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authorAnton Samokhvalov <pg83@yandex.ru>2022-02-10 16:45:17 +0300
committerDaniil Cherednik <dcherednik@yandex-team.ru>2022-02-10 16:45:17 +0300
commitd3a398281c6fd1d3672036cb2d63f842d2cb28c5 (patch)
treedd4bd3ca0f36b817e96812825ffaf10d645803f2 /contrib/libs/zstd06/legacy/zstd_v03.c
parent72cb13b4aff9bc9cf22e49251bc8fd143f82538f (diff)
downloadydb-d3a398281c6fd1d3672036cb2d63f842d2cb28c5.tar.gz
Restoring authorship annotation for Anton Samokhvalov <pg83@yandex.ru>. Commit 2 of 2.
Diffstat (limited to 'contrib/libs/zstd06/legacy/zstd_v03.c')
-rw-r--r--contrib/libs/zstd06/legacy/zstd_v03.c6772
1 files changed, 3386 insertions, 3386 deletions
diff --git a/contrib/libs/zstd06/legacy/zstd_v03.c b/contrib/libs/zstd06/legacy/zstd_v03.c
index 8a30ecd35c..f06b47fdc1 100644
--- a/contrib/libs/zstd06/legacy/zstd_v03.c
+++ b/contrib/libs/zstd06/legacy/zstd_v03.c
@@ -1,3389 +1,3389 @@
-/* ******************************************************************
- Error codes and messages
- 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 ERROR_H_MODULE
-#define ERROR_H_MODULE
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-#include <stddef.h> /* size_t, ptrdiff_t */
-#include "zstd_v03.h"
-
-/******************************************
-* Compiler-specific
-******************************************/
-#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
-# define ERR_STATIC static inline
-#elif defined(_MSC_VER)
-# define ERR_STATIC static __inline
-#elif defined(__GNUC__)
-# define ERR_STATIC static __attribute__((unused))
-#else
-# define ERR_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */
-#endif
-
-
-/******************************************
-* Error Management
-******************************************/
-#define PREFIX(name) ZSTD_error_##name
-
-#define ERROR(name) (size_t)-PREFIX(name)
-
-#define ERROR_LIST(ITEM) \
- ITEM(PREFIX(No_Error)) ITEM(PREFIX(GENERIC)) \
- ITEM(PREFIX(memory_allocation)) \
- ITEM(PREFIX(dstSize_tooSmall)) ITEM(PREFIX(srcSize_wrong)) \
- ITEM(PREFIX(prefix_unknown)) ITEM(PREFIX(corruption_detected)) \
- ITEM(PREFIX(tableLog_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooSmall)) \
- ITEM(PREFIX(maxCode))
-
-#define ERROR_GENERATE_ENUM(ENUM) ENUM,
-typedef enum { ERROR_LIST(ERROR_GENERATE_ENUM) } ERR_codes; /* enum is exposed, to detect & handle specific errors; compare function result to -enum value */
-
-#define ERROR_CONVERTTOSTRING(STRING) #STRING,
-#define ERROR_GENERATE_STRING(EXPR) ERROR_CONVERTTOSTRING(EXPR)
-
-ERR_STATIC unsigned ERR_isError(size_t code) { return (code > ERROR(maxCode)); }
-
-
-#if defined (__cplusplus)
-}
-#endif
-
-#endif /* ERROR_H_MODULE */
-
-
-/* ******************************************************************
- 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 :
- - FSE 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
-
-/******************************************
-* Includes
-******************************************/
-#include <stddef.h> /* size_t, ptrdiff_t */
-#include <string.h> /* memcpy */
-
-
-/******************************************
-* Compiler-specific
-******************************************/
-#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 generating assembly depending on alignment.
- * But 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(__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 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; } __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 void MEM_writeLE32(void* memPtr, U32 val32)
-{
- if (MEM_isLittleEndian())
- {
- MEM_write32(memPtr, val32);
- }
- else
- {
- BYTE* p = (BYTE*)memPtr;
- p[0] = (BYTE)val32;
- p[1] = (BYTE)(val32>>8);
- p[2] = (BYTE)(val32>>16);
- p[3] = (BYTE)(val32>>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 void MEM_writeLE64(void* memPtr, U64 val64)
-{
- if (MEM_isLittleEndian())
- {
- MEM_write64(memPtr, val64);
- }
- else
- {
- BYTE* p = (BYTE*)memPtr;
- p[0] = (BYTE)val64;
- p[1] = (BYTE)(val64>>8);
- p[2] = (BYTE)(val64>>16);
- p[3] = (BYTE)(val64>>24);
- p[4] = (BYTE)(val64>>32);
- p[5] = (BYTE)(val64>>40);
- p[6] = (BYTE)(val64>>48);
- p[7] = (BYTE)(val64>>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);
-}
-
-MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val)
-{
- if (MEM_32bits())
- MEM_writeLE32(memPtr, (U32)val);
- else
- MEM_writeLE64(memPtr, (U64)val);
-}
-
-#if defined (__cplusplus)
-}
-#endif
-
-#endif /* MEM_H_MODULE */
-
-
-/* ******************************************************************
- bitstream
- Part of NewGen Entropy library
- header file (to include)
- 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 BITSTREAM_H_MODULE
-#define BITSTREAM_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 decompression API (read backward)
-**********************************************/
-typedef struct
-{
- size_t bitContainer;
- unsigned bitsConsumed;
- const char* ptr;
- const char* start;
-} BIT_DStream_t;
-
-typedef enum { BIT_DStream_unfinished = 0,
- BIT_DStream_endOfBuffer = 1,
- BIT_DStream_completed = 2,
- BIT_DStream_overflow = 3 } BIT_DStream_status; /* result of BIT_reloadDStream() */
- /* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */
-
-MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize);
-MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, unsigned nbBits);
-MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD);
-MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* bitD);
-
-
-/*
-* Start by invoking BIT_initDStream().
-* A chunk of the bitStream is then stored into a local register.
-* Local register size is 64-bits on 64-bits systems, 32-bits on 32-bits systems (size_t).
-* You can then retrieve bitFields stored into the local register, **in reverse order**.
-* Local register is manually filled from memory by the BIT_reloadDStream() method.
-* A reload guarantee a minimum of ((8*sizeof(size_t))-7) bits when its result is BIT_DStream_unfinished.
-* Otherwise, it can be less than that, so proceed accordingly.
-* Checking if DStream has reached its end can be performed with BIT_endOfDStream()
-*/
-
-
-/******************************************
-* unsafe API
-******************************************/
-MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, unsigned nbBits);
-/* faster, but works only if nbBits >= 1 */
-
-
-
-/****************************************************************
-* Helper functions
-****************************************************************/
-MEM_STATIC unsigned BIT_highbit32 (register 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
-**********************************************************/
-
-/*!BIT_initDStream
-* Initialize a BIT_DStream_t.
-* @bitD : a pointer to an already allocated BIT_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 BIT_initDStream(BIT_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 - BIT_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 ERROR(GENERIC); /* endMark not present */
- bitD->bitsConsumed = 8 - BIT_highbit32(contain32);
- bitD->bitsConsumed += (U32)(sizeof(size_t) - srcSize)*8;
- }
-
- return srcSize;
-}
-
-/*!BIT_lookBits
- * Provides next n bits from local register
- * local register is not modified (bits are still present for next read/look)
- * On 32-bits, maxNbBits==25
- * On 64-bits, maxNbBits==57
- * @return : value extracted
- */
-MEM_STATIC size_t BIT_lookBits(BIT_DStream_t* bitD, U32 nbBits)
-{
- const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1;
- return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask);
-}
-
-/*! BIT_lookBitsFast :
-* unsafe version; only works only if nbBits >= 1 */
-MEM_STATIC size_t BIT_lookBitsFast(BIT_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 BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits)
-{
- bitD->bitsConsumed += nbBits;
-}
-
-/*!BIT_readBits
- * Read next n bits from local register.
- * pay attention to not read more than nbBits contained into local register.
- * @return : extracted value.
