2128 lines
69 KiB
C
2128 lines
69 KiB
C
/*
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* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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/******************************************
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* Includes
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******************************************/
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#include <stddef.h> /* size_t, ptrdiff_t */
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#include "zstd_v01.h"
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#include "error_private.h"
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/******************************************
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* Static allocation
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******************************************/
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/* You can statically allocate FSE CTable/DTable as a table of unsigned using below macro */
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#define FSE_DTABLE_SIZE_U32(maxTableLog) (1 + (1<<maxTableLog))
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/* You can statically allocate Huff0 DTable as a table of unsigned short using below macro */
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#define HUF_DTABLE_SIZE_U16(maxTableLog) (1 + (1<<maxTableLog))
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#define HUF_CREATE_STATIC_DTABLE(DTable, maxTableLog) \
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unsigned short DTable[HUF_DTABLE_SIZE_U16(maxTableLog)] = { maxTableLog }
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/******************************************
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* Error Management
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******************************************/
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#define FSE_LIST_ERRORS(ITEM) \
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ITEM(FSE_OK_NoError) ITEM(FSE_ERROR_GENERIC) \
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ITEM(FSE_ERROR_tableLog_tooLarge) ITEM(FSE_ERROR_maxSymbolValue_tooLarge) ITEM(FSE_ERROR_maxSymbolValue_tooSmall) \
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ITEM(FSE_ERROR_dstSize_tooSmall) ITEM(FSE_ERROR_srcSize_wrong)\
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ITEM(FSE_ERROR_corruptionDetected) \
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ITEM(FSE_ERROR_maxCode)
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#define FSE_GENERATE_ENUM(ENUM) ENUM,
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typedef enum { FSE_LIST_ERRORS(FSE_GENERATE_ENUM) } FSE_errorCodes; /* enum is exposed, to detect & handle specific errors; compare function result to -enum value */
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/******************************************
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* FSE symbol compression API
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******************************************/
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/*
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This API consists of small unitary functions, which highly benefit from being inlined.
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You will want to enable link-time-optimization to ensure these functions are properly inlined in your binary.
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Visual seems to do it automatically.
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For gcc or clang, you'll need to add -flto flag at compilation and linking stages.
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If none of these solutions is applicable, include "fse.c" directly.
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*/
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typedef unsigned FSE_CTable; /* don't allocate that. It's just a way to be more restrictive than void* */
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typedef unsigned FSE_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */
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typedef struct
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{
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size_t bitContainer;
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int bitPos;
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char* startPtr;
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char* ptr;
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char* endPtr;
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} FSE_CStream_t;
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typedef struct
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{
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ptrdiff_t value;
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const void* stateTable;
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const void* symbolTT;
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unsigned stateLog;
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} FSE_CState_t;
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typedef struct
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{
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size_t bitContainer;
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unsigned bitsConsumed;
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const char* ptr;
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const char* start;
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} FSE_DStream_t;
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typedef struct
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{
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size_t state;
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const void* table; /* precise table may vary, depending on U16 */
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} FSE_DState_t;
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typedef enum { FSE_DStream_unfinished = 0,
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FSE_DStream_endOfBuffer = 1,
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FSE_DStream_completed = 2,
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FSE_DStream_tooFar = 3 } FSE_DStream_status; /* result of FSE_reloadDStream() */
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/* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... ?! */
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/****************************************************************
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* Tuning parameters
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****************************************************************/
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/* MEMORY_USAGE :
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* Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
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* Increasing memory usage improves compression ratio
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* Reduced memory usage can improve speed, due to cache effect
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* Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */
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#define FSE_MAX_MEMORY_USAGE 14
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#define FSE_DEFAULT_MEMORY_USAGE 13
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/* FSE_MAX_SYMBOL_VALUE :
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* Maximum symbol value authorized.
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* Required for proper stack allocation */
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#define FSE_MAX_SYMBOL_VALUE 255
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/****************************************************************
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* template functions type & suffix
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****************************************************************/
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#define FSE_FUNCTION_TYPE BYTE
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#define FSE_FUNCTION_EXTENSION
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/****************************************************************
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* Byte symbol type
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****************************************************************/
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typedef struct
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{
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unsigned short newState;
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unsigned char symbol;
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unsigned char nbBits;
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} FSE_decode_t; /* size == U32 */
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/****************************************************************
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* Compiler specifics
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****************************************************************/
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#ifdef _MSC_VER /* Visual Studio */
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# define FORCE_INLINE static __forceinline
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# include <intrin.h> /* For Visual 2005 */
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# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
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# pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */
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#else
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# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
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# if defined (__cplusplus) || defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */
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# ifdef __GNUC__
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# define FORCE_INLINE static inline __attribute__((always_inline))
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# else
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# define FORCE_INLINE static inline
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# endif
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# else
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# define FORCE_INLINE static
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# endif /* __STDC_VERSION__ */
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#endif
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/****************************************************************
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* Includes
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****************************************************************/
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#include <stdlib.h> /* malloc, free, qsort */
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#include <string.h> /* memcpy, memset */
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#include <stdio.h> /* printf (debug) */
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#ifndef MEM_ACCESS_MODULE
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#define MEM_ACCESS_MODULE
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/****************************************************************
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* Basic Types
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*****************************************************************/
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#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */
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# include <stdint.h>
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typedef uint8_t BYTE;
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typedef uint16_t U16;
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typedef int16_t S16;
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typedef uint32_t U32;
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typedef int32_t S32;
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typedef uint64_t U64;
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typedef int64_t S64;
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#else
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typedef unsigned char BYTE;
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typedef unsigned short U16;
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typedef signed short S16;
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typedef unsigned int U32;
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typedef signed int S32;
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typedef unsigned long long U64;
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typedef signed long long S64;
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#endif
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#endif /* MEM_ACCESS_MODULE */
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/****************************************************************
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* Memory I/O
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*****************************************************************/
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/* FSE_FORCE_MEMORY_ACCESS
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* By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable.
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* Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal.
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* The below switch allow to select different access method for improved performance.
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* Method 0 (default) : use `memcpy()`. Safe and portable.
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* Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable).
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* This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`.
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* Method 2 : direct access. This method is portable but violate C standard.
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* It can generate buggy code on targets generating assembly depending on alignment.
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* But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6)
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* See http://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details.
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* Prefer these methods in priority order (0 > 1 > 2)
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*/
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#ifndef FSE_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */
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# 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__) )
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# define FSE_FORCE_MEMORY_ACCESS 2
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# elif (defined(__INTEL_COMPILER) && !defined(WIN32)) || \
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(defined(__GNUC__) && ( defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) ))
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# define FSE_FORCE_MEMORY_ACCESS 1
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# endif
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#endif
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static unsigned FSE_32bits(void)
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{
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return sizeof(void*)==4;
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}
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static unsigned FSE_isLittleEndian(void)
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{
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const union { U32 i; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */
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return one.c[0];
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}
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#if defined(FSE_FORCE_MEMORY_ACCESS) && (FSE_FORCE_MEMORY_ACCESS==2)
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static U16 FSE_read16(const void* memPtr) { return *(const U16*) memPtr; }
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static U32 FSE_read32(const void* memPtr) { return *(const U32*) memPtr; }
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static U64 FSE_read64(const void* memPtr) { return *(const U64*) memPtr; }
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#elif defined(FSE_FORCE_MEMORY_ACCESS) && (FSE_FORCE_MEMORY_ACCESS==1)
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/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */
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/* currently only defined for gcc and icc */
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typedef union { U16 u16; U32 u32; U64 u64; } __attribute__((packed)) unalign;
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static U16 FSE_read16(const void* ptr) { return ((const unalign*)ptr)->u16; }
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static U32 FSE_read32(const void* ptr) { return ((const unalign*)ptr)->u32; }
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static U64 FSE_read64(const void* ptr) { return ((const unalign*)ptr)->u64; }
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#else
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static U16 FSE_read16(const void* memPtr)
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{
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U16 val; memcpy(&val, memPtr, sizeof(val)); return val;
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}
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static U32 FSE_read32(const void* memPtr)
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{
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U32 val; memcpy(&val, memPtr, sizeof(val)); return val;
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}
