv05_DCtx* srcDCtx) -{ - memcpy(dstDCtx, srcDCtx, - sizeof(ZSTDv05_DCtx) - (BLOCKSIZE+WILDCOPY_OVERLENGTH + ZSTDv05_frameHeaderSize_max)); /* no need to copy workspace */ -} - - -/* ************************************************************* -* Decompression section -***************************************************************/ - -/* Frame format description - Frame Header - [ Block Header - Block ] - Frame End - 1) Frame Header - - 4 bytes - Magic Number : ZSTDv05_MAGICNUMBER (defined within zstd_internal.h) - - 1 byte - Window Descriptor - 2) Block Header - - 3 bytes, starting with a 2-bits descriptor - Uncompressed, Compressed, Frame End, unused - 3) Block - See Block Format Description - 4) Frame End - - 3 bytes, compatible with Block Header -*/ - -/* Block format description - - Block = Literal Section - Sequences Section - Prerequisite : size of (compressed) block, maximum size of regenerated data - - 1) Literal Section - - 1.1) Header : 1-5 bytes - flags: 2 bits - 00 compressed by Huff0 - 01 unused - 10 is Raw (uncompressed) - 11 is Rle - Note : using 01 => Huff0 with precomputed table ? - Note : delta map ? => compressed ? - - 1.1.1) Huff0-compressed literal block : 3-5 bytes - srcSize < 1 KB => 3 bytes (2-2-10-10) => single stream - srcSize < 1 KB => 3 bytes (2-2-10-10) - srcSize < 16KB => 4 bytes (2-2-14-14) - else => 5 bytes (2-2-18-18) - big endian convention - - 1.1.2) Raw (uncompressed) literal block header : 1-3 bytes - size : 5 bits: (IS_RAW<<6) + (0<<4) + size - 12 bits: (IS_RAW<<6) + (2<<4) + (size>>8) - size&255 - 20 bits: (IS_RAW<<6) + (3<<4) + (size>>16) - size>>8&255 - size&255 - - 1.1.3) Rle (repeated single byte) literal block header : 1-3 bytes - size : 5 bits: (IS_RLE<<6) + (0<<4) + size - 12 bits: (IS_RLE<<6) + (2<<4) + (size>>8) - size&255 - 20 bits: (IS_RLE<<6) + (3<<4) + (size>>16) - size>>8&255 - size&255 - - 1.1.4) Huff0-compressed literal block, using precomputed CTables : 3-5 bytes - srcSize < 1 KB => 3 bytes (2-2-10-10) => single stream - srcSize < 1 KB => 3 bytes (2-2-10-10) - srcSize < 16KB => 4 bytes (2-2-14-14) - else => 5 bytes (2-2-18-18) - big endian convention - - 1- CTable available (stored into workspace ?) - 2- Small input (fast heuristic ? Full comparison ? depend on clevel ?) - - - 1.2) Literal block content - - 1.2.1) Huff0 block, using sizes from header - See Huff0 format - - 1.2.2) Huff0 block, using prepared table - - 1.2.3) Raw content - - 1.2.4) single byte - - - 2) Sequences section - TO DO -*/ - - -/** ZSTDv05_decodeFrameHeader_Part1() : -* decode the 1st part of the Frame Header, which tells Frame Header size. -* srcSize must be == ZSTDv05_frameHeaderSize_min. -* @return : the full size of the Frame Header */ -static size_t ZSTDv05_decodeFrameHeader_Part1(ZSTDv05_DCtx* zc, const void* src, size_t srcSize) -{ - U32 magicNumber; - if (srcSize != ZSTDv05_frameHeaderSize_min) - return ERROR(srcSize_wrong); - magicNumber = MEM_readLE32(src); - if (magicNumber != ZSTDv05_MAGICNUMBER) return ERROR(prefix_unknown); - zc->headerSize = ZSTDv05_frameHeaderSize_min; - return zc->headerSize; -} - - -size_t ZSTDv05_getFrameParams(ZSTDv05_parameters* params, const void* src, size_t srcSize) -{ - U32 magicNumber; - if (srcSize < ZSTDv05_frameHeaderSize_min) return ZSTDv05_frameHeaderSize_max; - magicNumber = MEM_readLE32(src); - if (magicNumber != ZSTDv05_MAGICNUMBER) return ERROR(prefix_unknown); - memset(params, 0, sizeof(*params)); - params->windowLog = (((const BYTE*)src)[4] & 15) + ZSTDv05_WINDOWLOG_ABSOLUTEMIN; - if ((((const BYTE*)src)[4] >> 4) != 0) return ERROR(frameParameter_unsupported); /* reserved bits */ - return 0; -} - -/** ZSTDv05_decodeFrameHeader_Part2() : -* decode the full Frame Header. -* srcSize must be the size provided by ZSTDv05_decodeFrameHeader_Part1(). -* @return : 0, or an error code, which can be tested using ZSTDv05_isError() */ -static size_t ZSTDv05_decodeFrameHeader_Part2(ZSTDv05_DCtx* zc, const void* src, size_t srcSize) -{ - size_t result; - if (srcSize != zc->headerSize) - return ERROR(srcSize_wrong); - result = ZSTDv05_getFrameParams(&(zc->params), src, srcSize); - if ((MEM_32bits()) && (zc->params.windowLog > 25)) return ERROR(frameParameter_unsupported); - return result; -} - - -static size_t ZSTDv05_getcBlockSize(const void* src, size_t srcSize, blockProperties_t* bpPtr) -{ - const BYTE* const in = (const BYTE* const)src; - BYTE headerFlags; - U32 cSize; - - if (srcSize < 3) - return ERROR(srcSize_wrong); - - headerFlags = *in; - cSize = in[2] + (in[1]<<8) + ((in[0] & 7)<<16); - - bpPtr->blockType = (blockType_t)(headerFlags >> 6); - bpPtr->origSize = (bpPtr->blockType == bt_rle) ? cSize : 0; - - if (bpPtr->blockType == bt_end) return 0; - if (bpPtr->blockType == bt_rle) return 1; - return cSize; -} - - -static size_t ZSTDv05_copyRawBlock(void* dst, size_t maxDstSize, const void* src, size_t srcSize) -{ - if (dst==NULL) return ERROR(dstSize_tooSmall); - if (srcSize > maxDstSize) return ERROR(dstSize_tooSmall); - memcpy(dst, src, srcSize); - return srcSize; -} - - -/*! ZSTDv05_decodeLiteralsBlock() : - @return : nb of bytes read from src (< srcSize ) */ -static size_t ZSTDv05_decodeLiteralsBlock(ZSTDv05_DCtx* dctx, - const void* src, size_t srcSize) /* note : srcSize < BLOCKSIZE */ -{ - const BYTE* const istart = (const