- */
-MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, U32 nbBits)
-{
- size_t value = BIT_lookBits(bitD, nbBits);
- BIT_skipBits(bitD, nbBits);
- return value;
-}
-
-/*!BIT_readBitsFast :
-* unsafe version; only works only if nbBits >= 1 */
-MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, U32 nbBits)
-{
- size_t value = BIT_lookBitsFast(bitD, nbBits);
- BIT_skipBits(bitD, nbBits);
- return value;
-}
-
-MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD)
-{
- if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should never happen */
- return BIT_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 BIT_DStream_unfinished;
- }
- if (bitD->ptr == bitD->start)
- {
- if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return BIT_DStream_endOfBuffer;
- return BIT_DStream_completed;
- }
- {
- U32 nbBytes = bitD->bitsConsumed >> 3;
- BIT_DStream_status result = BIT_DStream_unfinished;
- if (bitD->ptr - nbBytes < bitD->start)
- {
- nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */
- result = BIT_DStream_endOfBuffer;
- }
- bitD->ptr -= nbBytes;
- bitD->bitsConsumed -= nbBytes*8;
- bitD->bitContainer = MEM_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */
- return result;
- }
-}
-
-/*! BIT_endOfDStream
-* @return Tells if DStream has reached its exact end
-*/
-MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* DStream)
-{
- return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer)*8));
-}
-
-#if defined (__cplusplus)
-}
-#endif
-
-#endif /* BITSTREAM_H_MODULE */
-/* ******************************************************************
- Error codes and messages
- 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 ERROR_H_MODULE
-#define ERROR_H_MODULE
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-
-/******************************************
-* Compiler-specific
-******************************************/
-#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
-# define ERR_STATIC static inline
-#elif defined(_MSC_VER)
-# define ERR_STATIC static __inline
-#elif defined(__GNUC__)
-# define ERR_STATIC static __attribute__((unused))
-#else
-# define ERR_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */
-#endif
-
-
-/******************************************
-* Error Management
-******************************************/
-#define PREFIX(name) ZSTD_error_##name
-
-#define ERROR(name) (size_t)-PREFIX(name)
-
-#define ERROR_LIST(ITEM) \
- ITEM(PREFIX(No_Error)) ITEM(PREFIX(GENERIC)) \
- ITEM(PREFIX(dstSize_tooSmall)) ITEM(PREFIX(srcSize_wrong)) \
- ITEM(PREFIX(prefix_unknown)) ITEM(PREFIX(corruption_detected)) \
- ITEM(PREFIX(tableLog_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooSmall)) \
- ITEM(PREFIX(maxCode))
-
-#define ERROR_GENERATE_ENUM(ENUM) ENUM,
-typedef enum { ERROR_LIST(ERROR_GENERATE_ENUM) } ERR_codes; /* enum is exposed, to detect & handle specific errors; compare function result to -enum value */
-
-#define ERROR_CONVERTTOSTRING(STRING) #STRING,
-#define ERROR_GENERATE_STRING(EXPR) ERROR_CONVERTTOSTRING(EXPR)
-static const char* ERR_strings[] = { ERROR_LIST(ERROR_GENERATE_STRING) };
-
-ERR_STATIC unsigned ERR_isError(size_t code) { return (code > ERROR(maxCode)); }
-
-ERR_STATIC const char* ERR_getErrorName(size_t code)
-{
- static const char* codeError = "Unspecified error code";
- if (ERR_isError(code)) return ERR_strings[-(int)(code)];
- return codeError;
-}
-
-
-#if defined (__cplusplus)
-}
-#endif
-
-#endif /* ERROR_H_MODULE */
-/*
-Constructor and Destructor of type FSE_CTable
- Note that its size depends on 'tableLog' and 'maxSymbolValue' */
-typedef unsigned FSE_CTable; /* don't allocate that. It's just a way to be more restrictive than void* */
-typedef unsigned FSE_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */
-
-
-/* ******************************************************************
- FSE : 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
-****************************************************************** */
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-
-/******************************************
-* Static allocation
-******************************************/
-/* FSE buffer bounds */
-#define FSE_NCOUNTBOUND 512
-#define FSE_BLOCKBOUND(size) (size + (size>>7))
-#define FSE_COMPRESSBOUND(size) (FSE_NCOUNTBOUND + FSE_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
-
-/* You can statically allocate FSE CTable/DTable as a table of unsigned using below macro */
-#define FSE_CTABLE_SIZE_U32(maxTableLog, maxSymbolValue) (1 + (1<<(maxTableLog-1)) + ((maxSymbolValue+1)*2))
-#define FSE_DTABLE_SIZE_U32(maxTableLog) (1 + (1<<maxTableLog))
-
-
-/******************************************
-* FSE advanced API
-******************************************/
-static size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits);
-/* build a fake FSE_DTable, designed to read an uncompressed bitstream where each symbol uses nbBits */
-
-static size_t FSE_buildDTable_rle (FSE_DTable* dt, unsigned char symbolValue);
-/* build a fake FSE_DTable, designed to always generate the same symbolValue */
-
-
-/******************************************
-* FSE symbol decompression API
-******************************************/
-typedef struct
-{
- size_t state;
- const void* table; /* precise table may vary, depending on U16 */
-} FSE_DState_t;
-
-
-static void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt);
-
-static unsigned char FSE_decodeSymbol(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD);
-
-static unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr);
-
-/*
-Let's now decompose FSE_decompress_usingDTable() into its unitary components.
-You will decode FSE-encoded symbols from the bitStream,
-and also any other bitFields you put in, **in reverse order**.
-
-You will need a few variables to track your bitStream. They are :
-
-BIT_DStream_t DStream; // Stream context
-FSE_DState_t DState; // State context. Multiple ones are possible
-FSE_DTable* DTablePtr; // Decoding table, provided by FSE_buildDTable()
-
-The first thing to do is to init the bitStream.
- errorCode = BIT_initDStream(&DStream, srcBuffer, srcSize);
-
-You should then retrieve your initial state(s)
-(in reverse flushing order if you have several ones) :
- errorCode = FSE_initDState(&DState, &DStream, DTablePtr);
-
-You can then decode your data, symbol after symbol.
-For information the maximum number of bits read by FSE_decodeSymbol() is 'tableLog'.
-Keep in mind that symbols are decoded in reverse order, like a LIFO stack (last in, first out).
- unsigned char symbol = FSE_decodeSymbol(&DState, &DStream);
-
-You can retrieve any bitfield you eventually stored into the bitStream (in reverse order)
-Note : maximum allowed nbBits is 25, for 32-bits compatibility
- size_t bitField = BIT_readBits(&DStream, nbBits);
-
-All above operations only read from local register (which size depends on size_t).
-Refueling the register from memory is manually performed by the reload method.
- endSignal = FSE_reloadDStream(&DStream);
-
-BIT_reloadDStream() result tells if there is still some more data to read from DStream.
-BIT_DStream_unfinished : there is still some data left into the DStream.
-BIT_DStream_endOfBuffer : Dstream reached end of buffer. Its container may no longer be completely filled.
-BIT_DStream_completed : Dstream reached its exact end, corresponding in general to decompression completed.
-BIT_DStream_tooFar : Dstream went too far. Decompression result is corrupted.
-
-When reaching end of buffer (BIT_DStream_endOfBuffer), progress slowly, notably if you decode multiple symbols per loop,
-to properly detect the exact end of stream.
-After each decoded symbol, check if DStream is fully consumed using this simple test :
- BIT_reloadDStream(&DStream) >= BIT_DStream_completed
-
-When it's done, verify decompression is fully completed, by checking both DStream and the relevant states.
-Checking if DStream has reached its end is performed by :
- BIT_endOfDStream(&DStream);
-Check also the states. There might be some symbols left there, if some high probability ones (>50%) are possible.