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static U64 FSE_read64(const void* memPtr)
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{
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U64 val; memcpy(&val, memPtr, sizeof(val)); return val;
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}
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#endif // FSE_FORCE_MEMORY_ACCESS
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static U16 FSE_readLE16(const void* memPtr)
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{
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if (FSE_isLittleEndian())
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return FSE_read16(memPtr);
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else
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{
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const BYTE* p = (const BYTE*)memPtr;
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return (U16)(p[0] + (p[1]<<8));
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}
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}
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static U32 FSE_readLE32(const void* memPtr)
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{
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if (FSE_isLittleEndian())
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return FSE_read32(memPtr);
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else
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{
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const BYTE* p = (const BYTE*)memPtr;
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return (U32)((U32)p[0] + ((U32)p[1]<<8) + ((U32)p[2]<<16) + ((U32)p[3]<<24));
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}
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}
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static U64 FSE_readLE64(const void* memPtr)
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{
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if (FSE_isLittleEndian())
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return FSE_read64(memPtr);
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else
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{
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const BYTE* p = (const BYTE*)memPtr;
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return (U64)((U64)p[0] + ((U64)p[1]<<8) + ((U64)p[2]<<16) + ((U64)p[3]<<24)
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+ ((U64)p[4]<<32) + ((U64)p[5]<<40) + ((U64)p[6]<<48) + ((U64)p[7]<<56));
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}
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}
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static size_t FSE_readLEST(const void* memPtr)
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{
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if (FSE_32bits())
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return (size_t)FSE_readLE32(memPtr);
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else
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return (size_t)FSE_readLE64(memPtr);
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}
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/****************************************************************
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* Constants
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*****************************************************************/
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#define FSE_MAX_TABLELOG (FSE_MAX_MEMORY_USAGE-2)
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#define FSE_MAX_TABLESIZE (1U<<FSE_MAX_TABLELOG)
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#define FSE_MAXTABLESIZE_MASK (FSE_MAX_TABLESIZE-1)
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#define FSE_DEFAULT_TABLELOG (FSE_DEFAULT_MEMORY_USAGE-2)
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#define FSE_MIN_TABLELOG 5
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#define FSE_TABLELOG_ABSOLUTE_MAX 15
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#if FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX
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#error "FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX is not supported"
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#endif
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/****************************************************************
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* Error Management
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****************************************************************/
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#define FSE_STATIC_ASSERT(c) { enum { FSE_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */
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/****************************************************************
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* Complex types
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****************************************************************/
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typedef struct
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{
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int deltaFindState;
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U32 deltaNbBits;
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} FSE_symbolCompressionTransform; /* total 8 bytes */
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typedef U32 DTable_max_t[FSE_DTABLE_SIZE_U32(FSE_MAX_TABLELOG)];
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/****************************************************************
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* Internal functions
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****************************************************************/
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FORCE_INLINE unsigned FSE_highbit32 (register U32 val)
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{
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# if defined(_MSC_VER) /* Visual */
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unsigned long r;
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_BitScanReverse ( &r, val );
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return (unsigned) r;
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# elif defined(__GNUC__) && (GCC_VERSION >= 304) /* GCC Intrinsic */
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return 31 - __builtin_clz (val);
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# else /* Software version */
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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 };
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U32 v = val;
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unsigned r;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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r = DeBruijnClz[ (U32) (v * 0x07C4ACDDU) >> 27];
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return r;
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# endif
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}
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/****************************************************************
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* Templates
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****************************************************************/
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/*
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designed to be included
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for type-specific functions (template emulation in C)
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Objective is to write these functions only once, for improved maintenance
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*/
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/* safety checks */
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#ifndef FSE_FUNCTION_EXTENSION
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# error "FSE_FUNCTION_EXTENSION must be defined"
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#endif
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#ifndef FSE_FUNCTION_TYPE
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# error "FSE_FUNCTION_TYPE must be defined"
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#endif
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/* Function names */
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#define FSE_CAT(X,Y) X##Y
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#define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y)
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#define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y)
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static U32 FSE_tableStep(U32 tableSize) { return (tableSize>>1) + (tableSize>>3) + 3; }
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#define FSE_DECODE_TYPE FSE_decode_t
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typedef struct {
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U16 tableLog;
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U16 fastMode;
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} FSE_DTableHeader; /* sizeof U32 */
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static size_t FSE_buildDTable
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(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog)
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{
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void* ptr = dt;
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FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
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FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*)(ptr) + 1; /* because dt is unsigned, 32-bits aligned on 32-bits */
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const U32 tableSize = 1 << tableLog;
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const U32 tableMask = tableSize-1;
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const U32 step = FSE_tableStep(tableSize);
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U16 symbolNext[FSE_MAX_SYMBOL_VALUE+1];
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U32 position = 0;
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U32 highThreshold = tableSize-1;
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const S16 largeLimit= (S16)(1 << (tableLog-1));
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U32 noLarge = 1;
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U32 s;
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/* Sanity Checks */
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if (maxSymbolValue > FSE_MAX_SYMBOL_VALUE) return (size_t)-FSE_ERROR_maxSymbolValue_tooLarge;
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if (tableLog > FSE_MAX_TABLELOG) return (size_t)-FSE_ERROR_tableLog_tooLarge;
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/* Init, lay down lowprob symbols */
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DTableH[0].tableLog = (U16)tableLog;
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for (s=0; s<=maxSymbolValue; s++)
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{
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if (normalizedCounter[s]==-1)
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{
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tableDecode[highThreshold--].symbol = (FSE_FUNCTION_TYPE)s;
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symbolNext[s] = 1;
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}
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else
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{
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if (normalizedCounter[s] >= largeLimit) noLarge=0;
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symbolNext[s] = normalizedCounter[s];
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}
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}
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/* Spread symbols */
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for (s=0; s<=maxSymbolValue; s++)
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{
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int i;
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for (i=0; i<normalizedCounter[s]; i++)
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{
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tableDecode[position].symbol = (FSE_FUNCTION_TYPE)s;
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position = (position + step) & tableMask;
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while (position > highThreshold) position = (position + step) & tableMask; /* lowprob area */
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}
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}
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if (position!=0) return (size_t)-FSE_ERROR_GENERIC; /* position must reach all cells once, otherwise normalizedCounter is incorrect */
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/* Build Decoding table */
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{
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U32 i;
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for (i=0; i<tableSize; i++)
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{
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FSE_FUNCTION_TYPE symbol = (FSE_FUNCTION_TYPE)(tableDecode[i].symbol);
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U16 nextState = symbolNext[symbol]++;
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tableDecode[i].nbBits = (BYTE) (tableLog - FSE_highbit32 ((U32)nextState) );
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tableDecode[i].newState = (U16) ( (nextState << tableDecode[i].nbBits) - tableSize);
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}
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}
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DTableH->fastMode = (U16)noLarge;
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return 0;
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}
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/******************************************
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* FSE byte symbol
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******************************************/
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#ifndef FSE_COMMONDEFS_ONLY
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static unsigned FSE_isError(size_t code) { return (code > (size_t)(-FSE_ERROR_maxCode)); }
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static short FSE_abs(short a)
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{
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return a<0? -a : a;
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}
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/****************************************************************
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* Header bitstream management
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****************************************************************/
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static size_t FSE_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsigned* tableLogPtr,
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const void* headerBuffer, size_t hbSize)
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{
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const BYTE* const istart = (const BYTE*) headerBuffer;
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const BYTE* const iend = istart + hbSize;
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const BYTE* ip = istart;
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int nbBits;
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int remaining;
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int threshold;
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U32 bitStream;
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|
int bitCount;
|
|
unsigned charnum = 0;
|
|
int previous0 = 0;
|
|
|
|
if (hbSize < 4) return (size_t)-FSE_ERROR_srcSize_wrong;
|
|
bitStream = FSE_readLE32(ip);
|
|
nbBits = (bitStream & 0xF) + FSE_MIN_TABLELOG; /* extract tableLog */
|
|
if (nbBits > FSE_TABLELOG_ABSOLUTE_MAX) return (size_t)-FSE_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 = FSE_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 (size_t)-FSE_ERROR_maxSymbolValue_tooSmall;
|
|
while (charnum < n0) normalizedCounter[charnum++] = 0;
|
|
if ((ip <= iend-7) || (ip + (bitCount>>3) <= iend-4))
|
|
{
|
|
ip += bitCount>>3;
|
|
bitCount &= 7;
|
|
bitStream = FSE_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 -= FSE_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 = FSE_readLE32(ip) >> (bitCount & 31);
|
|
}
|
|
}
|
|
}
|
|
if (remaining != 1) return (size_t)-FSE_ERROR_GENERIC;
|
|
*maxSVPtr = charnum-1;
|
|
|
|
ip += (bitCount+7)>>3;
|
|
if ((size_t)(ip-istart) > hbSize) return (size_t)-FSE_ERROR_srcSize_wrong;
|
|
return ip-istart;
|
|
}
|
|
|
|
|
|
/*********************************************************
|
|
* Decompression (Byte symbols)
|
|
*********************************************************/
|
|
static size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue)
|
|
{
|
|
void* ptr = dt;
|
|
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
|
|
FSE_decode_t* const cell = (FSE_decode_t*)(ptr) + 1; /* because dt is unsigned */
|
|
|
|
DTableH->tableLog = 0;
|
|
DTableH->fastMode = 0;
|
|
|
|
cell->newState = 0;
|
|
cell->symbol = symbolValue;
|
|
cell->nbBits = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits)
|
|
{
|
|
void* ptr = dt;
|
|
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
|
|
FSE_decode_t* const dinfo = (FSE_decode_t*)(ptr) + 1; /* because dt is unsigned */
|
|
const unsigned tableSize = 1 << nbBits;
|
|
const unsigned tableMask = tableSize - 1;
|
|
const unsigned maxSymbolValue = tableMask;
|
|
unsigned s;
|
|
|
|
/* Sanity checks */
|
|
if (nbBits < 1) return (size_t)-FSE_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;
|
|
}
|
|
|
|
|
|
/* FSE_initDStream
|
|
* Initialize a FSE_DStream_t.
|
|
* srcBuffer must point at the beginning of an FSE block.
|
|
* The function result is the size of the FSE_block (== srcSize).