BYTE*) src; - - /* any compressed block with literals segment must be at least this size */ - if (srcSize < MIN_CBLOCK_SIZE) return ERROR(corruption_detected); - - switch(istart[0]>> 6) - { - case IS_HUFv05: - { - size_t litSize, litCSize, singleStream=0; - U32 lhSize = ((istart[0]) >> 4) & 3; - if (srcSize < 5) return ERROR(corruption_detected); /* srcSize >= MIN_CBLOCK_SIZE == 3; here we need up to 5 for case 3 */ - switch(lhSize) - { - case 0: case 1: default: /* note : default is impossible, since lhSize into [0..3] */ - /* 2 - 2 - 10 - 10 */ - lhSize=3; - singleStream = istart[0] & 16; - litSize = ((istart[0] & 15) << 6) + (istart[1] >> 2); - litCSize = ((istart[1] & 3) << 8) + istart[2]; - break; - case 2: - /* 2 - 2 - 14 - 14 */ - lhSize=4; - litSize = ((istart[0] & 15) << 10) + (istart[1] << 2) + (istart[2] >> 6); - litCSize = ((istart[2] & 63) << 8) + istart[3]; - break; - case 3: - /* 2 - 2 - 18 - 18 */ - lhSize=5; - litSize = ((istart[0] & 15) << 14) + (istart[1] << 6) + (istart[2] >> 2); - litCSize = ((istart[2] & 3) << 16) + (istart[3] << 8) + istart[4]; - break; - } - if (litSize > BLOCKSIZE) return ERROR(corruption_detected); - if (litCSize + lhSize > srcSize) return ERROR(corruption_detected); - - if (HUFv05_isError(singleStream ? - HUFv05_decompress1X2(dctx->litBuffer, litSize, istart+lhSize, litCSize) : - HUFv05_decompress (dctx->litBuffer, litSize, istart+lhSize, litCSize) )) - return ERROR(corruption_detected); - - dctx->litPtr = dctx->litBuffer; - dctx->litSize = litSize; - memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH); - return litCSize + lhSize; - } - case IS_PCH: - { - size_t errorCode; - size_t litSize, litCSize; - U32 lhSize = ((istart[0]) >> 4) & 3; - if (lhSize != 1) /* only case supported for now : small litSize, single stream */ - return ERROR(corruption_detected); - if (!dctx->flagStaticTables) - return ERROR(dictionary_corrupted); - - /* 2 - 2 - 10 - 10 */ - lhSize=3; - litSize = ((istart[0] & 15) << 6) + (istart[1] >> 2); - litCSize = ((istart[1] & 3) << 8) + istart[2]; - if (litCSize + lhSize > srcSize) return ERROR(corruption_detected); - - errorCode = HUFv05_decompress1X4_usingDTable(dctx->litBuffer, litSize, istart+lhSize, litCSize, dctx->hufTableX4); - if (HUFv05_isError(errorCode)) return ERROR(corruption_detected); - - dctx->litPtr = dctx->litBuffer; - dctx->litSize = litSize; - memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH); - return litCSize + lhSize; - } - case IS_RAW: - { - size_t litSize; - U32 lhSize = ((istart[0]) >> 4) & 3; - switch(lhSize) - { - case 0: case 1: default: /* note : default is impossible, since lhSize into [0..3] */ - lhSize=1; - litSize = istart[0] & 31; - break; - case 2: - litSize = ((istart[0] & 15) << 8) + istart[1]; - break; - case 3: - litSize = ((istart[0] & 15) << 16) + (istart[1] << 8) + istart[2]; - 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 IS_RLE: - { - size_t litSize; - U32 lhSize = ((istart[0]) >> 4) & 3; - switch(lhSize) - { - case 0: case 1: default: /* note : default is impossible, since lhSize into [0..3] */ - lhSize = 1; - litSize = istart[0] & 31; - break; - case 2: - litSize = ((istart[0] & 15) << 8) + istart[1]; - break; - case 3: - litSize = ((istart[0] & 15) << 16) + (istart[1] << 8) + istart[2]; - if (srcSize<4) return ERROR(corruption_detected); /* srcSize >= MIN_CBLOCK_SIZE == 3; here we need lhSize+1 = 4 */ - break; - } - if (litSize > BLOCKSIZE) 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 */ - } -} - - -static size_t ZSTDv05_decodeSeqHeaders(int* nbSeq, const BYTE** dumpsPtr, size_t* dumpsLengthPtr, - FSEv05_DTable* DTableLL, FSEv05_DTable* DTableML, FSEv05_DTable* DTableOffb, - const void* src, size_t srcSize, U32 flagStaticTable) -{ - const BYTE* const istart = (const BYTE* const)src; - const BYTE* ip = istart; - const BYTE* const iend = istart + srcSize; - U32 LLtype, Offtype, MLtype; - unsigned LLlog, Offlog, MLlog; - size_t dumpsLength; - - /* check */ - if (srcSize < MIN_SEQUENCES_SIZE) - return ERROR(srcSize_wrong); - - /* SeqHead */ - *nbSeq = *ip++; - if (*nbSeq==0) return 1; - if (*nbSeq >= 128) { - if (ip >= iend) return ERROR(srcSize_wrong); - *nbSeq = ((nbSeq[0]-128)<<8) + *ip++; - } - - if (ip >= iend) return ERROR(srcSize_wrong); - LLtype = *ip >> 6; - Offtype = (*ip >> 4) & 3; - MLtype = (*ip >> 2) & 3; - if (*ip & 2) { - if (ip+3 > iend) return ERROR(srcSize_wrong); - dumpsLength = ip[2]; - dumpsLength += ip[1] << 8; - ip += 3; - } else { - if (ip+2 > iend) return ERROR(srcSize_wrong); - dumpsLength = ip[1]; - dumpsLength += (ip[0] & 1) << 8; - ip += 2; - } - *dumpsPtr = ip; - ip += dumpsLength; - *dumpsLengthPtr = dumpsLength; - - /* check */ - if (ip > iend-3) return ERROR(srcSize_wrong); /* min : all 3 are "raw", hence no header, but at least xxLog bits per type */ - - /* sequences */ - { - S16 norm[MaxML+1]; /* assumption : MaxML >= MaxLL >= MaxOff */ - size_t headerSize; - - /* Build DTables */ - switch(LLtype) - { - case FSEv05_ENCODING_RLE : - LLlog = 0; - FSEv05_buildDTable_rle(DTableLL, *ip++); - break; - case FSEv05_ENCODING_RAW : - LLlog = LLbits; - FSEv05_buildDTable_raw(DTableLL, LLbits); - break; - case FSEv05_ENCODING_STATIC: - if (!flagStaticTable) return ERROR(corruption_detected); - break; - case FSEv05_ENCODING_DYNAMIC : - default : /* impossible */ - { unsigned max = MaxLL; - headerSize = FSEv05_readNCount(norm, &max, &LLlog, ip, iend-ip); - if (FSEv05_isError(headerSize)) return ERROR(GENERIC); - if (LLlog > LLFSEv05Log) return ERROR(corruption_detected); - ip += headerSize; - FSEv05_buildDTable(DTableLL, norm, max, LLlog); - } } - - switch(Offtype) - { - case FSEv05_ENCODING_RLE : - Offlog = 0; - if (ip > iend-2) return ERROR(srcSize_wrong); /* min : "raw", hence no header, but at least xxLog bits */ - FSEv05_buildDTable_rle(DTableOffb, *ip++ & MaxOff); /* if *ip > MaxOff, data is corrupted */ - break; - case FSEv05_ENCODING_RAW : - Offlog = Offbits; - FSEv05_buildDTable_raw(DTableOffb, Offbits); - break; - case FSEv05_ENCODING_STATIC: - if (!flagStaticTable) return ERROR(corruption_detected); - break; - case FSEv05_ENCODING_DYNAMIC : - default : /* impossible */ - { unsigned max = MaxOff; - headerSize = FSEv05_readNCount(norm, &max, &Offlog, ip, iend-ip); - if (FSEv05_isError(headerSize)) return ERROR(GENERIC); - if (Offlog > OffFSEv05Log) return ERROR(corruption_detected); - ip += headerSize; - FSEv05_buildDTable(DTableOffb, norm, max, Offlog); - } } - - switch(MLtype) - { - case FSEv05_ENCODING_RLE : - MLlog = 0; - if (ip > iend-2) return ERROR(srcSize_wrong); /* min : "raw", hence no header, but at least xxLog bits */ - FSEv05_buildDTable_rle(DTableML, *ip++); - break; - case FSEv05_ENCODING_RAW : - MLlog = MLbits; - FSEv05_buildDTable_raw(DTableML, MLbits); - break; - case FSEv05_ENCODING_STATIC: - if (!flagStaticTable) return ERROR(corruption_detected); - break; - case FSEv05_ENCODING_DYNAMIC : - default : /* impossible */ - { unsigned max = MaxML; - headerSize = FSEv05_readNCount(norm, &max, &MLlog, ip, iend-ip); - if (FSEv05_isError(headerSize)) return ERROR(GENERIC); - if (MLlog > MLFSEv05Log) return ERROR(corruption_detected); - ip += headerSize; - FSEv05_buildDTable(DTableML, norm, max, MLlog); - } } } - - return ip-istart; -} - - -typedef struct { - size_t litLength; - size_t matchLength; - size_t offset; -} seq_t; - -typedef struct { - BITv05_DStream_t DStream; - FSEv05_DState_t stateLL; - FSEv05_DState_t stateOffb; - FSEv05_DState_t stateML; - size_t prevOffset; - const BYTE* dumps; - const BYTE* dumpsEnd; -} seqState_t; - - - -static void ZSTDv05_decodeSequence(seq_t* seq, seqState_t* seqState) -{ - size_t litLength; - size_t prevOffset; - size_t offset; - size_t matchLength; - const BYTE* dumps = seqState->dumps; - const BYTE* const de = seqState->dumpsEnd; - - /* Literal length */ - litLength = FSEv05_peakSymbol(&(seqState->stateLL)); - prevOffset = litLength ? seq->offset : seqState->prevOffset; - if (litLength == MaxLL) { - U32 add = *dumps++; - if (add < 255) litLength += add; - else { - litLength = MEM_readLE32(dumps) & 0xFFFFFF; /* no risk : dumps is always followed by seq tables > 1 byte */ - if (litLength&1) litLength>>=1, dumps += 3; - else litLength = (U16)(litLength)>>1, dumps += 2; - } - if (dumps > de) { litLength = MaxLL+255; } /* late correction, to avoid using uninitialized memory */ - if (dumps >= de) { dumps = de-1; } /* late correction, to avoid read overflow (data is now corrupted anyway) */ - } - - /* Offset */ - { - static const U32 offsetPrefix[MaxOff+1] = { - 1 /*fake*/, 1, 2, 4, 8, 16, 32, 64, 128, 256, - 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, - 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, /*fake*/ 1, 1, 1, 1, 1 }; - U32 offsetCode = FSEv05_peakSymbol(&(seqState->stateOffb)); /* <= maxOff, by table construction */ - U32 nbBits = offsetCode - 1; - if (offsetCode==0) nbBits = 0; /* cmove */ - offset = offsetPrefix[offsetCode] + BITv05_readBits(&(seqState->DStream), nbBits); - if (MEM_32bits()) BITv05_reloadDStream(&(seqState->DStream)); - if (offsetCode==0) offset = prevOffset; /* repcode, cmove */ - if (offsetCode | !litLength) seqState->prevOffset = seq->offset; /* cmove */ - FSEv05_decodeSymbol(&(seqState->stateOffb), &(seqState->DStream)); /* update */ - } - - /* Literal length update */ - FSEv05_decodeSymbol(&(seqState->stateLL), &(seqState->DStream)); /* update */ - if (MEM_32bits()) BITv05_reloadDStream(&(seqState->DStream)); - - /* MatchLength */ - matchLength = FSEv05_decodeSymbol(&(seqState->stateML), &(seqState->DStream)); - if (matchLength == MaxML) { - U32 add = *dumps++; - if (add < 255) matchLength += add; - else { - matchLength = MEM_readLE32(dumps) & 0xFFFFFF; /* no pb : dumps is always followed by seq tables > 1 byte */ - if (matchLength&1) matchLength>>=1, dumps += 3; - else matchLength = (U16)(matchLength)>>1, dumps += 2; - } - if (dumps > de) { matchLength = MaxML+255; } /* late correction, to avoid using uninitialized memory */ - if (dumps >= de) { dumps = de-1; } /* late correction, to avoid read overflow (data is now corrupted anyway) */ - } - matchLength += MINMATCH; - - /* save result */ - seq->litLength = litLength; - seq->offset = offset; - seq->matchLength = matchLength; - seqState->dumps = dumps; - -#if 0 /* debug */ - { - static U64 totalDecoded = 0; - printf("pos %6u : %3u literals & match %3u bytes at distance %6u \n", - (U32)(totalDecoded), (U32)litLength, (U32)matchLength, (U32)offset); - totalDecoded += litLength + matchLength; - } -#endif -} - - -static size_t ZSTDv05_execSequence(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) -{ - static const int