- FSE_endOfDState(&DState);
-*/
-
-
-/******************************************
-* FSE unsafe API
-******************************************/
-static unsigned char FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD);
-/* faster, but works only if nbBits is always >= 1 (otherwise, result will be corrupted) */
-
-
-/******************************************
-* Implementation of inline functions
-******************************************/
-
-/* decompression */
-
-typedef struct {
- U16 tableLog;
- U16 fastMode;
-} FSE_DTableHeader; /* sizeof U32 */
-
-typedef struct
-{
- unsigned short newState;
- unsigned char symbol;
- unsigned char nbBits;
-} FSE_decode_t; /* size == U32 */
-
-MEM_STATIC void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt)
-{
- FSE_DTableHeader DTableH;
- memcpy(&DTableH, dt, sizeof(DTableH));
- DStatePtr->state = BIT_readBits(bitD, DTableH.tableLog);
- BIT_reloadDStream(bitD);
- DStatePtr->table = dt + 1;
-}
-
-MEM_STATIC BYTE FSE_decodeSymbol(FSE_DState_t* DStatePtr, BIT_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 = BIT_readBits(bitD, nbBits);
-
- DStatePtr->state = DInfo.newState + lowBits;
- return symbol;
-}
-
-MEM_STATIC BYTE FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_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 = BIT_readBitsFast(bitD, nbBits);
-
- DStatePtr->state = DInfo.newState + lowBits;
- return symbol;
-}
-
-MEM_STATIC unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr)
-{
- return DStatePtr->state == 0;
-}
-
-
-#if defined (__cplusplus)
-}
-#endif
-/* ******************************************************************
- Huff0 : Huffman coder, part of New Generation Entropy library
- 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
-****************************************************************** */
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-/******************************************
-* Static allocation macros
-******************************************/
-/* Huff0 buffer bounds */
-#define HUF_CTABLEBOUND 129
-#define HUF_BLOCKBOUND(size) (size + (size>>8) + 8) /* only true if incompressible pre-filtered with fast heuristic */
-#define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
-
-/* static allocation of Huff0's DTable */
-#define HUF_DTABLE_SIZE(maxTableLog) (1 + (1<<maxTableLog)) /* nb Cells; use unsigned short for X2, unsigned int for X4 */
-#define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \
- unsigned short DTable[HUF_DTABLE_SIZE(maxTableLog)] = { maxTableLog }
-#define HUF_CREATE_STATIC_DTABLEX4(DTable, maxTableLog) \
- unsigned int DTable[HUF_DTABLE_SIZE(maxTableLog)] = { maxTableLog }
-#define HUF_CREATE_STATIC_DTABLEX6(DTable, maxTableLog) \
- unsigned int DTable[HUF_DTABLE_SIZE(maxTableLog) * 3 / 2] = { maxTableLog }
-
-
-/******************************************
-* Advanced functions
-******************************************/
-static size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */
-static size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbols decoder */
-
-
-#if defined (__cplusplus)
-}
-#endif
-
-/*
- zstd - standard compression library
- Header File
- 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
-*/
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-/* *************************************
-* Includes
-***************************************/
-#include <stddef.h> /* size_t */
-
-
-/* *************************************
-* Version
-***************************************/
-#define ZSTD_VERSION_MAJOR 0 /* for breaking interface changes */
-#define ZSTD_VERSION_MINOR 2 /* for new (non-breaking) interface capabilities */
-#define ZSTD_VERSION_RELEASE 2 /* for tweaks, bug-fixes, or development */
-#define ZSTD_VERSION_NUMBER (ZSTD_VERSION_MAJOR *100*100 + ZSTD_VERSION_MINOR *100 + ZSTD_VERSION_RELEASE)
-
-
-/* *************************************
-* Advanced functions
-***************************************/
-typedef struct ZSTD_CCtx_s ZSTD_CCtx; /* incomplete type */
-
-#if defined (__cplusplus)
-}
-#endif
-/*
- zstd - standard compression library
- Header File for static linking only
- 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
-*/
-
-/* 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.
- */
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-/* *************************************
-* Streaming functions
-***************************************/
-
-typedef struct ZSTD_DCtx_s ZSTD_DCtx;
-
-/*
- Use above functions alternatively.
- ZSTD_nextSrcSizeToDecompress() tells how much bytes to provide as 'srcSize' to ZSTD_decompressContinue().
- ZSTD_decompressContinue() will use previous data blocks to improve compression if they are located prior to current block.
- Result is the number of bytes regenerated within 'dst'.
- It can be zero, which is not an error; it just means ZSTD_decompressContinue() has decoded some header.
-*/
-
-/* *************************************
-* Prefix - version detection
-***************************************/
-#define ZSTD_magicNumber 0xFD2FB523 /* v0.3 */
-
-
-#if defined (__cplusplus)
-}
-#endif
-/* ******************************************************************
- FSE : 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 :
- - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy
- - Public forum : https://groups.google.com/forum/#!forum/lz4c
-****************************************************************** */
-
-#ifndef FSE_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 FSE_MAX_MEMORY_USAGE 14
-#define FSE_DEFAULT_MEMORY_USAGE 13
-
-/* FSE_MAX_SYMBOL_VALUE :
-* Maximum symbol value authorized.
-* Required for proper stack allocation */
-#define FSE_MAX_SYMBOL_VALUE 255
-
-
-/****************************************************************
-* template functions type & suffix
-****************************************************************/
-#define FSE_FUNCTION_TYPE BYTE
-#define FSE_FUNCTION_EXTENSION
-
-
-/****************************************************************
-* Byte symbol type
-****************************************************************/
-#endif /* !FSE_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
-# ifdef __GNUC__
-# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
-# define FORCE_INLINE static inline __attribute__((always_inline))
-# else
-# define FORCE_INLINE static inline
-# endif
-#endif
-
-
-/****************************************************************
-* Includes
-****************************************************************/
-#include <stdlib.h> /* malloc, free, qsort */
-#include <string.h> /* memcpy, memset */
-#include <stdio.h> /* printf (debug) */
-
-/****************************************************************
-* Constants
-*****************************************************************/
-#define FSE_MAX_TABLELOG (FSE_MAX_MEMORY_USAGE-2)
-#define FSE_MAX_TABLESIZE (1U<<FSE_MAX_TABLELOG)
-#define FSE_MAXTABLESIZE_MASK (FSE_MAX_TABLESIZE-1)
-#define FSE_DEFAULT_TABLELOG (FSE_DEFAULT_MEMORY_USAGE-2)
-#define FSE_MIN_TABLELOG 5
-
-#define FSE_TABLELOG_ABSOLUTE_MAX 15
-#if FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX
-#error "FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX is not supported"
-#endif
-
-
-/****************************************************************
-* Error Management
-****************************************************************/
-#define FSE_STATIC_ASSERT(c) { enum { FSE_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */
-
-
-/****************************************************************
-* Complex types
-****************************************************************/
-typedef U32 DTable_max_t[FSE_DTABLE_SIZE_U32(FSE_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 FSE_FUNCTION_EXTENSION
-# error "FSE_FUNCTION_EXTENSION must be defined"
-#endif
-#ifndef FSE_FUNCTION_TYPE
-# error "FSE_FUNCTION_TYPE must be defined"
-#endif
-
-/* Function names */
-#define FSE_CAT(X,Y) X##Y
-#define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y)
-#define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y)
-
-
-/* Function templates */
-
+/* ******************************************************************
+ Error codes and messages
+ 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 ERROR_H_MODULE
+#define ERROR_H_MODULE
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+#include <stddef.h> /* size_t, ptrdiff_t */
+#include "zstd_v03.h"
+
+/******************************************
+* Compiler-specific
+******************************************/
+#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
+# define ERR_STATIC static inline
+#elif defined(_MSC_VER)
+# define ERR_STATIC static __inline
+#elif defined(__GNUC__)
+# define ERR_STATIC static __attribute__((unused))
+#else
+# define ERR_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */
+#endif
+
+
+/******************************************
+* Error Management
+******************************************/
+#define PREFIX(name) ZSTD_error_##name
+
+#define ERROR(name) (size_t)-PREFIX(name)
+
+#define ERROR_LIST(ITEM) \
+ ITEM(PREFIX(No_Error)) ITEM(PREFIX(GENERIC)) \
+ ITEM(PREFIX(memory_allocation)) \
+ ITEM(PREFIX(dstSize_tooSmall)) ITEM(PREFIX(srcSize_wrong)) \
+ ITEM(PREFIX(prefix_unknown)) ITEM(PREFIX(corruption_detected)) \
+ ITEM(PREFIX(tableLog_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooSmall)) \
+ ITEM(PREFIX(maxCode))
+
+#define ERROR_GENERATE_ENUM(ENUM) ENUM,
+typedef enum { ERROR_LIST(ERROR_GENERATE_ENUM) } ERR_codes; /* enum is exposed, to detect & handle specific errors; compare function result to -enum value */
+
+#define ERROR_CONVERTTOSTRING(STRING) #STRING,
+#define ERROR_GENERATE_STRING(EXPR) ERROR_CONVERTTOSTRING(EXPR)
+
+ERR_STATIC unsigned ERR_isError(size_t code) { return (code > ERROR(maxCode)); }
+
+
+#if defined (__cplusplus)
+}
+#endif
+
+#endif /* ERROR_H_MODULE */
+
+
+/* ******************************************************************
+ 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 :
+ - FSE 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
+
+/******************************************
+* Includes
+******************************************/
+#include <stddef.h> /* size_t, ptrdiff_t */
+#include <string.h> /* memcpy */
+
+
+/******************************************
+* Compiler-specific
+******************************************/
+#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 generating assembly depending on alignment.