|
|
* If srcSize is too small, the function will return an errorCode;
|
|
*/
|
|
static size_t FSE_initDStream(FSE_DStream_t* bitD, const void* srcBuffer, size_t srcSize)
|
|
{
|
|
if (srcSize < 1) return (size_t)-FSE_ERROR_srcSize_wrong;
|
|
|
|
if (srcSize >= sizeof(size_t))
|
|
{
|
|
U32 contain32;
|
|
bitD->start = (const char*)srcBuffer;
|
|
bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(size_t);
|
|
bitD->bitContainer = FSE_readLEST(bitD->ptr);
|
|
contain32 = ((const BYTE*)srcBuffer)[srcSize-1];
|
|
if (contain32 == 0) return (size_t)-FSE_ERROR_GENERIC; /* stop bit not present */
|
|
bitD->bitsConsumed = 8 - FSE_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);
|
|
case 6: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[5]) << (sizeof(size_t)*8 - 24);
|
|
case 5: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[4]) << (sizeof(size_t)*8 - 32);
|
|
case 4: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[3]) << 24;
|
|
case 3: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[2]) << 16;
|
|
case 2: bitD->bitContainer += (size_t)(((const BYTE*)(bitD->start))[1]) << 8;
|
|
default:;
|
|
}
|
|
contain32 = ((const BYTE*)srcBuffer)[srcSize-1];
|
|
if (contain32 == 0) return (size_t)-FSE_ERROR_GENERIC; /* stop bit not present */
|
|
bitD->bitsConsumed = 8 - FSE_highbit32(contain32);
|
|
bitD->bitsConsumed += (U32)(sizeof(size_t) - srcSize)*8;
|
|
}
|
|
|
|
return srcSize;
|
|
}
|
|
|
|
|
|
/*!FSE_lookBits
|
|
* Provides next n bits from the bitContainer.
|
|
* bitContainer is not modified (bits are still present for next read/look)
|
|
* On 32-bits, maxNbBits==25
|
|
* On 64-bits, maxNbBits==57
|
|
* return : value extracted.
|
|
*/
|
|
static size_t FSE_lookBits(FSE_DStream_t* bitD, U32 nbBits)
|
|
{
|
|
const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1;
|
|
return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask);
|
|
}
|
|
|
|
static size_t FSE_lookBitsFast(FSE_DStream_t* bitD, U32 nbBits) /* only if nbBits >= 1 !! */
|
|
{
|
|
const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1;
|
|
return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask+1)-nbBits) & bitMask);
|
|
}
|
|
|
|
static void FSE_skipBits(FSE_DStream_t* bitD, U32 nbBits)
|
|
{
|
|
bitD->bitsConsumed += nbBits;
|
|
}
|
|
|
|
|
|
/*!FSE_readBits
|
|
* Read next n bits from the bitContainer.
|
|
* On 32-bits, don't read more than maxNbBits==25
|
|
* On 64-bits, don't read more than maxNbBits==57
|
|
* Use the fast variant *only* if n >= 1.
|
|
* return : value extracted.
|
|
*/
|
|
static size_t FSE_readBits(FSE_DStream_t* bitD, U32 nbBits)
|
|
{
|
|
size_t value = FSE_lookBits(bitD, nbBits);
|
|
FSE_skipBits(bitD, nbBits);
|
|
return value;
|
|
}
|
|
|
|
static size_t FSE_readBitsFast(FSE_DStream_t* bitD, U32 nbBits) /* only if nbBits >= 1 !! */
|
|
{
|
|
size_t value = FSE_lookBitsFast(bitD, nbBits);
|
|
FSE_skipBits(bitD, nbBits);
|
|
return value;
|
|
}
|
|
|
|
static unsigned FSE_reloadDStream(FSE_DStream_t* bitD)
|
|
{
|
|
if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should never happen */
|
|
return FSE_DStream_tooFar;
|
|
|
|
if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer))
|
|
{
|
|
bitD->ptr -= bitD->bitsConsumed >> 3;
|
|
bitD->bitsConsumed &= 7;
|
|
bitD->bitContainer = FSE_readLEST(bitD->ptr);
|
|
return FSE_DStream_unfinished;
|
|
}
|
|
if (bitD->ptr == bitD->start)
|
|
{
|
|
if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return FSE_DStream_endOfBuffer;
|
|
return FSE_DStream_completed;
|
|
}
|
|
{
|
|
U32 nbBytes = bitD->bitsConsumed >> 3;
|
|
U32 result = FSE_DStream_unfinished;
|
|
if (bitD->ptr - nbBytes < bitD->start)
|
|
{
|
|
nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */
|
|
result = FSE_DStream_endOfBuffer;
|
|
}
|
|
bitD->ptr -= nbBytes;
|
|
bitD->bitsConsumed -= nbBytes*8;
|
|
bitD->bitContainer = FSE_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */
|
|
return result;
|
|
}
|
|
}
|
|
|
|
|
|
static void FSE_initDState(FSE_DState_t* DStatePtr, FSE_DStream_t* bitD, const FSE_DTable* dt)
|
|
{
|
|
const void* ptr = dt;
|
|
const FSE_DTableHeader* const DTableH = (const FSE_DTableHeader*)ptr;
|
|
DStatePtr->state = FSE_readBits(bitD, DTableH->tableLog);
|
|
FSE_reloadDStream(bitD);
|
|
DStatePtr->table = dt + 1;
|
|
}
|
|
|
|
static BYTE FSE_decodeSymbol(FSE_DState_t* DStatePtr, FSE_DStream_t* bitD)
|
|
{
|
|
const FSE_decode_t DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state];
|
|
const U32 nbBits = DInfo.nbBits;
|
|
BYTE symbol = DInfo.symbol;
|
|
size_t lowBits = FSE_readBits(bitD, nbBits);
|
|
|
|
DStatePtr->state = DInfo.newState + lowBits;
|
|
return symbol;
|
|
}
|
|
|
|
static BYTE FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, FSE_DStream_t* bitD)
|
|
{
|
|
const FSE_decode_t DInfo = ((const FSE_decode_t*)(DStatePtr->table))[DStatePtr->state];
|
|
const U32 nbBits = DInfo.nbBits;
|
|
BYTE symbol = DInfo.symbol;
|
|
size_t lowBits = FSE_readBitsFast(bitD, nbBits);
|
|
|
|
DStatePtr->state = DInfo.newState + lowBits;
|
|
return symbol;
|
|
}
|
|
|
|
/* FSE_endOfDStream
|
|
Tells if bitD has reached end of bitStream or not */
|
|
|
|
static unsigned FSE_endOfDStream(const FSE_DStream_t* bitD)
|
|
{
|
|
return ((bitD->ptr == bitD->start) && (bitD->bitsConsumed == sizeof(bitD->bitContainer)*8));
|
|
}
|
|
|
|
static unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr)
|
|
{
|
|
return DStatePtr->state == 0;
|
|
}
|
|
|
|
|
|
FORCE_INLINE size_t FSE_decompress_usingDTable_generic(
|
|
void* dst, size_t maxDstSize,
|
|
const void* cSrc, size_t cSrcSize,
|
|
const FSE_DTable* dt, const unsigned fast)
|
|
{
|
|
BYTE* const ostart = (BYTE*) dst;
|
|
BYTE* op = ostart;
|
|
BYTE* const omax = op + maxDstSize;
|
|
BYTE* const olimit = omax-3;
|
|
|
|
FSE_DStream_t bitD;
|
|
FSE_DState_t state1;
|
|
FSE_DState_t state2;
|
|
size_t errorCode;
|
|
|
|
/* Init */
|
|
errorCode = FSE_initDStream(&bitD, cSrc, cSrcSize); /* replaced last arg by maxCompressed Size */
|
|
if (FSE_isError(errorCode)) return errorCode;
|
|
|
|
FSE_initDState(&state1, &bitD, dt);
|
|
FSE_initDState(&state2, &bitD, dt);
|
|
|
|
#define FSE_GETSYMBOL(statePtr) fast ? FSE_decodeSymbolFast(statePtr, &bitD) : FSE_decodeSymbol(statePtr, &bitD)
|
|
|
|
/* 4 symbols per loop */
|
|
for ( ; (FSE_reloadDStream(&bitD)==FSE_DStream_unfinished) && (op<olimit) ; op+=4)
|
|
{
|
|
op[0] = FSE_GETSYMBOL(&state1);
|
|
|
|
if (FSE_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */
|
|
FSE_reloadDStream(&bitD);
|
|
|
|
op[1] = FSE_GETSYMBOL(&state2);
|
|
|
|
if (FSE_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */
|
|
{ if (FSE_reloadDStream(&bitD) > FSE_DStream_unfinished) { op+=2; break; } }
|
|
|
|
op[2] = FSE_GETSYMBOL(&state1);
|
|
|
|
if (FSE_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */
|
|
FSE_reloadDStream(&bitD);
|
|
|
|
op[3] = FSE_GETSYMBOL(&state2);
|
|
}
|
|
|
|
/* tail */
|
|
/* note : FSE_reloadDStream(&bitD) >= FSE_DStream_partiallyFilled; Ends at exactly FSE_DStream_completed */
|
|
while (1)
|
|
{
|
|
if ( (FSE_reloadDStream(&bitD)>FSE_DStream_completed) || (op==omax) || (FSE_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state1))) )
|
|
break;
|
|
|
|
*op++ = FSE_GETSYMBOL(&state1);
|
|
|
|
if ( (FSE_reloadDStream(&bitD)>FSE_DStream_completed) || (op==omax) || (FSE_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state2))) )
|
|
break;
|
|
|
|
*op++ = FSE_GETSYMBOL(&state2);
|
|
}
|
|
|
|
/* end ? */
|
|
if (FSE_endOfDStream(&bitD) && FSE_endOfDState(&state1) && FSE_endOfDState(&state2))
|
|
return op-ostart;
|
|
|
|
if (op==omax) return (size_t)-FSE_ERROR_dstSize_tooSmall; /* dst buffer is full, but cSrc unfinished */
|
|
|
|
return (size_t)-FSE_ERROR_corruptionDetected;
|
|
}
|
|
|
|
|
|
static size_t FSE_decompress_usingDTable(void* dst, size_t originalSize,
|
|
const void* cSrc, size_t cSrcSize,
|
|
const FSE_DTable* dt)
|
|
{
|
|
FSE_DTableHeader DTableH;
|
|
memcpy(&DTableH, dt, sizeof(DTableH)); /* memcpy() into local variable, to avoid strict aliasing warning */
|
|
|
|
/* select fast mode (static) */
|
|
if (DTableH.fastMode) return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 1);
|
|
return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 0);
|
|
}
|
|
|
|
|
|
static size_t FSE_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[FSE_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 = FSE_MAX_SYMBOL_VALUE;
|
|
size_t errorCode;
|
|
|
|
if (cSrcSize<2) return (size_t)-FSE_ERROR_srcSize_wrong; /* too small input size */
|
|
|
|
/* normal FSE decoding mode */
|
|
errorCode = FSE_readNCount (counting, &maxSymbolValue, &tableLog, istart, cSrcSize);
|
|
if (FSE_isError(errorCode)) return errorCode;
|
|
if (errorCode >= cSrcSize) return (size_t)-FSE_ERROR_srcSize_wrong; /* too small input size */
|
|
ip += errorCode;
|
|
cSrcSize -= errorCode;
|
|
|
|
errorCode = FSE_buildDTable (dt, counting, maxSymbolValue, tableLog);
|
|
if (FSE_isError(errorCode)) return errorCode;
|
|
|
|
/* always return, even if it is an error code */
|
|
return FSE_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, dt);
|
|
}
|
|
|
|
|
|
|
|
/* *******************************************************
|
|
* Huff0 : Huffman block compression
|
|
*********************************************************/
|
|
#define HUF_MAX_SYMBOL_VALUE 255
|
|
#define HUF_DEFAULT_TABLELOG 12 /* used by default, when not specified */
|
|
#define HUF_MAX_TABLELOG 12 /* max possible tableLog; for allocation purpose; can be modified */
|
|
#define HUF_ABSOLUTEMAX_TABLELOG 16 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */
|
|
#if (HUF_MAX_TABLELOG > HUF_ABSOLUTEMAX_TABLELOG)