dec32table[] = { 0, 1, 2, 1, 4, 4, 4, 4 }; /* added */ - static const int dec64table[] = { 8, 8, 8, 7, 8, 9,10,11 }; /* subtracted */ - BYTE* const oLitEnd = op + sequence.litLength; - const size_t sequenceLength = sequence.litLength + sequence.matchLength; - BYTE* const oMatchEnd = op + sequenceLength; /* risk : address space overflow (32-bits) */ - BYTE* const oend_8 = oend-8; - const BYTE* const litEnd = *litPtr + sequence.litLength; - const BYTE* match = oLitEnd - sequence.offset; - - /* check */ - if (oLitEnd > oend_8) return ERROR(dstSize_tooSmall); /* last match must start at a minimum distance of 8 from oend */ - if (oMatchEnd > oend) return ERROR(dstSize_tooSmall); /* overwrite beyond dst buffer */ - if (litEnd > litLimit) return ERROR(corruption_detected); /* risk read beyond lit buffer */ - - /* copy Literals */ - ZSTDv05_wildcopy(op, *litPtr, sequence.litLength); /* note : oLitEnd <= oend-8 : no risk of overwrite beyond oend */ - op = oLitEnd; - *litPtr = litEnd; /* update for next sequence */ - - /* 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 length1 = dictEnd - match; - memmove(oLitEnd, match, length1); - op = oLitEnd + length1; - sequence.matchLength -= length1; - match = base; - if (op > oend_8 || sequence.matchLength < MINMATCH) { - while (op < oMatchEnd) *op++ = *match++; - return sequenceLength; - } - } } - /* Requirement: op <= oend_8 */ - - /* match within prefix */ - if (sequence.offset < 8) { - /* close range match, overlap */ - const int sub2 = dec64table[sequence.offset]; - op[0] = match[0]; - op[1] = match[1]; - op[2] = match[2]; - op[3] = match[3]; - match += dec32table[sequence.offset]; - ZSTDv05_copy4(op+4, match); - match -= sub2; - } else { - ZSTDv05_copy8(op, match); - } - op += 8; match += 8; - - if (oMatchEnd > oend-(16-MINMATCH)) { - if (op < oend_8) { - ZSTDv05_wildcopy(op, match, oend_8 - op); - match += oend_8 - op; - op = oend_8; - } - while (op < oMatchEnd) - *op++ = *match++; - } else { - ZSTDv05_wildcopy(op, match, (ptrdiff_t)sequence.matchLength-8); /* works even if matchLength < 8 */ - } - return sequenceLength; -} - - -static size_t ZSTDv05_decompressSequences( - ZSTDv05_DCtx* dctx, - void* dst, size_t maxDstSize, - const void* seqStart, size_t seqSize) -{ - const BYTE* ip = (const BYTE*)seqStart; - const BYTE* const iend = ip + seqSize; - BYTE* const ostart = (BYTE* const)dst; - BYTE* op = ostart; - BYTE* const oend = ostart + maxDstSize; - size_t errorCode, dumpsLength=0; - const BYTE* litPtr = dctx->litPtr; - const BYTE* const litEnd = litPtr + dctx->litSize; - int nbSeq=0; - const BYTE* dumps = NULL; - unsigned* DTableLL = dctx->LLTable; - unsigned* DTableML = dctx->MLTable; - unsigned* DTableOffb = dctx->OffTable; - const BYTE* const base = (const BYTE*) (dctx->base); - const BYTE* const vBase = (const BYTE*) (dctx->vBase); - const BYTE* const dictEnd = (const BYTE*) (dctx->dictEnd); - - /* Build Decoding Tables */ - errorCode = ZSTDv05_decodeSeqHeaders(&nbSeq, &dumps, &dumpsLength, - DTableLL, DTableML, DTableOffb, - ip, seqSize, dctx->flagStaticTables); - if (ZSTDv05_isError(errorCode)) return errorCode; - ip += errorCode; - - /* Regen sequences */ - if (nbSeq) { - seq_t sequence; - seqState_t seqState; - - memset(&sequence, 0, sizeof(sequence)); - sequence.offset = REPCODE_STARTVALUE; - seqState.dumps = dumps; - seqState.dumpsEnd = dumps + dumpsLength; - seqState.prevOffset = REPCODE_STARTVALUE; - errorCode = BITv05_initDStream(&(seqState.DStream), ip, iend-ip); - if (ERR_isError(errorCode)) return ERROR(corruption_detected); - FSEv05_initDState(&(seqState.stateLL), &(seqState.DStream), DTableLL); - FSEv05_initDState(&(seqState.stateOffb), &(seqState.DStream), DTableOffb); - FSEv05_initDState(&(seqState.stateML), &(seqState.DStream), DTableML); - - for ( ; (BITv05_reloadDStream(&(seqState.DStream)) <= BITv05_DStream_completed) && nbSeq ; ) { - size_t oneSeqSize; - nbSeq--; - ZSTDv05_decodeSequence(&sequence, &seqState); - oneSeqSize = ZSTDv05_execSequence(op, oend, sequence, &litPtr, litEnd, base, vBase, dictEnd); - if (ZSTDv05_isError(oneSeqSize)) return oneSeqSize; - op += oneSeqSize; - } - - /* check if reached exact end */ - if (nbSeq) return ERROR(corruption_detected); - } - - /* last literal segment */ - { - size_t lastLLSize = litEnd - litPtr; - if (litPtr > litEnd) return ERROR(corruption_detected); /* too many literals already used */ - if (op+lastLLSize > oend) return ERROR(dstSize_tooSmall); - memcpy(op, litPtr, lastLLSize); - op += lastLLSize; - } - - return op-ostart; -} - - -static void ZSTDv05_checkContinuity(ZSTDv05_DCtx* dctx, const void* dst) -{ - if (dst != dctx->previousDstEnd) { /* not contiguous */ - dctx->dictEnd = dctx->previousDstEnd; - dctx->vBase = (const char*)dst - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->base)); - dctx->base = dst; - dctx->previousDstEnd = dst; - } -} - - -static size_t ZSTDv05_decompressBlock_internal(ZSTDv05_DCtx* dctx, - void* dst, size_t dstCapacity, - const void* src, size_t srcSize) -{ /* blockType == blockCompressed */ - const BYTE* ip = (const BYTE*)src; - size_t litCSize; - - if (srcSize >= BLOCKSIZE) return ERROR(srcSize_wrong); - - /* Decode literals sub-block */ - litCSize = ZSTDv05_decodeLiteralsBlock(dctx, src, srcSize); - if (ZSTDv05_isError(litCSize)) return litCSize; - ip += litCSize; - srcSize -= litCSize; - - return ZSTDv05_decompressSequences(dctx, dst, dstCapacity, ip, srcSize); -} - - -size_t ZSTDv05_decompressBlock(ZSTDv05_DCtx* dctx, - void* dst, size_t dstCapacity, - const void* src, size_t srcSize) -{ - ZSTDv05_checkContinuity(dctx, dst); - return ZSTDv05_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize); -} - - -/*! ZSTDv05_decompress_continueDCtx -* dctx must have been properly initialized */ -static size_t ZSTDv05_decompress_continueDCtx(ZSTDv05_DCtx* dctx, - void* dst, size_t maxDstSize, - const void* src, size_t srcSize) -{ - const BYTE* ip = (const BYTE*)src; - const BYTE* iend = ip + srcSize; - BYTE* const ostart = (BYTE* const)dst; - BYTE* op = ostart; - BYTE* const oend = ostart + maxDstSize; - size_t remainingSize = srcSize; - blockProperties_t blockProperties; - memset(&blockProperties, 0, sizeof(blockProperties)); - - /* Frame Header */ - { size_t frameHeaderSize; - if (srcSize < ZSTDv05_frameHeaderSize_min+ZSTDv05_blockHeaderSize) return ERROR(srcSize_wrong); - frameHeaderSize = ZSTDv05_decodeFrameHeader_Part1(dctx, src, ZSTDv05_frameHeaderSize_min); - if (ZSTDv05_isError(frameHeaderSize)) return frameHeaderSize; - if (srcSize < frameHeaderSize+ZSTDv05_blockHeaderSize) return ERROR(srcSize_wrong); - ip += frameHeaderSize; remainingSize -= frameHeaderSize; - frameHeaderSize = ZSTDv05_decodeFrameHeader_Part2(dctx, src, frameHeaderSize); - if (ZSTDv05_isError(frameHeaderSize)) return frameHeaderSize; - } - - /* Loop on each block */ - while (1) - { - size_t decodedSize=0; - size_t cBlockSize = ZSTDv05_getcBlockSize(ip, iend-ip, &blockProperties); - if (ZSTDv05_isError(cBlockSize)) return cBlockSize; - - ip += ZSTDv05_blockHeaderSize; - remainingSize -= ZSTDv05_blockHeaderSize; - if (cBlockSize > remainingSize) return ERROR(srcSize_wrong); - - switch(blockProperties.blockType) - { - case bt_compressed: - decodedSize = ZSTDv05_decompressBlock_internal(dctx, op, oend-op, ip, cBlockSize); - break; - case bt_raw : - decodedSize = ZSTDv05_copyRawBlock(op, oend-op, ip, cBlockSize); - break; - case bt_rle : - return ERROR(GENERIC); /* not yet supported */ - break; - case bt_end : - /* end of frame */ - if (remainingSize) return ERROR(srcSize_wrong); - break; - default: - return ERROR(GENERIC); /* impossible */ - } - if (cBlockSize == 0) break; /* bt_end */ - - if (ZSTDv05_isError(decodedSize)) return decodedSize; - op += decodedSize; - ip += cBlockSize; - remainingSize -= cBlockSize; - } - - return op-ostart; -} - - -size_t ZSTDv05_decompress_usingPreparedDCtx(ZSTDv05_DCtx* dctx, const ZSTDv05_DCtx* refDCtx, - void* dst, size_t maxDstSize, - const void* src, size_t srcSize) -{ - ZSTDv05_copyDCtx(dctx, refDCtx); - ZSTDv05_checkContinuity(dctx, dst); - return ZSTDv05_decompress_continueDCtx(dctx, dst, maxDstSize, src, srcSize); -} - - -size_t ZSTDv05_decompress_usingDict(ZSTDv05_DCtx* dctx, - void* dst, size_t maxDstSize, - const void* src, size_t srcSize, - const void* dict, size_t dictSize) -{ - ZSTDv05_decompressBegin_usingDict(dctx, dict, dictSize); - ZSTDv05_checkContinuity(dctx, dst); - return ZSTDv05_decompress_continueDCtx(dctx, dst, maxDstSize, src, srcSize); -} - - -size_t ZSTDv05_decompressDCtx(ZSTDv05_DCtx* dctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize) -{ - return ZSTDv05_decompress_usingDict(dctx, dst, maxDstSize, src, srcSize, NULL, 0); -} - -size_t ZSTDv05_decompress(void* dst, size_t maxDstSize, const void* src, size_t srcSize) -{ -#if defined(ZSTDv05_HEAPMODE) && (ZSTDv05_HEAPMODE==1) - size_t regenSize; - ZSTDv05_DCtx* dctx = ZSTDv05_createDCtx(); - if (dctx==NULL) return ERROR(memory_allocation); - regenSize = ZSTDv05_decompressDCtx(dctx, dst, maxDstSize, src, srcSize); - ZSTDv05_freeDCtx(dctx); - return regenSize; -#else - ZSTDv05_DCtx dctx; - return ZSTDv05_decompressDCtx(&dctx, dst, maxDstSize, src, srcSize); -#endif -} - -/* ZSTD_errorFrameSizeInfoLegacy() : - assumes `cSize` and `dBound` are _not_ NULL */ -static void ZSTD_errorFrameSizeInfoLegacy(size_t* cSize, unsigned long long* dBound, size_t ret) -{ - *cSize = ret; - *dBound = ZSTD_CONTENTSIZE_ERROR; -} - -void ZSTDv05_findFrameSizeInfoLegacy(const void *src, size_t srcSize, size_t* cSize, unsigned long long* dBound) -{ - const BYTE* ip = (const BYTE*)src; - size_t remainingSize = srcSize; - size_t nbBlocks = 0; - blockProperties_t blockProperties; - - /* Frame Header */ - if (srcSize < ZSTDv05_frameHeaderSize_min) { - ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, ERROR(srcSize_wrong)); - return; - } - if (MEM_readLE32(src) != ZSTDv05_MAGICNUMBER) { - ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, ERROR(prefix_unknown)); - return; - } - ip += ZSTDv05_frameHeaderSize_min; remainingSize -= ZSTDv05_frameHeaderSize_min; - - /* Loop on each block */ - while (1) - { - size_t cBlockSize = ZSTDv05_getcBlockSize(ip, remainingSize, &blockProperties); - if (ZSTDv05_isError(cBlockSize)) { - ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, cBlockSize); - return; - } - - ip += ZSTDv05_blockHeaderSize; - remainingSize -= ZSTDv05_blockHeaderSize; - if (cBlockSize > remainingSize) { - ZSTD_errorFrameSizeInfoLegacy(cSize, dBound, ERROR(srcSize_wrong)); - return; - } - - if (cBlockSize == 0) break; /* bt_end */ - - ip += cBlockSize; - remainingSize -= cBlockSize; - nbBlocks++; - } - - *cSize = ip - (const BYTE*)src; - *dBound = nbBlocks * BLOCKSIZE; -} - -/* ****************************** -* Streaming Decompression API -********************************/ -size_t ZSTDv05_nextSrcSizeToDecompress(ZSTDv05_DCtx* dctx) -{ - return dctx->expected; -} - -size_t ZSTDv05_decompressContinue(ZSTDv05_DCtx* dctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize) -{ - /* Sanity check */ - if (srcSize != dctx->expected) return ERROR(srcSize_wrong); - ZSTDv05_checkContinuity(dctx, dst); - - /* Decompress : frame header; part 1 */ - switch (dctx->stage) - { - case ZSTDv05ds_getFrameHeaderSize : - /* get frame header size */ - if (srcSize != ZSTDv05_frameHeaderSize_min) return ERROR(srcSize_wrong); /* impossible */ - dctx->headerSize = ZSTDv05_decodeFrameHeader_Part1(dctx, src, ZSTDv05_frameHeaderSize_min); - if (ZSTDv05_isError(dctx->headerSize)) return dctx->headerSize; - memcpy(dctx->headerBuffer, src, ZSTDv05_frameHeaderSize_min); - if (dctx->headerSize > ZSTDv05_frameHeaderSize_min) return ERROR(GENERIC); /* should never happen */ - dctx->expected = 0; /* not necessary to copy more */ - /* fallthrough */ - case ZSTDv05ds_decodeFrameHeader: - /* get frame header */ - { size_t const result = ZSTDv05_decodeFrameHeader_Part2(dctx, dctx->headerBuffer, dctx->headerSize); - if (ZSTDv05_isError(result)) return result; - dctx->expected = ZSTDv05_blockHeaderSize; - dctx->stage = ZSTDv05ds_decodeBlockHeader; - return 0; - } - case ZSTDv05ds_decodeBlockHeader: - { - /* Decode block header */ - blockProperties_t bp; - size_t blockSize = ZSTDv05_getcBlockSize(src, ZSTDv05_blockHeaderSize, &bp); - if (ZSTDv05_isError(blockSize)) return blockSize; - if (bp.blockType == bt_end) { - dctx->expected = 0; - dctx->stage = ZSTDv05ds_getFrameHeaderSize; - } - else { - dctx->expected = blockSize; - dctx->bType = bp.blockType; - dctx->stage = ZSTDv05ds_decompressBlock; - } - return 0; - } - case ZSTDv05ds_decompressBlock: - { - /* Decompress : block content */ - size_t rSize; - switch(dctx->bType) - { - case bt_compressed: - rSize = ZSTDv05_decompressBlock_internal(dctx, dst, maxDstSize, src, srcSize); - break; - case bt_raw : - rSize = ZSTDv05_copyRawBlock(dst, maxDstSize, src, srcSize); - break; - case bt_rle : - return ERROR(GENERIC); /* not yet handled */ - break; - case bt_end : /* should never happen (filtered at phase 1) */ - rSize = 0; - break; - default: - return ERROR(GENERIC); /* impossible */ - } - dctx->stage = ZSTDv05ds_decodeBlockHeader; - dctx->expected = ZSTDv05_blockHeaderSize; - dctx->previousDstEnd = (char*)dst + rSize; - return rSize; - } - default: - return ERROR(GENERIC); /* impossible */ - } -} - - -static void ZSTDv05_refDictContent(ZSTDv05_DCtx* dctx, const void* dict, size_t dictSize) -{ - dctx->dictEnd = dctx->previousDstEnd; - dctx->vBase = (const char*)dict - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->base)); - dctx->base = dict; - dctx->previousDstEnd = (const char*)dict + dictSize; -} - -static size_t ZSTDv05_loadEntropy(ZSTDv05_DCtx* dctx, const void* dict, size_t dictSize) -{ - size_t hSize, offcodeHeaderSize, matchlengthHeaderSize, errorCode, litlengthHeaderSize; - short offcodeNCount[MaxOff+1]; - unsigned offcodeMaxValue=MaxOff, offcodeLog; - short matchlengthNCount[MaxML+1]; - unsigned matchlengthMaxValue = MaxML, matchlengthLog; - short litlengthNCount[MaxLL+1]; - unsigned litlengthMaxValue = MaxLL, litlengthLog; - - hSize = HUFv05_readDTableX4(dctx->hufTableX4, dict, dictSize); - if (HUFv05_isError(hSize)) return ERROR(dictionary_corrupted); - dict = (const char*)dict + hSize; - dictSize -= hSize; - - offcodeHeaderSize = FSEv05_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dict, dictSize); - if (FSEv05_isError(offcodeHeaderSize)) return ERROR(dictionary_corrupted); - if (offcodeLog > OffFSEv05Log) return ERROR(dictionary_corrupted); - errorCode = FSEv05_buildDTable(dctx->OffTable, offcodeNCount, offcodeMaxValue, offcodeLog); - if (FSEv05_isError(errorCode)) return ERROR(dictionary_corrupted); - dict = (const char*)dict + offcodeHeaderSize; - dictSize -= offcodeHeaderSize; - - matchlengthHeaderSize = FSEv05_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dict, dictSize); - if (FSEv05_isError(matchlengthHeaderSize)) return ERROR(dictionary_corrupted); - if (matchlengthLog > MLFSEv05Log) return ERROR(dictionary_corrupted); - errorCode = FSEv05_buildDTable(dctx->MLTable, matchlengthNCount, matchlengthMaxValue, matchlengthLog); - if (FSEv05_isError(errorCode)) return ERROR(dictionary_corrupted); - dict = (const char*)dict + matchlengthHeaderSize; - dictSize -= matchlengthHeaderSize; - - litlengthHeaderSize = FSEv05_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dict, dictSize); - if (litlengthLog > LLFSEv05Log) return ERROR(dictionary_corrupted); - if (FSEv05_isError(litlengthHeaderSize)) return ERROR(dictionary_corrupted); - errorCode = FSEv05_buildDTable(dctx->LLTable, litlengthNCount, litlengthMaxValue, litlengthLog); - if (FSEv05_isError(errorCode)) return ERROR(dictionary_corrupted); - - dctx->flagStaticTables = 1; - return hSize + offcodeHeaderSize + matchlengthHeaderSize + litlengthHeaderSize; -} - -static size_t ZSTDv05_decompress_insertDictionary(ZSTDv05_DCtx* dctx, const void* dict, size_t dictSize) -{ - size_t eSize; - U32 magic = MEM_readLE32(dict); - if (magic != ZSTDv05_DICT_MAGIC) { - /* pure content mode */ - ZSTDv05_refDictContent(dctx, dict, dictSize); - return 0; - } - /* load entropy tables */ - dict = (const char*)dict + 4; - dictSize -= 4; - eSize = ZSTDv05_loadEntropy(dctx, dict, dictSize); - if (ZSTDv05_isError(eSize)) return ERROR(dictionary_corrupted); - - /* reference dictionary content */ - dict = (const char*)dict + eSize; - dictSize -= eSize; - ZSTDv05_refDictContent(dctx, dict, dictSize); - - return 0; -} - - -size_t ZSTDv05_decompressBegin_usingDict(ZSTDv05_DCtx* dctx, const void* dict, size_t dictSize) -{ - size_t errorCode; - errorCode = ZSTDv05_decompressBegin(dctx); - if (ZSTDv05_isError(errorCode)) return errorCode; - - if (dict && dictSize) { - errorCode = ZSTDv05_decompress_insertDictionary(dctx, dict, dictSize); - if (ZSTDv05_isError(errorCode)) return ERROR(dictionary_corrupted); - } - - return 0; -} - -/* - Buffered version of Zstd compression library - Copyright (C) 2015-2016, Yann Collet. - - BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are - met: - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - zstd source repository : https://github.com/Cyan4973/zstd - - ztsd public forum : https://groups.google.com/forum/#!forum/lz4c -*/ - -/* The objects defined into this file should be considered experimental. - * They are not labelled stable, as their prototype may change in the future. - * You can use them for tests, provide feedback, or if you can endure risk of future changes. - */ - - - -/* ************************************* -* Constants -***************************************/ -static size_t ZBUFFv05_blockHeaderSize = 3; - - - -/* *** Compression *** */ - -static size_t ZBUFFv05_limitCopy(void* dst, size_t maxDstSize, const void* src, size_t srcSize) -{ - size_t length = MIN(maxDstSize, srcSize); - memcpy(dst, src, length); - return length; -} - - - - -/** ************************************************ -* Streaming decompression -* -* A ZBUFFv05_DCtx object is required to track streaming operation. -* Use ZBUFFv05_createDCtx() and ZBUFFv05_freeDCtx() to create/release resources. -* Use ZBUFFv05_decompressInit() to start a new decompression operation. -* ZBUFFv05_DCtx objects can be reused multiple times. -* -* Use ZBUFFv05_decompressContinue() repetitively to consume your input. -* *srcSizePtr and *maxDstSizePtr can be any size. -* The function will report how many bytes were read or written by modifying *srcSizePtr and *maxDstSizePtr. -* Note that it may not consume the entire input, in which case it's up to the caller to call again the function with remaining input. -* The content of dst will be overwritten (up to *maxDstSizePtr) at each function call, so save its content if it matters or change dst . -* return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to improve latency) -* or 0 when a frame is completely decoded -* or an error code, which can be tested using ZBUFFv05_isError(). -* -* Hint : recommended buffer sizes (not compulsory) -* output : 128 KB block size is the internal unit, it ensures it's always possible to write a full block when it's decoded. -* input : just follow indications from ZBUFFv05_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 . -* **************************************************/ - -typedef enum { ZBUFFv05ds_init, ZBUFFv05ds_readHeader, ZBUFFv05ds_loadHeader, ZBUFFv05ds_decodeHeader, - ZBUFFv05ds_read, ZBUFFv05ds_load, ZBUFFv05ds_flush } ZBUFFv05_dStage; - -/* *** Resource management *** */ - -#define ZSTDv05_frameHeaderSize_max 5 /* too magical, should come from reference */ -struct ZBUFFv05_DCtx_s { - ZSTDv05_DCtx* zc; - ZSTDv05_parameters params; - char* inBuff; - size_t inBuffSize; - size_t inPos; - char* outBuff; - size_t outBuffSize; - size_t outStart; - size_t outEnd; - size_t hPos; - ZBUFFv05_dStage stage; - unsigned char headerBuffer[ZSTDv05_frameHeaderSize_max]; -}; /* typedef'd to ZBUFFv05_DCtx within "zstd_buffered.h" */ - - -ZBUFFv05_DCtx* ZBUFFv05_createDCtx(void) -{ - ZBUFFv05_DCtx* zbc = (ZBUFFv05_DCtx*)malloc(sizeof(ZBUFFv05_DCtx)); - if (zbc==NULL) return NULL; - memset(zbc, 0, sizeof(*zbc)); - zbc->zc = ZSTDv05_createDCtx(); - zbc->stage = ZBUFFv05ds_init; - return zbc; -} - -size_t ZBUFFv05_freeDCtx(ZBUFFv05_DCtx* zbc) -{ - if (zbc==NULL) return 0; /* support free on null */ - ZSTDv05_freeDCtx(zbc->zc); - free(zbc->inBuff); - free(zbc->outBuff); - free(zbc); - return 0; -} - - -/* *** Initialization *** */ - -size_t ZBUFFv05_decompressInitDictionary(ZBUFFv05_DCtx* zbc, const void* dict, size_t dictSize) -{ - zbc->stage = ZBUFFv05ds_readHeader; - zbc->hPos = zbc->inPos = zbc->outStart = zbc->outEnd = 0; - return ZSTDv05_decompressBegin_usingDict(zbc->zc, dict, dictSize); -} - -size_t ZBUFFv05_decompressInit(ZBUFFv05_DCtx* zbc) -{ - return ZBUFFv05_decompressInitDictionary(zbc, NULL, 0); -} - - -/* *** Decompression *** */ - -size_t ZBUFFv05_decompressContinue(ZBUFFv05_DCtx* zbc, void* dst, size_t* maxDstSizePtr, const void* src, size_t* srcSizePtr) -{ - const char* const istart = (const char*)src; - const char* ip = istart; - const char* const iend = istart + *srcSizePtr; - char* const ostart = (char*)dst; - char* op = ostart; - char* const oend = ostart + *maxDstSizePtr; - U32 notDone = 1; - - while (notDone) { - switch(zbc->stage) - { - case