+ * But 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(__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 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; } __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 void MEM_writeLE32(void* memPtr, U32 val32)
+{
+ if (MEM_isLittleEndian())
+ {
+ MEM_write32(memPtr, val32);
+ }
+ else
+ {
+ BYTE* p = (BYTE*)memPtr;
+ p[0] = (BYTE)val32;
+ p[1] = (BYTE)(val32>>8);
+ p[2] = (BYTE)(val32>>16);
+ p[3] = (BYTE)(val32>>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 void MEM_writeLE64(void* memPtr, U64 val64)
+{
+ if (MEM_isLittleEndian())
+ {
+ MEM_write64(memPtr, val64);
+ }
+ else
+ {
+ BYTE* p = (BYTE*)memPtr;
+ p[0] = (BYTE)val64;
+ p[1] = (BYTE)(val64>>8);
+ p[2] = (BYTE)(val64>>16);
+ p[3] = (BYTE)(val64>>24);
+ p[4] = (BYTE)(val64>>32);
+ p[5] = (BYTE)(val64>>40);
+ p[6] = (BYTE)(val64>>48);
+ p[7] = (BYTE)(val64>>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);
+}
+
+MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val)
+{
+ if (MEM_32bits())
+ MEM_writeLE32(memPtr, (U32)val);
+ else
+ MEM_writeLE64(memPtr, (U64)val);
+}
+
+#if defined (__cplusplus)
+}
+#endif
+
+#endif /* MEM_H_MODULE */
+
+
+/* ******************************************************************
+ bitstream
+ Part of NewGen Entropy library
+ header file (to include)
+ 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 BITSTREAM_H_MODULE
+#define BITSTREAM_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 decompression API (read backward)
+**********************************************/
+typedef struct
+{
+ size_t bitContainer;
+ unsigned bitsConsumed;
+ const char* ptr;
+ const char* start;
+} BIT_DStream_t;
+
+typedef enum { BIT_DStream_unfinished = 0,
+ BIT_DStream_endOfBuffer = 1,
+ BIT_DStream_completed = 2,
+ BIT_DStream_overflow = 3 } BIT_DStream_status; /* result of BIT_reloadDStream() */
+ /* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */
+
+MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize);
+MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, unsigned nbBits);
+MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD);
+MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* bitD);
+
+
+/*
+* Start by invoking BIT_initDStream().
+* A chunk of the bitStream is then stored into a local register.
+* Local register size is 64-bits on 64-bits systems, 32-bits on 32-bits systems (size_t).
+* You can then retrieve bitFields stored into the local register, **in reverse order**.
+* Local register is manually filled from memory by the BIT_reloadDStream() method.
+* A reload guarantee a minimum of ((8*sizeof(size_t))-7) bits when its result is BIT_DStream_unfinished.
+* Otherwise, it can be less than that, so proceed accordingly.
+* Checking if DStream has reached its end can be performed with BIT_endOfDStream()
+*/
+
+
+/******************************************
+* unsafe API
+******************************************/
+MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, unsigned nbBits);
+/* faster, but works only if nbBits >= 1 */
+
+
+
+/****************************************************************
+* Helper functions
+****************************************************************/
+MEM_STATIC unsigned BIT_highbit32 (register 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
+**********************************************************/
+
+/*!BIT_initDStream
+* Initialize a BIT_DStream_t.
+* @bitD : a pointer to an already allocated BIT_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 BIT_initDStream(BIT_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 - BIT_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 ERROR(GENERIC); /* endMark not present */
+ bitD->bitsConsumed = 8 - BIT_highbit32(contain32);
+ bitD->bitsConsumed += (U32)(sizeof(size_t) - srcSize)*8;
+ }
+
+ return srcSize;
+}
+
+/*!BIT_lookBits
+ * Provides next n bits from local register
+ * local register is not modified (bits are still present for next read/look)
+ * On 32-bits, maxNbBits==25
+ * On 64-bits, maxNbBits==57
+ * @return : value extracted
+ */
+MEM_STATIC size_t BIT_lookBits(BIT_DStream_t* bitD, U32 nbBits)
+{
+ const U32 bitMask = sizeof(bitD->bitContainer)*8 - 1;
+ return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask);
+}
+
+/*! BIT_lookBitsFast :
+* unsafe version; only works only if nbBits >= 1 */
+MEM_STATIC size_t BIT_lookBitsFast(BIT_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 BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits)
+{
+ bitD->bitsConsumed += nbBits;
+}
+
+/*!BIT_readBits
+ * Read next n bits from local register.
+ * pay attention to not read more than nbBits contained into local register.
+ * @return : extracted value.
+ */
+MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, U32 nbBits)
+{
+ size_t value = BIT_lookBits(bitD, nbBits);
+ BIT_skipBits(bitD, nbBits);
+ return value;
+}
+
+/*!BIT_readBitsFast :
+* unsafe version; only works only if nbBits >= 1 */
+MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, U32 nbBits)
+{
+ size_t value = BIT_lookBitsFast(bitD, nbBits);
+ BIT_skipBits(bitD, nbBits);
+ return value;
+}
+
+MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD)
+{
+ if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should never happen */
+ return BIT_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 BIT_DStream_unfinished;
+ }
+ if (bitD->ptr == bitD->start)
+ {
+ if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return BIT_DStream_endOfBuffer;
+ return BIT_DStream_completed;
+ }
+ {
+ U32 nbBytes = bitD->bitsConsumed >> 3;
+ BIT_DStream_status result = BIT_DStream_unfinished;
+ if (bitD->ptr - nbBytes < bitD->start)
+ {
+ nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */
+ result = BIT_DStream_endOfBuffer;
+ }
+ bitD->ptr -= nbBytes;
+ bitD->bitsConsumed -= nbBytes*8;
+ bitD->bitContainer = MEM_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */
+ return result;
+ }
+}
+
+/*! BIT_endOfDStream
+* @return Tells if DStream has reached its exact end
+*/
+MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* DStream)
+{
+ return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer)*8));
+}
+
+#if defined (__cplusplus)
+}
+#endif
+
+#endif /* BITSTREAM_H_MODULE */
+/* ******************************************************************
+ Error codes and messages
+ 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 ERROR_H_MODULE
+#define ERROR_H_MODULE
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+
+/******************************************
+* Compiler-specific
+******************************************/
+#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
+# define ERR_STATIC static inline
+#elif defined(_MSC_VER)
+# define ERR_STATIC static __inline
+#elif defined(__GNUC__)
+# define ERR_STATIC static __attribute__((unused))
+#else
+# define ERR_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */
+#endif
+
+
+/******************************************
+* Error Management
+******************************************/
+#define PREFIX(name) ZSTD_error_##name
+
+#define ERROR(name) (size_t)-PREFIX(name)
+
+#define ERROR_LIST(ITEM) \
+ ITEM(PREFIX(No_Error)) ITEM(PREFIX(GENERIC)) \
+ ITEM(PREFIX(dstSize_tooSmall)) ITEM(PREFIX(srcSize_wrong)) \
+ ITEM(PREFIX(prefix_unknown)) ITEM(PREFIX(corruption_detected)) \
+ ITEM(PREFIX(tableLog_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooLarge)) ITEM(PREFIX(maxSymbolValue_tooSmall)) \
+ ITEM(PREFIX(maxCode))
+
+#define ERROR_GENERATE_ENUM(ENUM) ENUM,
+typedef enum { ERROR_LIST(ERROR_GENERATE_ENUM) } ERR_codes; /* enum is exposed, to detect & handle specific errors; compare function result to -enum value */
+
+#define ERROR_CONVERTTOSTRING(STRING) #STRING,
+#define ERROR_GENERATE_STRING(EXPR) ERROR_CONVERTTOSTRING(EXPR)
+static const char* ERR_strings[] = { ERROR_LIST(ERROR_GENERATE_STRING) };
+
+ERR_STATIC unsigned ERR_isError(size_t code) { return (code > ERROR(maxCode)); }
+
+ERR_STATIC const char* ERR_getErrorName(size_t code)
+{
+ static const char* codeError = "Unspecified error code";
+ if (ERR_isError(code)) return ERR_strings[-(int)(code)];
+ return codeError;
+}
+
+
+#if defined (__cplusplus)
+}
+#endif
+
+#endif /* ERROR_H_MODULE */
+/*
+Constructor and Destructor of type FSE_CTable
+ Note that its size depends on 'tableLog' and 'maxSymbolValue' */
+typedef unsigned FSE_CTable; /* don't allocate that. It's just a way to be more restrictive than void* */
+typedef unsigned FSE_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */
+
+
+/* ******************************************************************
+ FSE : 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
+****************************************************************** */
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+
+/******************************************
+* Static allocation
+******************************************/
+/* FSE buffer bounds */
+#define FSE_NCOUNTBOUND 512
+#define FSE_BLOCKBOUND(size) (size + (size>>7))
+#define FSE_COMPRESSBOUND(size) (FSE_NCOUNTBOUND + FSE_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
+
+/* You can statically allocate FSE CTable/DTable as a table of unsigned using below macro */
+#define FSE_CTABLE_SIZE_U32(maxTableLog, maxSymbolValue) (1 + (1<<(maxTableLog-1)) + ((maxSymbolValue+1)*2))
+#define FSE_DTABLE_SIZE_U32(maxTableLog) (1 + (1<<maxTableLog))
+
+
+/******************************************
+* FSE advanced API
+******************************************/
+static size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits);
+/* build a fake FSE_DTable, designed to read an uncompressed bitstream where each symbol uses nbBits */
+
+static size_t FSE_buildDTable_rle (FSE_DTable* dt, unsigned char symbolValue);
+/* build a fake FSE_DTable, designed to always generate the same symbolValue */
+
+
+/******************************************
+* FSE symbol decompression API
+******************************************/
+typedef struct
+{
+ size_t state;
+ const void* table; /* precise table may vary, depending on U16 */
+} FSE_DState_t;
+
+
+static void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt);
+
+static unsigned char FSE_decodeSymbol(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD);
+
+static unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr);
+
+/*
+Let's now decompose FSE_decompress_usingDTable() into its unitary components.