|
|
# error "HUF_MAX_TABLELOG is too large !"
|
|
#endif
|
|
|
|
typedef struct HUF_CElt_s {
|
|
U16 val;
|
|
BYTE nbBits;
|
|
} HUF_CElt ;
|
|
|
|
typedef struct nodeElt_s {
|
|
U32 count;
|
|
U16 parent;
|
|
BYTE byte;
|
|
BYTE nbBits;
|
|
} nodeElt;
|
|
|
|
|
|
/* *******************************************************
|
|
* Huff0 : Huffman block decompression
|
|
*********************************************************/
|
|
typedef struct {
|
|
BYTE byte;
|
|
BYTE nbBits;
|
|
} HUF_DElt;
|
|
|
|
static size_t HUF_readDTable (U16* DTable, const void* src, size_t srcSize)
|
|
{
|
|
BYTE huffWeight[HUF_MAX_SYMBOL_VALUE + 1];
|
|
U32 rankVal[HUF_ABSOLUTEMAX_TABLELOG + 1]; /* large enough for values from 0 to 16 */
|
|
U32 weightTotal;
|
|
U32 maxBits;
|
|
const BYTE* ip = (const BYTE*) src;
|
|
size_t iSize;
|
|
size_t oSize;
|
|
U32 n;
|
|
U32 nextRankStart;
|
|
void* ptr = DTable+1;
|
|
HUF_DElt* const dt = (HUF_DElt*)ptr;
|
|
|
|
if (!srcSize) return (size_t)-FSE_ERROR_srcSize_wrong;
|
|
iSize = ip[0];
|
|
|
|
FSE_STATIC_ASSERT(sizeof(HUF_DElt) == sizeof(U16)); /* if compilation fails here, assertion is false */
|
|
//memset(huffWeight, 0, sizeof(huffWeight)); /* should not be necessary, but 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, sizeof(huffWeight));
|
|
iSize = 0;
|
|
}
|
|
else /* Incompressible */
|
|
{
|
|
oSize = iSize - 127;
|
|
iSize = ((oSize+1)/2);
|
|
if (iSize+1 > srcSize) return (size_t)-FSE_ERROR_srcSize_wrong;
|
|
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 FSE (normal case) */
|
|
{
|
|
if (iSize+1 > srcSize) return (size_t)-FSE_ERROR_srcSize_wrong;
|
|
oSize = FSE_decompress(huffWeight, HUF_MAX_SYMBOL_VALUE, ip+1, iSize); /* max 255 values decoded, last one is implied */
|
|
if (FSE_isError(oSize)) return oSize;
|
|
}
|
|
|
|
/* collect weight stats */
|
|
memset(rankVal, 0, sizeof(rankVal));
|
|
weightTotal = 0;
|
|
for (n=0; n<oSize; n++)
|
|
{
|
|
if (huffWeight[n] >= HUF_ABSOLUTEMAX_TABLELOG) return (size_t)-FSE_ERROR_corruptionDetected;
|
|
rankVal[huffWeight[n]]++;
|
|
weightTotal += (1 << huffWeight[n]) >> 1;
|
|
}
|
|
if (weightTotal == 0) return (size_t)-FSE_ERROR_corruptionDetected;
|
|
|
|
/* get last non-null symbol weight (implied, total must be 2^n) */
|
|
maxBits = FSE_highbit32(weightTotal) + 1;
|
|
if (maxBits > DTable[0]) return (size_t)-FSE_ERROR_tableLog_tooLarge; /* DTable is too small */
|
|
DTable[0] = (U16)maxBits;
|
|
{
|
|
U32 total = 1 << maxBits;
|
|
U32 rest = total - weightTotal;
|
|
U32 verif = 1 << FSE_highbit32(rest);
|
|
U32 lastWeight = FSE_highbit32(rest) + 1;
|
|
if (verif != rest) return (size_t)-FSE_ERROR_corruptionDetected; /* last value must be a clean power of 2 */
|
|
huffWeight[oSize] = (BYTE)lastWeight;
|
|
rankVal[lastWeight]++;
|
|
}
|
|
|
|
/* check tree construction validity */
|
|
if ((rankVal[1] < 2) || (rankVal[1] & 1)) return (size_t)-FSE_ERROR_corruptionDetected; /* by construction : at least 2 elts of rank 1, must be even */
|
|
|
|
/* Prepare ranks */
|
|
nextRankStart = 0;
|
|
for (n=1; n<=maxBits; n++)
|
|
{
|
|
U32 current = nextRankStart;
|
|
nextRankStart += (rankVal[n] << (n-1));
|
|
rankVal[n] = current;
|
|
}
|
|
|
|
/* fill DTable */
|
|
for (n=0; n<=oSize; n++)
|
|
{
|
|
const U32 w = huffWeight[n];
|
|
const U32 length = (1 << w) >> 1;
|
|
U32 i;
|
|
HUF_DElt D;
|
|
D.byte = (BYTE)n; D.nbBits = (BYTE)(maxBits + 1 - w);
|
|
for (i = rankVal[w]; i < rankVal[w] + length; i++)
|
|
dt[i] = D;
|
|
rankVal[w] += length;
|
|
}
|
|
|
|
return iSize+1;
|
|
}
|
|
|
|
|
|
static BYTE HUF_decodeSymbol(FSE_DStream_t* Dstream, const HUF_DElt* dt, const U32 dtLog)
|
|
{
|
|
const size_t val = FSE_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */
|
|
const BYTE c = dt[val].byte;
|
|
FSE_skipBits(Dstream, dt[val].nbBits);
|
|
return c;
|
|
}
|
|
|
|
static size_t HUF_decompress_usingDTable( /* -3% slower when non static */
|
|
void* dst, size_t maxDstSize,
|
|
const void* cSrc, size_t cSrcSize,
|
|
const U16* DTable)
|
|
{
|
|
BYTE* const ostart = (BYTE*) dst;
|
|
BYTE* op = ostart;
|
|
BYTE* const omax = op + maxDstSize;
|
|
BYTE* const olimit = omax-15;
|
|
|
|
const void* ptr = DTable;
|
|
const HUF_DElt* const dt = (const HUF_DElt*)(ptr)+1;
|
|
const U32 dtLog = DTable[0];
|
|
size_t errorCode;
|
|
U32 reloadStatus;
|
|
|
|
/* Init */
|
|
|
|
const U16* jumpTable = (const U16*)cSrc;
|
|
const size_t length1 = FSE_readLE16(jumpTable);
|
|
const size_t length2 = FSE_readLE16(jumpTable+1);
|
|
const size_t length3 = FSE_readLE16(jumpTable+2);
|
|
const size_t length4 = cSrcSize - 6 - length1 - length2 - length3; // check coherency !!