ZBUFFv05ds_init : - return ERROR(init_missing); - - case ZBUFFv05ds_readHeader : - /* read header from src */ - { - size_t headerSize = ZSTDv05_getFrameParams(&(zbc->params), src, *srcSizePtr); - if (ZSTDv05_isError(headerSize)) return headerSize; - if (headerSize) { - /* not enough input to decode header : tell how many bytes would be necessary */ - memcpy(zbc->headerBuffer+zbc->hPos, src, *srcSizePtr); - zbc->hPos += *srcSizePtr; - *maxDstSizePtr = 0; - zbc->stage = ZBUFFv05ds_loadHeader; - return headerSize - zbc->hPos; - } - zbc->stage = ZBUFFv05ds_decodeHeader; - break; - } - /* fall-through */ - case ZBUFFv05ds_loadHeader: - /* complete header from src */ - { - size_t headerSize = ZBUFFv05_limitCopy( - zbc->headerBuffer + zbc->hPos, ZSTDv05_frameHeaderSize_max - zbc->hPos, - src, *srcSizePtr); - zbc->hPos += headerSize; - ip += headerSize; - headerSize = ZSTDv05_getFrameParams(&(zbc->params), zbc->headerBuffer, zbc->hPos); - if (ZSTDv05_isError(headerSize)) return headerSize; - if (headerSize) { - /* not enough input to decode header : tell how many bytes would be necessary */ - *maxDstSizePtr = 0; - return headerSize - zbc->hPos; - } - // zbc->stage = ZBUFFv05ds_decodeHeader; break; /* useless : stage follows */ - } - /* fall-through */ - case ZBUFFv05ds_decodeHeader: - /* apply header to create / resize buffers */ - { - size_t neededOutSize = (size_t)1 << zbc->params.windowLog; - size_t neededInSize = BLOCKSIZE; /* a block is never > BLOCKSIZE */ - if (zbc->inBuffSize < neededInSize) { - free(zbc->inBuff); - zbc->inBuffSize = neededInSize; - zbc->inBuff = (char*)malloc(neededInSize); - if (zbc->inBuff == NULL) return ERROR(memory_allocation); - } - if (zbc->outBuffSize < neededOutSize) { - free(zbc->outBuff); - zbc->outBuffSize = neededOutSize; - zbc->outBuff = (char*)malloc(neededOutSize); - if (zbc->outBuff == NULL) return ERROR(memory_allocation); - } } - if (zbc->hPos) { - /* some data already loaded into headerBuffer : transfer into inBuff */ - memcpy(zbc->inBuff, zbc->headerBuffer, zbc->hPos); - zbc->inPos = zbc->hPos; - zbc->hPos = 0; - zbc->stage = ZBUFFv05ds_load; - break; - } - zbc->stage = ZBUFFv05ds_read; - /* fall-through */ - case ZBUFFv05ds_read: - { - size_t neededInSize = ZSTDv05_nextSrcSizeToDecompress(zbc->zc); - if (neededInSize==0) { /* end of frame */ - zbc->stage = ZBUFFv05ds_init; - notDone = 0; - break; - } - if ((size_t)(iend-ip) >= neededInSize) { - /* directly decode from src */ - size_t decodedSize = ZSTDv05_decompressContinue(zbc->zc, - zbc->outBuff + zbc->outStart, zbc->outBuffSize - zbc->outStart, - ip, neededInSize); - if (ZSTDv05_isError(decodedSize)) return decodedSize; - ip += neededInSize; - if (!decodedSize) break; /* this was just a header */ - zbc->outEnd = zbc->outStart + decodedSize; - zbc->stage = ZBUFFv05ds_flush; - break; - } - if (ip==iend) { notDone = 0; break; } /* no more input */ - zbc->stage = ZBUFFv05ds_load; - } - /* fall-through */ - case ZBUFFv05ds_load: - { - size_t neededInSize = ZSTDv05_nextSrcSizeToDecompress(zbc->zc); - size_t toLoad = neededInSize - zbc->inPos; /* should always be <= remaining space within inBuff */ - size_t loadedSize; - if (toLoad > zbc->inBuffSize - zbc->inPos) return ERROR(corruption_detected); /* should never happen */ - loadedSize = ZBUFFv05_limitCopy(zbc->inBuff + zbc->inPos, toLoad, ip, iend-ip); - ip += loadedSize; - zbc->inPos += loadedSize; - if (loadedSize < toLoad) { notDone = 0; break; } /* not enough input, wait for more */ - { - size_t decodedSize = ZSTDv05_decompressContinue(zbc->zc, - zbc->outBuff + zbc->outStart, zbc->outBuffSize - zbc->outStart, - zbc->inBuff, neededInSize); - if (ZSTDv05_isError(decodedSize)) return decodedSize; - zbc->inPos = 0; /* input is consumed */ - if (!decodedSize) { zbc->stage = ZBUFFv05ds_read; break; } /* this was just a header */ - zbc->outEnd = zbc->outStart + decodedSize; - zbc->stage = ZBUFFv05ds_flush; - // break; /* ZBUFFv05ds_flush follows */ - } - } - /* fall-through */ - case ZBUFFv05ds_flush: - { - size_t toFlushSize = zbc->outEnd - zbc->outStart; - size_t flushedSize = ZBUFFv05_limitCopy(op, oend-op, zbc->outBuff + zbc->outStart, toFlushSize); - op += flushedSize; - zbc->outStart += flushedSize; - if (flushedSize == toFlushSize) { - zbc->stage = ZBUFFv05ds_read; - if (zbc->outStart + BLOCKSIZE > zbc->outBuffSize) - zbc->outStart = zbc->outEnd = 0; - break; - } - /* cannot flush everything */ - notDone = 0; - break; - } - default: return ERROR(GENERIC); /* impossible */ - } } - - *srcSizePtr = ip-istart; - *maxDstSizePtr = op-ostart; - - { size_t nextSrcSizeHint = ZSTDv05_nextSrcSizeToDecompress(zbc->zc); - if (nextSrcSizeHint > ZBUFFv05_blockHeaderSize) nextSrcSizeHint+= ZBUFFv05_blockHeaderSize; /* get next block header too */ - nextSrcSizeHint -= zbc->inPos; /* already loaded*/ - return nextSrcSizeHint; - } -} - - - -/* ************************************* -* Tool functions -***************************************/ -unsigned ZBUFFv05_isError(size_t errorCode) { return ERR_isError(errorCode); } -const char* ZBUFFv05_getErrorName(size_t errorCode) { return ERR_getErrorName(errorCode); } - -size_t ZBUFFv05_recommendedDInSize(void) { return BLOCKSIZE + ZBUFFv05_blockHeaderSize /* block header size*/ ; } -size_t ZBUFFv05_recommendedDOutSize(void) { return BLOCKSIZE; } |