+You will decode FSE-encoded symbols from the bitStream,
+and also any other bitFields you put in, **in reverse order**.
+
+You will need a few variables to track your bitStream. They are :
+
+BIT_DStream_t DStream; // Stream context
+FSE_DState_t DState; // State context. Multiple ones are possible
+FSE_DTable* DTablePtr; // Decoding table, provided by FSE_buildDTable()
+
+The first thing to do is to init the bitStream.
+ errorCode = BIT_initDStream(&DStream, srcBuffer, srcSize);
+
+You should then retrieve your initial state(s)
+(in reverse flushing order if you have several ones) :
+ errorCode = FSE_initDState(&DState, &DStream, DTablePtr);
+
+You can then decode your data, symbol after symbol.
+For information the maximum number of bits read by FSE_decodeSymbol() is 'tableLog'.
+Keep in mind that symbols are decoded in reverse order, like a LIFO stack (last in, first out).
+ unsigned char symbol = FSE_decodeSymbol(&DState, &DStream);
+
+You can retrieve any bitfield you eventually stored into the bitStream (in reverse order)
+Note : maximum allowed nbBits is 25, for 32-bits compatibility
+ size_t bitField = BIT_readBits(&DStream, nbBits);
+
+All above operations only read from local register (which size depends on size_t).
+Refueling the register from memory is manually performed by the reload method.
+ endSignal = FSE_reloadDStream(&DStream);
+
+BIT_reloadDStream() result tells if there is still some more data to read from DStream.
+BIT_DStream_unfinished : there is still some data left into the DStream.
+BIT_DStream_endOfBuffer : Dstream reached end of buffer. Its container may no longer be completely filled.
+BIT_DStream_completed : Dstream reached its exact end, corresponding in general to decompression completed.
+BIT_DStream_tooFar : Dstream went too far. Decompression result is corrupted.
+
+When reaching end of buffer (BIT_DStream_endOfBuffer), progress slowly, notably if you decode multiple symbols per loop,
+to properly detect the exact end of stream.
+After each decoded symbol, check if DStream is fully consumed using this simple test :
+ BIT_reloadDStream(&DStream) >= BIT_DStream_completed
+
+When it's done, verify decompression is fully completed, by checking both DStream and the relevant states.
+Checking if DStream has reached its end is performed by :
+ BIT_endOfDStream(&DStream);
+Check also the states. There might be some symbols left there, if some high probability ones (>50%) are possible.
+ FSE_endOfDState(&DState);
+*/
+
+
+/******************************************
+* FSE unsafe API
+******************************************/
+static unsigned char FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD);
+/* faster, but works only if nbBits is always >= 1 (otherwise, result will be corrupted) */
+
+
+/******************************************
+* Implementation of inline functions
+******************************************/
+
+/* decompression */
+
+typedef struct {
+ U16 tableLog;
+ U16 fastMode;
+} FSE_DTableHeader; /* sizeof U32 */
+
+typedef struct
+{
+ unsigned short newState;
+ unsigned char symbol;
+ unsigned char nbBits;
+} FSE_decode_t; /* size == U32 */
+
+MEM_STATIC void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt)
+{
+ FSE_DTableHeader DTableH;
+ memcpy(&DTableH, dt, sizeof(DTableH));
+ DStatePtr->state = BIT_readBits(bitD, DTableH.tableLog);
+ BIT_reloadDStream(bitD);
+ DStatePtr->table = dt + 1;
+}
+
+MEM_STATIC BYTE FSE_decodeSymbol(FSE_DState_t* DStatePtr, BIT_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 = BIT_readBits(bitD, nbBits);
+
+ DStatePtr->state = DInfo.newState + lowBits;
+ return symbol;
+}
+
+MEM_STATIC BYTE FSE_decodeSymbolFast(FSE_DState_t* DStatePtr, BIT_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 = BIT_readBitsFast(bitD, nbBits);
+
+ DStatePtr->state = DInfo.newState + lowBits;
+ return symbol;
+}
+
+MEM_STATIC unsigned FSE_endOfDState(const FSE_DState_t* DStatePtr)
+{
+ return DStatePtr->state == 0;
+}
+
+
+#if defined (__cplusplus)
+}
+#endif
+/* ******************************************************************
+ Huff0 : Huffman coder, part of New Generation Entropy library
+ 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
+****************************************************************** */
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+/******************************************
+* Static allocation macros
+******************************************/
+/* Huff0 buffer bounds */
+#define HUF_CTABLEBOUND 129
+#define HUF_BLOCKBOUND(size) (size + (size>>8) + 8) /* only true if incompressible pre-filtered with fast heuristic */
+#define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
+
+/* static allocation of Huff0's DTable */
+#define HUF_DTABLE_SIZE(maxTableLog) (1 + (1<<maxTableLog)) /* nb Cells; use unsigned short for X2, unsigned int for X4 */
+#define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \
+ unsigned short DTable[HUF_DTABLE_SIZE(maxTableLog)] = { maxTableLog }
+#define HUF_CREATE_STATIC_DTABLEX4(DTable, maxTableLog) \
+ unsigned int DTable[HUF_DTABLE_SIZE(maxTableLog)] = { maxTableLog }
+#define HUF_CREATE_STATIC_DTABLEX6(DTable, maxTableLog) \
+ unsigned int DTable[HUF_DTABLE_SIZE(maxTableLog) * 3 / 2] = { maxTableLog }
+
+
+/******************************************
+* Advanced functions
+******************************************/
+static size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */
+static size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbols decoder */
+
+
+#if defined (__cplusplus)
+}
+#endif
+
+/*
+ zstd - standard compression library
+ Header File
+ 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
+*/
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+/* *************************************
+* Includes
+***************************************/
+#include <stddef.h> /* size_t */
+
+
+/* *************************************
+* Version
+***************************************/
+#define ZSTD_VERSION_MAJOR 0 /* for breaking interface changes */
+#define ZSTD_VERSION_MINOR 2 /* for new (non-breaking) interface capabilities */
+#define ZSTD_VERSION_RELEASE 2 /* for tweaks, bug-fixes, or development */
+#define ZSTD_VERSION_NUMBER (ZSTD_VERSION_MAJOR *100*100 + ZSTD_VERSION_MINOR *100 + ZSTD_VERSION_RELEASE)
+
+
+/* *************************************
+* Advanced functions
+***************************************/
+typedef struct ZSTD_CCtx_s ZSTD_CCtx; /* incomplete type */
+
+#if defined (__cplusplus)
+}
+#endif
+/*
+ zstd - standard compression library
+ Header File for static linking only
+ 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
+*/
+
+/* 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.
+ */
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+/* *************************************
+* Streaming functions
+***************************************/
+
+typedef struct ZSTD_DCtx_s ZSTD_DCtx;
+
+/*
+ Use above functions alternatively.
+ ZSTD_nextSrcSizeToDecompress() tells how much bytes to provide as 'srcSize' to ZSTD_decompressContinue().
+ ZSTD_decompressContinue() will use previous data blocks to improve compression if they are located prior to current block.
+ Result is the number of bytes regenerated within 'dst'.
+ It can be zero, which is not an error; it just means ZSTD_decompressContinue() has decoded some header.
+*/
+
+/* *************************************
+* Prefix - version detection
+***************************************/
+#define ZSTD_magicNumber 0xFD2FB523 /* v0.3 */
+
+
+#if defined (__cplusplus)
+}
+#endif
+/* ******************************************************************
+ FSE : 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 :
+ - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy
+ - Public forum : https://groups.google.com/forum/#!forum/lz4c
+****************************************************************** */
+
+#ifndef FSE_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 FSE_MAX_MEMORY_USAGE 14
+#define FSE_DEFAULT_MEMORY_USAGE 13
+
+/* FSE_MAX_SYMBOL_VALUE :
+* Maximum symbol value authorized.