|
|
const char* const start1 = (const char*)(cSrc) + 6;
|
|
const char* const start2 = start1 + length1;
|
|
const char* const start3 = start2 + length2;
|
|
const char* const start4 = start3 + length3;
|
|
FSE_DStream_t bitD1, bitD2, bitD3, bitD4;
|
|
|
|
if (length1+length2+length3+6 >= cSrcSize) return (size_t)-FSE_ERROR_srcSize_wrong;
|
|
|
|
errorCode = FSE_initDStream(&bitD1, start1, length1);
|
|
if (FSE_isError(errorCode)) return errorCode;
|
|
errorCode = FSE_initDStream(&bitD2, start2, length2);
|
|
if (FSE_isError(errorCode)) return errorCode;
|
|
errorCode = FSE_initDStream(&bitD3, start3, length3);
|
|
if (FSE_isError(errorCode)) return errorCode;
|
|
errorCode = FSE_initDStream(&bitD4, start4, length4);
|
|
if (FSE_isError(errorCode)) return errorCode;
|
|
|
|
reloadStatus=FSE_reloadDStream(&bitD2);
|
|
|
|
/* 16 symbols per loop */
|
|
for ( ; (reloadStatus<FSE_DStream_completed) && (op<olimit); /* D2-3-4 are supposed to be synchronized and finish together */
|
|
op+=16, reloadStatus = FSE_reloadDStream(&bitD2) | FSE_reloadDStream(&bitD3) | FSE_reloadDStream(&bitD4), FSE_reloadDStream(&bitD1))
|
|
{
|
|
#define HUF_DECODE_SYMBOL_0(n, Dstream) \
|
|
op[n] = HUF_decodeSymbol(&Dstream, dt, dtLog);
|
|
|
|
#define HUF_DECODE_SYMBOL_1(n, Dstream) \
|
|
op[n] = HUF_decodeSymbol(&Dstream, dt, dtLog); \
|
|
if (FSE_32bits() && (HUF_MAX_TABLELOG>12)) FSE_reloadDStream(&Dstream)
|
|
|
|
#define HUF_DECODE_SYMBOL_2(n, Dstream) \
|
|
op[n] = HUF_decodeSymbol(&Dstream, dt, dtLog); \
|
|
if (FSE_32bits()) FSE_reloadDStream(&Dstream)
|
|
|
|
HUF_DECODE_SYMBOL_1( 0, bitD1);
|
|
HUF_DECODE_SYMBOL_1( 1, bitD2);
|
|
HUF_DECODE_SYMBOL_1( 2, bitD3);
|
|
HUF_DECODE_SYMBOL_1( 3, bitD4);
|
|
HUF_DECODE_SYMBOL_2( 4, bitD1);
|
|
HUF_DECODE_SYMBOL_2( 5, bitD2);
|
|
HUF_DECODE_SYMBOL_2( 6, bitD3);
|
|
HUF_DECODE_SYMBOL_2( 7, bitD4);
|
|
HUF_DECODE_SYMBOL_1( 8, bitD1);
|
|
HUF_DECODE_SYMBOL_1( 9, bitD2);
|
|
HUF_DECODE_SYMBOL_1(10, bitD3);
|
|
HUF_DECODE_SYMBOL_1(11, bitD4);
|
|
HUF_DECODE_SYMBOL_0(12, bitD1);
|
|
HUF_DECODE_SYMBOL_0(13, bitD2);
|
|
HUF_DECODE_SYMBOL_0(14, bitD3);
|
|
HUF_DECODE_SYMBOL_0(15, bitD4);
|
|
}
|
|
|
|
if (reloadStatus!=FSE_DStream_completed) /* not complete : some bitStream might be FSE_DStream_unfinished */
|
|
return (size_t)-FSE_ERROR_corruptionDetected;
|
|
|
|
/* tail */
|
|
{
|
|
// bitTail = bitD1; // *much* slower : -20% !??!
|
|
FSE_DStream_t bitTail;
|
|
bitTail.ptr = bitD1.ptr;
|
|
bitTail.bitsConsumed = bitD1.bitsConsumed;
|
|
bitTail.bitContainer = bitD1.bitContainer; // required in case of FSE_DStream_endOfBuffer
|
|
bitTail.start = start1;
|
|
for ( ; (FSE_reloadDStream(&bitTail) < FSE_DStream_completed) && (op<omax) ; op++)
|
|
{
|
|
HUF_DECODE_SYMBOL_0(0, bitTail);
|
|
}
|
|
|
|
if (FSE_endOfDStream(&bitTail))
|
|
return op-ostart;
|
|
}
|
|
|
|
if (op==omax) return (size_t)-FSE_ERROR_dstSize_tooSmall; /* dst buffer is full, but cSrc unfinished */
|
|
|
|
return (size_t)-FSE_ERROR_corruptionDetected;
|
|
}
|
|
|
|
|
|
static size_t HUF_decompress (void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize)
|
|
{
|
|
HUF_CREATE_STATIC_DTABLE(DTable, HUF_MAX_TABLELOG);
|
|
const BYTE* ip = (const BYTE*) cSrc;
|
|
size_t errorCode;
|
|
|
|
errorCode = HUF_readDTable (DTable, cSrc, cSrcSize);
|
|
if (FSE_isError(errorCode)) return errorCode;
|
|
if (errorCode >= cSrcSize) return (size_t)-FSE_ERROR_srcSize_wrong;
|
|
ip += errorCode;
|
|
cSrcSize -= errorCode;
|
|
|
|
return HUF_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, DTable);
|
|
}
|
|
|
|
|
|
#endif /* FSE_COMMONDEFS_ONLY */
|
|
|
|
/*
|
|
zstd - standard compression library
|
|
Copyright (C) 2014-2015, 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 :
|
|
- zstd source repository : https://github.com/Cyan4973/zstd
|
|
- ztsd public forum : https://groups.google.com/forum/#!forum/lz4c
|
|
*/
|
|
|
|
/****************************************************************
|
|
* 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 */
|
|
#define ZSTD_MEMORY_USAGE 17
|
|
|
|
|
|
/**************************************
|
|
CPU Feature Detection
|
|
**************************************/
|
|
/*
|
|
* Automated efficient unaligned memory access detection
|
|
* Based on known hardware architectures
|
|
* This list will be updated thanks to feedbacks
|
|
*/
|
|
#if defined(CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS) \
|
|
|| defined(__ARM_FEATURE_UNALIGNED) \
|
|
|| defined(__i386__) || defined(__x86_64__) \
|
|
|| defined(_M_IX86) || defined(_M_X64) \
|
|
|| defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_8__) \
|
|
|| (defined(_M_ARM) && (_M_ARM >= 7))
|
|
# define ZSTD_UNALIGNED_ACCESS 1
|
|
#else
|
|
# define ZSTD_UNALIGNED_ACCESS 0
|
|
#endif
|
|
|
|
|
|
/********************************************************
|
|
* Includes
|
|
*********************************************************/
|
|
#include <stdlib.h> /* calloc */
|
|
#include <string.h> /* memcpy, memmove */
|
|
#include <stdio.h> /* debug : printf */
|
|
|
|
|
|
/********************************************************
|
|
* Compiler specifics
|
|
*********************************************************/
|
|
#ifdef __AVX2__
|
|
# include <immintrin.h> /* AVX2 intrinsics */
|
|
#endif
|
|
|
|
#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
|
|
|
|
|
|
#ifndef MEM_ACCESS_MODULE
|
|
#define MEM_ACCESS_MODULE
|
|
/********************************************************
|
|
* Basic Types
|
|
*********************************************************/
|
|
#if 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;
|
|
#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;
|
|
#endif
|
|
|
|
#endif /* MEM_ACCESS_MODULE */
|
|
|
|
|
|
/********************************************************
|
|
* Constants
|
|
*********************************************************/
|
|
static const U32 ZSTD_magicNumber = 0xFD2FB51E; /* 3rd version : seqNb header */
|
|
|
|
#define HASH_LOG (ZSTD_MEMORY_USAGE - 2)
|
|
#define HASH_TABLESIZE (1 << HASH_LOG)
|
|
#define HASH_MASK (HASH_TABLESIZE - 1)
|
|
|
|
#define KNUTH 2654435761
|
|
|
|
#define BIT7 128
|
|
#define BIT6 64
|
|
#define BIT5 32
|
|
#define BIT4 16
|
|
|
|
#define KB *(1 <<10)
|
|
#define MB *(1 <<20)
|
|
#define GB *(1U<<30)
|
|
|
|
#define BLOCKSIZE (128 KB) /* define, for static allocation */
|
|
|
|
#define WORKPLACESIZE (BLOCKSIZE*3)
|
|
#define MINMATCH 4
|
|
#define MLbits 7
|
|
#define LLbits 6
|
|
#define Offbits 5
|
|
#define MaxML ((1<<MLbits )-1)
|
|
#define MaxLL ((1<<LLbits )-1)
|
|
#define MaxOff ((1<<Offbits)-1)
|
|
#define LitFSELog 11
|
|
#define MLFSELog 10
|
|
#define LLFSELog 10
|
|
#define OffFSELog 9
|
|
#define MAX(a,b) ((a)<(b)?(b):(a))
|
|
#define MaxSeq MAX(MaxLL, MaxML)
|
|
|
|
#define LITERAL_NOENTROPY 63
|
|
#define COMMAND_NOENTROPY 7 /* to remove */
|
|
|
|
static const size_t ZSTD_blockHeaderSize = 3;
|
|
static const size_t ZSTD_frameHeaderSize = 4;
|
|
|
|
|
|
/********************************************************
|
|
* Memory operations
|
|
*********************************************************/
|
|
static unsigned ZSTD_32bits(void) { return sizeof(void*)==4; }
|
|
|
|
static unsigned ZSTD_isLittleEndian(void)
|
|
{
|
|
const union { U32 i; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */
|
|
return one.c[0];
|
|
}
|
|
|
|
static U16 ZSTD_read16(const void* p) { U16 r; memcpy(&r, p, sizeof(r)); return r; }
|
|
|
|
static U32 ZSTD_read32(const void* p) { U32 r; memcpy(&r, p, sizeof(r)); return r; }
|
|
|
|
static void ZSTD_copy4(void* dst, const void* src) { memcpy(dst, src, 4); }
|
|
|
|
static void ZSTD_copy8(void* dst, const void* src) { memcpy(dst, src, 8); }
|
|
|
|
#define COPY8(d,s) { ZSTD_copy8(d,s); d+=8; s+=8; }
|
|
|
|
static void ZSTD_wildcopy(void* dst, const void* src, ptrdiff_t length)
|
|
{
|
|
const BYTE* ip = (const BYTE*)src;
|
|
BYTE* op = (BYTE*)dst;
|
|
BYTE* const oend = op + length;
|
|
while (op < oend) COPY8(op, ip);
|
|
}
|
|
|
|
static U16 ZSTD_readLE16(const void* memPtr)
|
|
{
|
|
if (ZSTD_isLittleEndian()) return ZSTD_read16(memPtr);
|
|
else
|
|
{
|
|
const BYTE* p = (const BYTE*)memPtr;
|
|
return (U16)((U16)p[0] + ((U16)p[1]<<8));
|
|
}
|
|
}
|
|
|
|
|
|
static U32 ZSTD_readLE32(const void* memPtr)
|
|
{
|
|
if (ZSTD_isLittleEndian())
|
|
return ZSTD_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));
|
|
}
|
|
}
|
|
|
|
static U32 ZSTD_readBE32(const void* memPtr)
|
|
{
|
|
const BYTE* p = (const BYTE*)memPtr;
|
|
return (U32)(((U32)p[0]<<24) + ((U32)p[1]<<16) + ((U32)p[2]<<8) + ((U32)p[3]<<0));
|
|
}
|
|
|
|
|
|
/**************************************
|
|
* Local structures
|
|
***************************************/
|
|
typedef struct ZSTD_Cctx_s ZSTD_Cctx;
|
|
|
|
typedef enum { bt_compressed, bt_raw, bt_rle, bt_end } blockType_t;
|
|
|
|
typedef struct
|
|
{
|
|
blockType_t blockType;
|
|
U32 origSize;
|
|
} blockProperties_t;
|
|
|
|
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;
|
|
} seqStore_t;
|
|
|
|
|
|
typedef struct ZSTD_Cctx_s
|
|
{
|
|
const BYTE* base;
|
|
U32 current;
|
|
U32 nextUpdate;
|
|
seqStore_t seqStore;
|
|
#ifdef __AVX2__
|
|
__m256i hashTable[HASH_TABLESIZE>>3];
|
|
#else
|
|
U32 hashTable[HASH_TABLESIZE];
|
|
#endif
|
|
BYTE buffer[WORKPLACESIZE];
|
|
} cctxi_t;
|
|
|
|
|
|
|
|
|
|
/**************************************
|
|
* Error Management
|
|
**************************************/
|
|
/* published entry point */
|
|
unsigned ZSTDv01_isError(size_t code) { return ERR_isError(code); }
|
|
|
|
|
|
/**************************************
|
|
* Tool functions
|
|
**************************************/
|
|
#define ZSTD_VERSION_MAJOR 0 /* for breaking interface changes */
|
|
#define ZSTD_VERSION_MINOR 1 /* for new (non-breaking) interface capabilities */
|
|
#define ZSTD_VERSION_RELEASE 3 /* for tweaks, bug-fixes, or development */
|
|
#define ZSTD_VERSION_NUMBER (ZSTD_VERSION_MAJOR *100*100 + ZSTD_VERSION_MINOR *100 + ZSTD_VERSION_RELEASE)
|
|
|
|
/**************************************************************
|
|
* Decompression code
|
|
**************************************************************/
|
|
|
|
size_t ZSTDv01_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 ZSTD_copyUncompressedBlock(void* dst, size_t maxDstSize, const void* src, size_t srcSize)
|
|
{
|
|
if (srcSize > maxDstSize) return ERROR(dstSize_tooSmall);
|
|
memcpy(dst, src, srcSize);
|
|
return srcSize;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_decompressLiterals(void* ctx,
|
|
void* dst, size_t maxDstSize,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
BYTE* op = (BYTE*)dst;
|
|
BYTE* const oend = op + maxDstSize;
|
|
const BYTE* ip = (const BYTE*)src;
|
|
size_t errorCode;
|
|
size_t litSize;
|
|
|
|
/* check : minimum 2, for litSize, +1, for content */
|
|
if (srcSize <= 3) return ERROR(corruption_detected);
|
|
|
|
litSize = ip[1] + (ip[0]<<8);
|
|
litSize += ((ip[-3] >> 3) & 7) << 16; // mmmmh....
|
|
op = oend - litSize;
|
|
|
|
(void)ctx;
|
|
if (litSize > maxDstSize) return ERROR(dstSize_tooSmall);
|
|
errorCode = HUF_decompress(op, litSize, ip+2, srcSize-2);
|
|
if (FSE_isError(errorCode)) return ERROR(GENERIC);
|
|
return litSize;
|
|
}
|
|
|
|
|
|
size_t ZSTDv01_decodeLiteralsBlock(void* ctx,
|
|
void* dst, size_t maxDstSize,
|
|
const BYTE** litStart, size_t* litSize,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
const BYTE* const istart = (const BYTE* const)src;
|
|
const BYTE* ip = istart;
|
|
BYTE* const ostart = (BYTE* const)dst;
|
|
BYTE* const oend = ostart + maxDstSize;
|
|
blockProperties_t litbp;
|
|
|
|
size_t litcSize = ZSTDv01_getcBlockSize(src, srcSize, &litbp);
|
|
if (ZSTDv01_isError(litcSize)) return litcSize;
|
|
if (litcSize > srcSize - ZSTD_blockHeaderSize) return ERROR(srcSize_wrong);
|
|
ip += ZSTD_blockHeaderSize;
|
|
|
|
switch(litbp.blockType)
|
|
{
|
|
case bt_raw:
|
|
*litStart = ip;
|
|
ip += litcSize;
|
|
*litSize = litcSize;
|
|
break;
|
|
case bt_rle:
|
|
{
|
|
size_t rleSize = litbp.origSize;
|
|
if (rleSize>maxDstSize) return ERROR(dstSize_tooSmall);
|
|
if (!srcSize) return ERROR(srcSize_wrong);
|
|
memset(oend - rleSize, *ip, rleSize);
|
|
*litStart = oend - rleSize;
|
|
*litSize = rleSize;
|
|
ip++;
|
|
break;
|
|
}
|
|
case bt_compressed:
|
|
{
|
|
size_t decodedLitSize = ZSTD_decompressLiterals(ctx, dst, maxDstSize, ip, litcSize);
|
|
if (ZSTDv01_isError(decodedLitSize)) return decodedLitSize;
|
|
*litStart = oend - decodedLitSize;
|
|
*litSize = decodedLitSize;
|
|
ip += litcSize;
|
|
break;
|
|
}
|
|
case bt_end:
|
|
default:
|
|
return ERROR(GENERIC);
|
|
}
|
|
|
|
return ip-istart;
|
|
}
|
|
|
|
|
|
size_t ZSTDv01_decodeSeqHeaders(int* nbSeq, const BYTE** dumpsPtr, size_t* dumpsLengthPtr,
|
|
FSE_DTable* DTableLL, FSE_DTable* DTableML, FSE_DTable* DTableOffb,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
const BYTE* const istart = (const BYTE* const)src;
|
|
const BYTE* ip = istart;
|
|
const BYTE* const iend = istart + srcSize;
|
|
U32 LLtype, Offtype, MLtype;
|
|
U32 LLlog, Offlog, MLlog;
|
|
size_t dumpsLength;
|
|
|
|
/* check */
|
|
if (srcSize < 5) return ERROR(srcSize_wrong);
|
|
|
|
/* SeqHead */
|
|
*nbSeq = ZSTD_readLE16(ip); ip+=2;
|
|
LLtype = *ip >> 6;
|
|
Offtype = (*ip >> 4) & 3;
|
|
MLtype = (*ip >> 2) & 3;
|
|
if (*ip & 2)
|
|
{
|
|
dumpsLength = ip[2];
|
|
dumpsLength += ip[1] << 8;
|
|
ip += 3;
|
|
}
|
|
else
|
|
{
|
|
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 and MaxOff */
|
|
size_t headerSize;
|
|
|
|
/* Build DTables */
|
|
switch(LLtype)
|
|
{
|
|
case bt_rle :
|
|
LLlog = 0;
|
|
FSE_buildDTable_rle(DTableLL, *ip++); break;
|
|
case bt_raw :
|
|
LLlog = LLbits;
|
|
FSE_buildDTable_raw(DTableLL, LLbits); break;
|
|
default :
|
|
{ U32 max = MaxLL;
|
|
headerSize = FSE_readNCount(norm, &max, &LLlog, ip, iend-ip);
|
|
if (FSE_isError(headerSize)) return ERROR(GENERIC);
|
|
if (LLlog > LLFSELog) return ERROR(corruption_detected);
|
|
ip += headerSize;
|
|
FSE_buildDTable(DTableLL, norm, max, LLlog);
|