+* Required for proper stack allocation */
+#define FSE_MAX_SYMBOL_VALUE 255
+
+
+/****************************************************************
+* template functions type & suffix
+****************************************************************/
+#define FSE_FUNCTION_TYPE BYTE
+#define FSE_FUNCTION_EXTENSION
+
+
+/****************************************************************
+* Byte symbol type
+****************************************************************/
+#endif /* !FSE_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
+# ifdef __GNUC__
+# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+# define FORCE_INLINE static inline __attribute__((always_inline))
+# else
+# define FORCE_INLINE static inline
+# endif
+#endif
+
+
+/****************************************************************
+* Includes
+****************************************************************/
+#include <stdlib.h> /* malloc, free, qsort */
+#include <string.h> /* memcpy, memset */
+#include <stdio.h> /* printf (debug) */
+
+/****************************************************************
+* Constants
+*****************************************************************/
+#define FSE_MAX_TABLELOG (FSE_MAX_MEMORY_USAGE-2)
+#define FSE_MAX_TABLESIZE (1U<<FSE_MAX_TABLELOG)
+#define FSE_MAXTABLESIZE_MASK (FSE_MAX_TABLESIZE-1)
+#define FSE_DEFAULT_TABLELOG (FSE_DEFAULT_MEMORY_USAGE-2)
+#define FSE_MIN_TABLELOG 5
+
+#define FSE_TABLELOG_ABSOLUTE_MAX 15
+#if FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX
+#error "FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX is not supported"
+#endif
+
+
+/****************************************************************
+* Error Management
+****************************************************************/
+#define FSE_STATIC_ASSERT(c) { enum { FSE_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */
+
+
+/****************************************************************
+* Complex types
+****************************************************************/
+typedef U32 DTable_max_t[FSE_DTABLE_SIZE_U32(FSE_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 FSE_FUNCTION_EXTENSION
+# error "FSE_FUNCTION_EXTENSION must be defined"
+#endif
+#ifndef FSE_FUNCTION_TYPE
+# error "FSE_FUNCTION_TYPE must be defined"
+#endif
+
+/* Function names */
+#define FSE_CAT(X,Y) X##Y
+#define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y)
+#define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y)
+
+
+/* Function templates */
+
#define FSE_DECODE_TYPE FSE_decode_t
-
-static U32 FSE_tableStep(U32 tableSize) { return (tableSize>>1) + (tableSize>>3) + 3; }
-
+
+static U32 FSE_tableStep(U32 tableSize) { return (tableSize>>1) + (tableSize>>3) + 3; }
+
static size_t FSE_buildDTable
-(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog)
-{
- void* ptr = dt+1;
- FSE_DTableHeader DTableH;
- FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*)ptr;
- const U32 tableSize = 1 << tableLog;
- const U32 tableMask = tableSize-1;
- const U32 step = FSE_tableStep(tableSize);
- U16 symbolNext[FSE_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 > FSE_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge);
- if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge);
-
- /* Init, lay down lowprob symbols */
- DTableH.tableLog = (U16)tableLog;
- for (s=0; s<=maxSymbolValue; s++)
- {
- if (normalizedCounter[s]==-1)
- {
- tableDecode[highThreshold--].symbol = (FSE_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 = (FSE_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++)
- {
- FSE_FUNCTION_TYPE symbol = (FSE_FUNCTION_TYPE)(tableDecode[i].symbol);
- U16 nextState = symbolNext[symbol]++;
- tableDecode[i].nbBits = (BYTE) (tableLog - BIT_highbit32 ((U32)nextState) );
- tableDecode[i].newState = (U16) ( (nextState << tableDecode[i].nbBits) - tableSize);
- }
- }
-
- DTableH.fastMode = (U16)noLarge;
- memcpy(dt, &DTableH, sizeof(DTableH));
- return 0;
-}
-
-
-#ifndef FSE_COMMONDEFS_ONLY
-/******************************************
-* FSE helper functions
-******************************************/
-static unsigned FSE_isError(size_t code) { return ERR_isError(code); }
-
-
-/****************************************************************
-* FSE NCount encoding-decoding
-****************************************************************/
-static short FSE_abs(short a)
-{
- return a<0 ? -a : a;
-}
-
-static size_t FSE_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) + FSE_MIN_TABLELOG; /* extract tableLog */
- if (nbBits > FSE_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 -= 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 = 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)
-*********************************************************/
-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;
-
- 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;
- 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 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;
-
- BIT_DStream_t bitD;
- FSE_DState_t state1;
- FSE_DState_t state2;
- size_t errorCode;
-
- /* Init */
- errorCode = BIT_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 ( ; (BIT_reloadDStream(&bitD)==BIT_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 */
- BIT_reloadDStream(&bitD);
-
- op[1] = FSE_GETSYMBOL(&state2);
-
- if (FSE_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */
- { if (BIT_reloadDStream(&bitD) > BIT_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 */
- BIT_reloadDStream(&bitD);
-
- op[3] = FSE_GETSYMBOL(&state2);
- }
-
- /* tail */
- /* note : BIT_reloadDStream(&bitD) >= FSE_DStream_partiallyFilled; Ends at exactly BIT_DStream_completed */
- while (1)
- {
- if ( (BIT_reloadDStream(&bitD)>BIT_DStream_completed) || (op==omax) || (BIT_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state1))) )
- break;
-
- *op++ = FSE_GETSYMBOL(&state1);
-
- if ( (BIT_reloadDStream(&bitD)>BIT_DStream_completed) || (op==omax) || (BIT_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state2))) )
- break;
-
- *op++ = FSE_GETSYMBOL(&state2);
- }
-
- /* end ? */
- if (BIT_endOfDStream(&bitD) && FSE_endOfDState(&state1) && FSE_endOfDState(&state2))
- return op-ostart;
-
- if (op==omax) return ERROR(dstSize_tooSmall); /* dst buffer is full, but cSrc unfinished */
-
- return ERROR(corruption_detected);
-}
-
-
-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));
-
- /* 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 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 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);
-}
-
-
-
-#endif /* FSE_COMMONDEFS_ONLY */
-/* ******************************************************************
- 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 :
- - FSE+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 */
-# define FORCE_INLINE static __forceinline
-# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
-#else
-# ifdef __GNUC__
-# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
-# define FORCE_INLINE static inline __attribute__((always_inline))
-# else
-# define FORCE_INLINE static inline
-# endif
-#endif
-
-
-/****************************************************************
-* Includes
-****************************************************************/
-#include <stdlib.h> /* malloc, free, qsort */
-#include <string.h> /* memcpy, memset */
-#include <stdio.h> /* printf (debug) */
-
-/****************************************************************
-* Error Management
-****************************************************************/
-#define HUF_STATIC_ASSERT(c) { enum { HUF_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */
-
-
-/******************************************
-* Helper functions
-******************************************/
-static unsigned HUF_isError(size_t code) { return ERR_isError(code); }
-
-#define HUF_ABSOLUTEMAX_TABLELOG 16 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */
-#define HUF_MAX_TABLELOG 12 /* max configured tableLog (for static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */
-#define HUF_DEFAULT_TABLELOG HUF_MAX_TABLELOG /* tableLog by default, when not specified */
-#define HUF_MAX_SYMBOL_VALUE 255
-#if (HUF_MAX_TABLELOG > HUF_ABSOLUTEMAX_TABLELOG)
-# error "HUF_MAX_TABLELOG is too large !"