|
} }
|
|
|
|
switch(Offtype)
|
|
{
|
|
case bt_rle :
|
|
Offlog = 0;
|
|
if (ip > iend-2) return ERROR(srcSize_wrong); /* min : "raw", hence no header, but at least xxLog bits */
|
|
FSE_buildDTable_rle(DTableOffb, *ip++); break;
|
|
case bt_raw :
|
|
Offlog = Offbits;
|
|
FSE_buildDTable_raw(DTableOffb, Offbits); break;
|
|
default :
|
|
{ U32 max = MaxOff;
|
|
headerSize = FSE_readNCount(norm, &max, &Offlog, ip, iend-ip);
|
|
if (FSE_isError(headerSize)) return ERROR(GENERIC);
|
|
if (Offlog > OffFSELog) return ERROR(corruption_detected);
|
|
ip += headerSize;
|
|
FSE_buildDTable(DTableOffb, norm, max, Offlog);
|
|
} }
|
|
|
|
switch(MLtype)
|
|
{
|
|
case bt_rle :
|
|
MLlog = 0;
|
|
if (ip > iend-2) return ERROR(srcSize_wrong); /* min : "raw", hence no header, but at least xxLog bits */
|
|
FSE_buildDTable_rle(DTableML, *ip++); break;
|
|
case bt_raw :
|
|
MLlog = MLbits;
|
|
FSE_buildDTable_raw(DTableML, MLbits); break;
|
|
default :
|
|
{ U32 max = MaxML;
|
|
headerSize = FSE_readNCount(norm, &max, &MLlog, ip, iend-ip);
|
|
if (FSE_isError(headerSize)) return ERROR(GENERIC);
|
|
if (MLlog > MLFSELog) return ERROR(corruption_detected);
|
|
ip += headerSize;
|
|
FSE_buildDTable(DTableML, norm, max, MLlog);
|
|
} } }
|
|
|
|
return ip-istart;
|
|
}
|
|
|
|
|
|
typedef struct {
|
|
size_t litLength;
|
|
size_t offset;
|
|
size_t matchLength;
|
|
} seq_t;
|
|
|
|
typedef struct {
|
|
FSE_DStream_t DStream;
|
|
FSE_DState_t stateLL;
|
|
FSE_DState_t stateOffb;
|
|
FSE_DState_t stateML;
|
|
size_t prevOffset;
|
|
const BYTE* dumps;
|
|
const BYTE* dumpsEnd;
|
|
} seqState_t;
|
|
|
|
|
|
static void ZSTD_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 = FSE_decodeSymbol(&(seqState->stateLL), &(seqState->DStream));
|
|
prevOffset = litLength ? seq->offset : seqState->prevOffset;
|
|
seqState->prevOffset = seq->offset;
|
|
if (litLength == MaxLL)
|
|
{
|
|
U32 add = dumps<de ? *dumps++ : 0;
|
|
if (add < 255) litLength += add;
|
|
else
|
|
{
|
|
if (dumps<=(de-3))
|
|
{
|
|
litLength = ZSTD_readLE32(dumps) & 0xFFFFFF; /* no pb : dumps is always followed by seq tables > 1 byte */
|
|
dumps += 3;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Offset */
|
|
{
|
|
U32 offsetCode, nbBits;
|
|
offsetCode = FSE_decodeSymbol(&(seqState->stateOffb), &(seqState->DStream));
|
|
if (ZSTD_32bits()) FSE_reloadDStream(&(seqState->DStream));
|
|
nbBits = offsetCode - 1;
|
|
if (offsetCode==0) nbBits = 0; /* cmove */
|
|
offset = ((size_t)1 << (nbBits & ((sizeof(offset)*8)-1))) + FSE_readBits(&(seqState->DStream), nbBits);
|
|
if (ZSTD_32bits()) FSE_reloadDStream(&(seqState->DStream));
|
|
if (offsetCode==0) offset = prevOffset;
|
|
}
|
|
|
|
/* MatchLength */
|
|
matchLength = FSE_decodeSymbol(&(seqState->stateML), &(seqState->DStream));
|
|
if (matchLength == MaxML)
|
|
{
|
|
U32 add = dumps<de ? *dumps++ : 0;
|
|
if (add < 255) matchLength += add;
|
|
else
|
|
{
|
|
if (dumps<=(de-3))
|
|
{
|
|
matchLength = ZSTD_readLE32(dumps) & 0xFFFFFF; /* no pb : dumps is always followed by seq tables > 1 byte */
|
|
dumps += 3;
|
|
}
|
|
}
|
|
}
|
|
matchLength += MINMATCH;
|
|
|
|
/* save result */
|
|
seq->litLength = litLength;
|
|
seq->offset = offset;
|
|
seq->matchLength = matchLength;
|
|
seqState->dumps = dumps;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_execSequence(BYTE* op,
|
|
seq_t sequence,
|
|
const BYTE** litPtr, const BYTE* const litLimit,
|
|
BYTE* const base, BYTE* const oend)
|
|
{
|
|
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}; /* substracted */
|
|
const BYTE* const ostart = op;
|
|
const size_t litLength = sequence.litLength;
|
|
BYTE* const endMatch = op + litLength + sequence.matchLength; /* risk : address space overflow (32-bits) */
|
|
const BYTE* const litEnd = *litPtr + litLength;
|
|
|
|
/* check */
|
|
if (endMatch > oend) return ERROR(dstSize_tooSmall); /* overwrite beyond dst buffer */
|
|
if (litEnd > litLimit) return ERROR(corruption_detected);
|
|
if (sequence.matchLength > (size_t)(*litPtr-op)) return ERROR(dstSize_tooSmall); /* overwrite literal segment */
|
|
|
|
/* copy Literals */
|
|
if (((size_t)(*litPtr - op) < 8) || ((size_t)(oend-litEnd) < 8) || (op+litLength > oend-8))
|
|
memmove(op, *litPtr, litLength); /* overwrite risk */
|
|
else
|
|
ZSTD_wildcopy(op, *litPtr, litLength);
|
|
op += litLength;
|
|
*litPtr = litEnd; /* update for next sequence */
|
|
|
|
/* check : last match must be at a minimum distance of 8 from end of dest buffer */
|
|
if (oend-op < 8) return ERROR(dstSize_tooSmall);
|
|
|
|
/* copy Match */
|
|
{
|
|
const U32 overlapRisk = (((size_t)(litEnd - endMatch)) < 12);
|
|
const BYTE* match = op - sequence.offset; /* possible underflow at op - offset ? */
|
|
size_t qutt = 12;
|
|
U64 saved[2];
|
|
|
|
/* check */
|
|
if (match < base) return ERROR(corruption_detected);
|
|
if (sequence.offset > (size_t)base) return ERROR(corruption_detected);
|
|
|
|
/* save beginning of literal sequence, in case of write overlap */
|
|
if (overlapRisk)
|
|
{
|
|
if ((endMatch + qutt) > oend) qutt = oend-endMatch;
|
|
memcpy(saved, endMatch, qutt);
|
|
}
|
|
|
|
if (sequence.offset < 8)
|
|
{
|
|
const int dec64 = dec64table[sequence.offset];
|
|
op[0] = match[0];
|
|
op[1] = match[1];
|
|
op[2] = match[2];
|
|
op[3] = match[3];
|
|
match += dec32table[sequence.offset];
|
|
ZSTD_copy4(op+4, match);
|
|
match -= dec64;
|
|
} else { ZSTD_copy8(op, match); }
|
|
op += 8; match += 8;
|
|
|
|
if (endMatch > oend-(16-MINMATCH))
|
|
{
|
|
if (op < oend-8)
|
|
{
|
|
ZSTD_wildcopy(op, match, (oend-8) - op);
|
|
match += (oend-8) - op;
|
|
op = oend-8;
|
|
}
|
|
while (op<endMatch) *op++ = *match++;
|
|
}
|
|
else
|
|
ZSTD_wildcopy(op, match, (ptrdiff_t)sequence.matchLength-8); /* works even if matchLength < 8 */
|
|
|
|
/* restore, in case of overlap */
|
|
if (overlapRisk) memcpy(endMatch, saved, qutt);
|
|
}
|
|
|
|
return endMatch-ostart;
|
|
}
|
|
|
|
typedef struct ZSTDv01_Dctx_s
|
|
{
|
|
U32 LLTable[FSE_DTABLE_SIZE_U32(LLFSELog)];
|
|
U32 OffTable[FSE_DTABLE_SIZE_U32(OffFSELog)];
|
|
U32 MLTable[FSE_DTABLE_SIZE_U32(MLFSELog)];
|
|
void* previousDstEnd;
|
|
void* base;
|
|
size_t expected;
|
|
blockType_t bType;
|
|
U32 phase;
|
|
} dctx_t;
|
|
|
|
|
|
static size_t ZSTD_decompressSequences(
|
|
void* ctx,
|
|
void* dst, size_t maxDstSize,
|
|
const void* seqStart, size_t seqSize,
|
|
const BYTE* litStart, size_t litSize)
|
|
{
|
|
dctx_t* dctx = (dctx_t*)ctx;
|
|
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;
|
|
const BYTE* litPtr = litStart;
|
|
const BYTE* const litEnd = litStart + litSize;
|
|
int nbSeq;
|
|
const BYTE* dumps;
|
|
U32* DTableLL = dctx->LLTable;
|
|
U32* DTableML = dctx->MLTable;
|
|
U32* DTableOffb = dctx->OffTable;
|
|
BYTE* const base = (BYTE*) (dctx->base);
|
|
|
|
/* Build Decoding Tables */
|
|
errorCode = ZSTDv01_decodeSeqHeaders(&nbSeq, &dumps, &dumpsLength,
|
|
DTableLL, DTableML, DTableOffb,
|
|
ip, iend-ip);
|
|
if (ZSTDv01_isError(errorCode)) return errorCode;
|
|
ip += errorCode;
|
|
|