-#endif
-
-
-
-/*********************************************************
-* Huff0 : Huffman block decompression
-*********************************************************/
-typedef struct { BYTE byte; BYTE nbBits; } HUF_DEltX2; /* single-symbol decoding */
-
-typedef struct { U16 sequence; BYTE nbBits; BYTE length; } HUF_DEltX4; /* double-symbols decoding */
-
-typedef struct { BYTE symbol; BYTE weight; } sortedSymbol_t;
-
-/*! HUF_readStats
- Read compact Huffman tree, saved by HUF_writeCTable
- @huffWeight : destination buffer
- @return : size read from `src`
-*/
-static size_t HUF_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 = ip[0];
- size_t oSize;
- U32 n;
-
- //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 FSE (normal case) */
- {
- if (iSize+1 > srcSize) return ERROR(srcSize_wrong);
- oSize = FSE_decompress(huffWeight, hwSize-1, ip+1, iSize); /* max (hwSize-1) values decoded, as last one is implied */
- if (FSE_isError(oSize)) return oSize;
- }
-
- /* collect weight stats */
- memset(rankStats, 0, (HUF_ABSOLUTEMAX_TABLELOG + 1) * sizeof(U32));
- weightTotal = 0;
- for (n=0; n<oSize; n++)
- {
- if (huffWeight[n] >= HUF_ABSOLUTEMAX_TABLELOG) return ERROR(corruption_detected);
- rankStats[huffWeight[n]]++;
- weightTotal += (1 << huffWeight[n]) >> 1;
- }
-
- /* get last non-null symbol weight (implied, total must be 2^n) */
- tableLog = BIT_highbit32(weightTotal) + 1;
- if (tableLog > HUF_ABSOLUTEMAX_TABLELOG) return ERROR(corruption_detected);
- {
- U32 total = 1 << tableLog;
- U32 rest = total - weightTotal;
- U32 verif = 1 << BIT_highbit32(rest);
- U32 lastWeight = BIT_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 */
-/**************************/
-
-static size_t HUF_readDTableX2 (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 tableLog = 0;
- const BYTE* ip = (const BYTE*) src;
- size_t iSize = ip[0];
- U32 nbSymbols = 0;
- U32 n;
- U32 nextRankStart;
- void* ptr = DTable+1;
- HUF_DEltX2* const dt = (HUF_DEltX2*)(ptr);
-
- HUF_STATIC_ASSERT(sizeof(HUF_DEltX2) == sizeof(U16)); /* if compilation fails here, assertion is false */
- //memset(huffWeight, 0, sizeof(huffWeight)); /* is not necessary, even though some analyzer complain ... */
-
- iSize = HUF_readStats(huffWeight, HUF_MAX_SYMBOL_VALUE + 1, rankVal, &nbSymbols, &tableLog, src, srcSize);
- if (HUF_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 DTable, as allocated, from used size of DTable, in case of DTable 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;
- HUF_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 HUF_decodeSymbolX2(BIT_DStream_t* Dstream, const HUF_DEltX2* dt, const U32 dtLog)
-{
- const size_t val = BIT_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */
- const BYTE c = dt[val].byte;
- BIT_skipBits(Dstream, dt[val].nbBits);
- return c;
-}
-
-#define HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) \
- *ptr++ = HUF_decodeSymbolX2(DStreamPtr, dt, dtLog)
-
-#define HUF_DECODE_SYMBOLX2_1(ptr, DStreamPtr) \
- if (MEM_64bits() || (HUF_MAX_TABLELOG<=12)) \
- HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr)
-
-#define HUF_DECODE_SYMBOLX2_2(ptr, DStreamPtr) \
- if (MEM_64bits()) \
- HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr)
-
-static inline size_t HUF_decodeStreamX2(BYTE* p, BIT_DStream_t* const bitDPtr, BYTE* const pEnd, const HUF_DEltX2* const dt, const U32 dtLog)
-{
- BYTE* const pStart = p;
-
- /* up to 4 symbols at a time */
- while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-4))
- {
- HUF_DECODE_SYMBOLX2_2(p, bitDPtr);
- HUF_DECODE_SYMBOLX2_1(p, bitDPtr);
- HUF_DECODE_SYMBOLX2_2(p, bitDPtr);
- HUF_DECODE_SYMBOLX2_0(p, bitDPtr);
- }
-
- /* closer to the end */
- while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd))
- HUF_DECODE_SYMBOLX2_0(p, bitDPtr);
-
- /* no more data to retrieve from bitstream, hence no need to reload */
- while (p < pEnd)
- HUF_DECODE_SYMBOLX2_0(p, bitDPtr);
-
- return pEnd-pStart;
-}
-
-
-static size_t HUF_decompress4X2_usingDTable(
- void* dst, size_t dstSize,
- const void* cSrc, size_t cSrcSize,
- const U16* 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* ptr = DTable;
- const HUF_DEltX2* const dt = ((const HUF_DEltX2*)ptr) +1;
- const U32 dtLog = DTable[0];
- size_t errorCode;
-
- /* Init */
- BIT_DStream_t bitD1;
- BIT_DStream_t bitD2;
- BIT_DStream_t bitD3;
- BIT_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 = BIT_initDStream(&bitD1, istart1, length1);
- if (HUF_isError(errorCode)) return errorCode;
- errorCode = BIT_initDStream(&bitD2, istart2, length2);
- if (HUF_isError(errorCode)) return errorCode;
- errorCode = BIT_initDStream(&bitD3, istart3, length3);
- if (HUF_isError(errorCode)) return errorCode;
- errorCode = BIT_initDStream(&bitD4, istart4, length4);
- if (HUF_isError(errorCode)) return errorCode;
-
- /* 16-32 symbols per loop (4-8 symbols per stream) */
- endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4);
- for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; )
- {
- HUF_DECODE_SYMBOLX2_2(op1, &bitD1);
- HUF_DECODE_SYMBOLX2_2(op2, &bitD2);
- HUF_DECODE_SYMBOLX2_2(op3, &bitD3);
- HUF_DECODE_SYMBOLX2_2(op4, &bitD4);
- HUF_DECODE_SYMBOLX2_1(op1, &bitD1);
- HUF_DECODE_SYMBOLX2_1(op2, &bitD2);
- HUF_DECODE_SYMBOLX2_1(op3, &bitD3);
- HUF_DECODE_SYMBOLX2_1(op4, &bitD4);
- HUF_DECODE_SYMBOLX2_2(op1, &bitD1);
- HUF_DECODE_SYMBOLX2_2(op2, &bitD2);
- HUF_DECODE_SYMBOLX2_2(op3, &bitD3);
- HUF_DECODE_SYMBOLX2_2(op4, &bitD4);
- HUF_DECODE_SYMBOLX2_0(op1, &bitD1);
- HUF_DECODE_SYMBOLX2_0(op2, &bitD2);
- HUF_DECODE_SYMBOLX2_0(op3, &bitD3);
- HUF_DECODE_SYMBOLX2_0(op4, &bitD4);
-
- endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_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 */
- HUF_decodeStreamX2(op1, &bitD1, opStart2, dt, dtLog);
- HUF_decodeStreamX2(op2, &bitD2, opStart3, dt, dtLog);
- HUF_decodeStreamX2(op3, &bitD3, opStart4, dt, dtLog);
- HUF_decodeStreamX2(op4, &bitD4, oend, dt, dtLog);
-
- /* check */
- endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4);
- if (!endSignal) return ERROR(corruption_detected);
-
- /* decoded size */
- return dstSize;
- }
-}
-
-
-static size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize)
-{
- HUF_CREATE_STATIC_DTABLEX2(DTable, HUF_MAX_TABLELOG);
- const BYTE* ip = (const BYTE*) cSrc;
- size_t errorCode;
-
- errorCode = HUF_readDTableX2 (DTable, cSrc, cSrcSize);
- if (HUF_isError(errorCode)) return errorCode;
- if (errorCode >= cSrcSize) return ERROR(srcSize_wrong);
- ip += errorCode;
- cSrcSize -= errorCode;
-
- return HUF_decompress4X2_usingDTable (dst, dstSize, ip, cSrcSize, DTable);
-}
-
-
-/***************************/
-/* double-symbols decoding */
-/***************************/
-
-static void HUF_fillDTableX4Level2(HUF_DEltX4* DTable, U32 sizeLog, const U32 consumed,
- const U32* rankValOrigin, const int minWeight,
- const sortedSymbol_t* sortedSymbols, const U32 sortedListSize,
- U32 nbBitsBaseline, U16 baseSeq)
-{
- HUF_DEltX4 DElt;
- U32 rankVal[HUF_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[HUF_ABSOLUTEMAX_TABLELOG][HUF_ABSOLUTEMAX_TABLELOG + 1];
-
-static void HUF_fillDTableX4(HUF_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[HUF_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];
- HUF_fillDTableX4Level2(DTable+start, targetLog-nbBits, nbBits,
- rankValOrigin[nbBits], minWeight,
- sortedList+sortedRank, sortedListSize-sortedRank,
- nbBitsBaseline, symbol);
- }
- else
- {
- U32 i;
- const U32 end = start + length;
- HUF_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;
- }
-}
-
-static size_t HUF_readDTableX4 (U32* DTable, const void* src, size_t srcSize)
-{
- BYTE weightList[HUF_MAX_SYMBOL_VALUE + 1];
- sortedSymbol_t sortedSymbol[HUF_MAX_SYMBOL_VALUE + 1];
- U32 rankStats[HUF_ABSOLUTEMAX_TABLELOG + 1] = { 0 };
- U32 rankStart0[HUF_ABSOLUTEMAX_TABLELOG + 2] = { 0 };
- U32* const rankStart = rankStart0+1;
- rankVal_t rankVal;
- U32 tableLog, maxW, sizeOfSort, nbSymbols;
- const U32 memLog = DTable[0];
- const BYTE* ip = (const BYTE*) src;
- size_t iSize = ip[0];
- void* ptr = DTable;
- HUF_DEltX4* const dt = ((HUF_DEltX4*)ptr) + 1;
-
- HUF_STATIC_ASSERT(sizeof(HUF_DEltX4) == sizeof(U32)); /* if compilation fails here, assertion is false */