|
/* Regen sequences */
|
|
{
|
|
seq_t sequence;
|
|
seqState_t seqState;
|
|
|
|
memset(&sequence, 0, sizeof(sequence));
|
|
seqState.dumps = dumps;
|
|
seqState.dumpsEnd = dumps + dumpsLength;
|
|
seqState.prevOffset = 1;
|
|
errorCode = FSE_initDStream(&(seqState.DStream), ip, iend-ip);
|
|
if (FSE_isError(errorCode)) return ERROR(corruption_detected);
|
|
FSE_initDState(&(seqState.stateLL), &(seqState.DStream), DTableLL);
|
|
FSE_initDState(&(seqState.stateOffb), &(seqState.DStream), DTableOffb);
|
|
FSE_initDState(&(seqState.stateML), &(seqState.DStream), DTableML);
|
|
|
|
for ( ; (FSE_reloadDStream(&(seqState.DStream)) <= FSE_DStream_completed) && (nbSeq>0) ; )
|
|
{
|
|
size_t oneSeqSize;
|
|
nbSeq--;
|
|
ZSTD_decodeSequence(&sequence, &seqState);
|
|
oneSeqSize = ZSTD_execSequence(op, sequence, &litPtr, litEnd, base, oend);
|
|
if (ZSTDv01_isError(oneSeqSize)) return oneSeqSize;
|
|
op += oneSeqSize;
|
|
}
|
|
|
|
/* check if reached exact end */
|
|
if ( !FSE_endOfDStream(&(seqState.DStream)) ) return ERROR(corruption_detected); /* requested too much : data is corrupted */
|
|
if (nbSeq<0) return ERROR(corruption_detected); /* requested too many sequences : data is corrupted */
|
|
|
|
/* last literal segment */
|
|
{
|
|
size_t lastLLSize = litEnd - litPtr;
|
|
if (op+lastLLSize > oend) return ERROR(dstSize_tooSmall);
|
|
if (op != litPtr) memmove(op, litPtr, lastLLSize);
|
|
op += lastLLSize;
|
|
}
|
|
}
|
|
|
|
return op-ostart;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_decompressBlock(
|
|
void* ctx,
|
|
void* dst, size_t maxDstSize,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
/* blockType == blockCompressed, srcSize is trusted */
|
|
const BYTE* ip = (const BYTE*)src;
|
|
const BYTE* litPtr = NULL;
|
|
size_t litSize = 0;
|
|
size_t errorCode;
|
|
|
|
/* Decode literals sub-block */
|
|
errorCode = ZSTDv01_decodeLiteralsBlock(ctx, dst, maxDstSize, &litPtr, &litSize, src, srcSize);
|
|
if (ZSTDv01_isError(errorCode)) return errorCode;
|
|
ip += errorCode;
|
|
srcSize -= errorCode;
|
|
|
|
return ZSTD_decompressSequences(ctx, dst, maxDstSize, ip, srcSize, litPtr, litSize);
|
|
}
|
|
|
|
|
|
size_t ZSTDv01_decompressDCtx(void* ctx, 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;
|
|
U32 magicNumber;
|
|
size_t errorCode=0;
|
|
blockProperties_t blockProperties;
|
|
|
|
/* Frame Header */
|
|
if (srcSize < ZSTD_frameHeaderSize+ZSTD_blockHeaderSize) return ERROR(srcSize_wrong);
|
|
magicNumber = ZSTD_readBE32(src);
|
|
if (magicNumber != ZSTD_magicNumber) return ERROR(prefix_unknown);
|
|
ip += ZSTD_frameHeaderSize; remainingSize -= ZSTD_frameHeaderSize;
|
|
|
|
/* Loop on each block */
|
|
while (1)
|
|
{
|
|
size_t blockSize = ZSTDv01_getcBlockSize(ip, iend-ip, &blockProperties);
|
|
if (ZSTDv01_isError(blockSize)) return blockSize;
|
|
|
|
ip += ZSTD_blockHeaderSize;
|
|
remainingSize -= ZSTD_blockHeaderSize;
|
|
if (blockSize > remainingSize) return ERROR(srcSize_wrong);
|
|
|
|
switch(blockProperties.blockType)
|
|
{
|
|
case bt_compressed:
|
|
errorCode = ZSTD_decompressBlock(ctx, op, oend-op, ip, blockSize);
|
|
break;
|
|
case bt_raw :
|
|
errorCode = ZSTD_copyUncompressedBlock(op, oend-op, ip, blockSize);
|
|
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);
|
|
}
|
|
if (blockSize == 0) break; /* bt_end */
|
|
|
|
if (ZSTDv01_isError(errorCode)) return errorCode;
|
|
op += errorCode;
|
|
ip += blockSize;
|
|
remainingSize -= blockSize;
|
|
}
|
|
|
|
return op-ostart;
|
|
}
|
|
|
|
size_t ZSTDv01_decompress(void* dst, size_t maxDstSize, const void* src, size_t srcSize)
|
|
{
|
|
dctx_t ctx;
|
|
ctx.base = dst;
|
|
return ZSTDv01_decompressDCtx(&ctx, dst, maxDstSize, src, srcSize);
|
|
}
|
|
|
|
size_t ZSTDv01_findFrameCompressedSize(const void* src, size_t srcSize)
|
|
{
|
|
const BYTE* ip = (const BYTE*)src;
|
|
size_t remainingSize = srcSize;
|
|
U32 magicNumber;
|
|
blockProperties_t blockProperties;
|
|
|
|
/* Frame Header */
|
|
if (srcSize < ZSTD_frameHeaderSize+ZSTD_blockHeaderSize) return ERROR(srcSize_wrong);
|
|
magicNumber = ZSTD_readBE32(src);
|
|
if (magicNumber != ZSTD_magicNumber) return ERROR(prefix_unknown);
|
|
ip += ZSTD_frameHeaderSize; remainingSize -= ZSTD_frameHeaderSize;
|
|
|
|
/* Loop on each block */
|
|
while (1)
|
|
{
|
|
size_t blockSize = ZSTDv01_getcBlockSize(ip, remainingSize, &blockProperties);
|
|
if (ZSTDv01_isError(blockSize)) return blockSize;
|
|
|
|
ip += ZSTD_blockHeaderSize;
|
|
remainingSize -= ZSTD_blockHeaderSize;
|
|
if (blockSize > remainingSize) return ERROR(srcSize_wrong);
|
|
|
|
if (blockSize == 0) break; /* bt_end */
|
|
|
|
ip += blockSize;
|
|
remainingSize -= blockSize;
|
|
}
|
|
|
|
return ip - (const BYTE*)src;
|
|
}
|
|
|
|
/*******************************
|
|
* Streaming Decompression API
|
|
*******************************/
|
|
|
|
size_t ZSTDv01_resetDCtx(ZSTDv01_Dctx* dctx)
|
|
{
|
|
dctx->expected = ZSTD_frameHeaderSize;
|
|
dctx->phase = 0;
|
|
dctx->previousDstEnd = NULL;
|
|
dctx->base = NULL;
|
|
return 0;
|
|
}
|
|
|
|
ZSTDv01_Dctx* ZSTDv01_createDCtx(void)
|
|
{
|
|
ZSTDv01_Dctx* dctx = (ZSTDv01_Dctx*)malloc(sizeof(ZSTDv01_Dctx));
|
|
if (dctx==NULL) return NULL;
|
|
ZSTDv01_resetDCtx(dctx);
|
|
return dctx;
|
|
}
|
|
|
|
size_t ZSTDv01_freeDCtx(ZSTDv01_Dctx* dctx)
|
|
{
|
|
free(dctx);
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTDv01_nextSrcSizeToDecompress(ZSTDv01_Dctx* dctx)
|
|
{
|
|
return ((dctx_t*)dctx)->expected;
|
|
}
|
|
|
|
size_t ZSTDv01_decompressContinue(ZSTDv01_Dctx* dctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize)
|
|
{
|
|
dctx_t* ctx = (dctx_t*)dctx;
|
|
|
|
/* Sanity check */
|
|
if (srcSize != ctx->expected) return ERROR(srcSize_wrong);
|
|
if (dst != ctx->previousDstEnd) /* not contiguous */
|
|
ctx->base = dst;
|
|
|
|
/* Decompress : frame header */
|
|
if (ctx->phase == 0)
|
|
{
|
|
/* Check frame magic header */
|
|
U32 magicNumber = ZSTD_readBE32(src);
|
|
if (magicNumber != ZSTD_magicNumber) return ERROR(prefix_unknown);
|
|
ctx->phase = 1;
|
|
ctx->expected = ZSTD_blockHeaderSize;
|
|
return 0;
|
|
}
|
|
|
|
/* Decompress : block header */
|
|
if (ctx->phase == 1)
|
|
{
|
|
blockProperties_t bp;
|
|
size_t blockSize = ZSTDv01_getcBlockSize(src, ZSTD_blockHeaderSize, &bp);
|
|
if (ZSTDv01_isError(blockSize)) return blockSize;
|
|
if (bp.blockType == bt_end)
|
|
{
|
|
ctx->expected = 0;
|
|
ctx->phase = 0;
|
|
}
|
|
else
|
|
{
|
|
ctx->expected = blockSize;
|
|
ctx->bType = bp.blockType;
|
|
ctx->phase = 2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Decompress : block content */
|
|
{
|
|
size_t rSize;
|
|
switch(ctx->bType)
|
|
{
|
|
case bt_compressed:
|
|
rSize = ZSTD_decompressBlock(ctx, dst, maxDstSize, src, srcSize);
|
|
break;
|
|
case bt_raw :
|
|
rSize = ZSTD_copyUncompressedBlock(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);
|
|
}
|
|
ctx->phase = 1;
|
|
ctx->expected = ZSTD_blockHeaderSize;
|
|
ctx->previousDstEnd = (void*)( ((char*)dst) + rSize);
|
|
return rSize;
|
|
}
|
|
|
|
}
|