- if (memLog > HUF_ABSOLUTEMAX_TABLELOG) return ERROR(tableLog_tooLarge);
- //memset(weightList, 0, sizeof(weightList)); /* is not necessary, even though some analyzer complain ... */
-
- iSize = HUF_readStats(weightList, HUF_MAX_SYMBOL_VALUE + 1, rankStats, &nbSymbols, &tableLog, src, srcSize);
- if (HUF_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--)
- { if (!maxW) return ERROR(GENERIC); } /* necessarily finds a solution before maxW==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;
- }
- }
- }
-
- HUF_fillDTableX4(dt, memLog,
- sortedSymbol, sizeOfSort,
- rankStart0, rankVal, maxW,
- tableLog+1);
-
- return iSize;
-}
-
-
-static U32 HUF_decodeSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog)
-{
- const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */
- memcpy(op, dt+val, 2);
- BIT_skipBits(DStream, dt[val].nbBits);
- return dt[val].length;
-}
-
-static U32 HUF_decodeLastSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog)
-{
- const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */
- memcpy(op, dt+val, 1);
- if (dt[val].length==1) BIT_skipBits(DStream, dt[val].nbBits);
- else
- {
- if (DStream->bitsConsumed < (sizeof(DStream->bitContainer)*8))
- {
- BIT_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 HUF_DECODE_SYMBOLX4_0(ptr, DStreamPtr) \
- ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog)
-
-#define HUF_DECODE_SYMBOLX4_1(ptr, DStreamPtr) \
- if (MEM_64bits() || (HUF_MAX_TABLELOG<=12)) \
- ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog)
-
-#define HUF_DECODE_SYMBOLX4_2(ptr, DStreamPtr) \
- if (MEM_64bits()) \
- ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog)
-
-static inline size_t HUF_decodeStreamX4(BYTE* p, BIT_DStream_t* bitDPtr, BYTE* const pEnd, const HUF_DEltX4* const dt, const U32 dtLog)
-{
- BYTE* const pStart = p;
-
- /* up to 8 symbols at a time */
- while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd-7))
- {
- HUF_DECODE_SYMBOLX4_2(p, bitDPtr);
- HUF_DECODE_SYMBOLX4_1(p, bitDPtr);
- HUF_DECODE_SYMBOLX4_2(p, bitDPtr);
- HUF_DECODE_SYMBOLX4_0(p, bitDPtr);
- }
-
- /* closer to the end */
- while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-2))
- HUF_DECODE_SYMBOLX4_0(p, bitDPtr);
-
- while (p <= pEnd-2)
- HUF_DECODE_SYMBOLX4_0(p, bitDPtr); /* no need to reload : reached the end of DStream */
-
- if (p < pEnd)
- p += HUF_decodeLastSymbolX4(p, bitDPtr, dt, dtLog);
-
- return p-pStart;
-}
-
-
-
-static size_t HUF_decompress4X4_usingDTable(
- void* dst, size_t dstSize,
- const void* cSrc, size_t cSrcSize,
- const U32* 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* ptr = DTable;
- const HUF_DEltX4* const dt = ((const HUF_DEltX4*)ptr) +1;
- const U32 dtLog = DTable[0];
- size_t errorCode;
-
- /* Init */
- BIT_DStream_t bitD1;
- BIT_DStream_t bitD2;
- BIT_DStream_t bitD3;
- BIT_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 = BIT_initDStream(&bitD1, istart1, length1);
- if (HUF_isError(errorCode)) return errorCode;
- errorCode = BIT_initDStream(&bitD2, istart2, length2);
- if (HUF_isError(errorCode)) return errorCode;
- errorCode = BIT_initDStream(&bitD3, istart3, length3);
- if (HUF_isError(errorCode)) return errorCode;
- errorCode = BIT_initDStream(&bitD4, istart4, length4);
- if (HUF_isError(errorCode)) return errorCode;
-
- /* 16-32 symbols per loop (4-8 symbols per stream) */
- endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4);
- for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; )
- {
- HUF_DECODE_SYMBOLX4_2(op1, &bitD1);
- HUF_DECODE_SYMBOLX4_2(op2, &bitD2);
- HUF_DECODE_SYMBOLX4_2(op3, &bitD3);
- HUF_DECODE_SYMBOLX4_2(op4, &bitD4);
- HUF_DECODE_SYMBOLX4_1(op1, &bitD1);
- HUF_DECODE_SYMBOLX4_1(op2, &bitD2);
- HUF_DECODE_SYMBOLX4_1(op3, &bitD3);
- HUF_DECODE_SYMBOLX4_1(op4, &bitD4);
- HUF_DECODE_SYMBOLX4_2(op1, &bitD1);
- HUF_DECODE_SYMBOLX4_2(op2, &bitD2);
- HUF_DECODE_SYMBOLX4_2(op3, &bitD3);
- HUF_DECODE_SYMBOLX4_2(op4, &bitD4);
- HUF_DECODE_SYMBOLX4_0(op1, &bitD1);
- HUF_DECODE_SYMBOLX4_0(op2, &bitD2);
- HUF_DECODE_SYMBOLX4_0(op3, &bitD3);
- HUF_DECODE_SYMBOLX4_0(op4, &bitD4);
-
- endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_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 */
- HUF_decodeStreamX4(op1, &bitD1, opStart2, dt, dtLog);
- HUF_decodeStreamX4(op2, &bitD2, opStart3, dt, dtLog);
- HUF_decodeStreamX4(op3, &bitD3, opStart4, dt, dtLog);
- HUF_decodeStreamX4(op4, &bitD4, oend, dt, dtLog);
-
- /* check */
- endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4);
- if (!endSignal) return ERROR(corruption_detected);
-
- /* decoded size */
- return dstSize;
- }
-}
-
-
-static size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize)
-{
- HUF_CREATE_STATIC_DTABLEX4(DTable, HUF_MAX_TABLELOG);
- const BYTE* ip = (const BYTE*) cSrc;
-
- size_t hSize = HUF_readDTableX4 (DTable, cSrc, cSrcSize);
- if (HUF_isError(hSize)) return hSize;
- if (hSize >= cSrcSize) return ERROR(srcSize_wrong);
- ip += hSize;
- cSrcSize -= hSize;
-
- return HUF_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);
-
-static size_t HUF_decompress (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize)
-{
+(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog)
+{
+ void* ptr = dt+1;
+ FSE_DTableHeader DTableH;
+ FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*)ptr;
+ const U32 tableSize = 1 << tableLog;
+ const U32 tableMask = tableSize-1;
+ const U32 step = FSE_tableStep(tableSize);
+ U16 symbolNext[FSE_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 > FSE_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge);
+ if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge);
+
+ /* Init, lay down lowprob symbols */
+ DTableH.tableLog = (U16)tableLog;
+ for (s=0; s<=maxSymbolValue; s++)
+ {
+ if (normalizedCounter[s]==-1)
+ {
+ tableDecode[highThreshold--].symbol = (FSE_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 = (FSE_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++)
+ {
+ FSE_FUNCTION_TYPE symbol = (FSE_FUNCTION_TYPE)(tableDecode[i].symbol);
+ U16 nextState = symbolNext[symbol]++;
+ tableDecode[i].nbBits = (BYTE) (tableLog - BIT_highbit32 ((U32)nextState) );
+ tableDecode[i].newState = (U16) ( (nextState << tableDecode[i].nbBits) - tableSize);
+ }
+ }
+
+ DTableH.fastMode = (U16)noLarge;
+ memcpy(dt, &DTableH, sizeof(DTableH));
+ return 0;
+}
+
+
+#ifndef FSE_COMMONDEFS_ONLY
+/******************************************
+* FSE helper functions
+******************************************/
+static unsigned FSE_isError(size_t code) { return ERR_isError(code); }
+
+
+/****************************************************************
+* FSE NCount encoding-decoding
+****************************************************************/
+static short FSE_abs(short a)
+{
+ return a<0 ? -a : a;
+}
+
+static size_t FSE_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) + FSE_MIN_TABLELOG; /* extract tableLog */
+ if (nbBits > FSE_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 -= 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 = 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)
+*********************************************************/
+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;
+
+ 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;
+ 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 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;
+
+ BIT_DStream_t bitD;
+ FSE_DState_t state1;
+ FSE_DState_t state2;
+ size_t errorCode;
+
+ /* Init */
+ errorCode = BIT_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 ( ; (BIT_reloadDStream(&bitD)==BIT_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 */
+ BIT_reloadDStream(&bitD);
+
+ op[1] = FSE_GETSYMBOL(&state2);
+
+ if (FSE_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */
+ { if (BIT_reloadDStream(&bitD) > BIT_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 */
+ BIT_reloadDStream(&bitD);
+
+ op[3] = FSE_GETSYMBOL(&state2);
+ }
+
+ /* tail */
+ /* note : BIT_reloadDStream(&bitD) >= FSE_DStream_partiallyFilled; Ends at exactly BIT_DStream_completed */
+ while (1)
+ {
+ if ( (BIT_reloadDStream(&bitD)>BIT_DStream_completed) || (op==omax) || (BIT_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state1))) )
+ break;
+
+ *op++ = FSE_GETSYMBOL(&state1);
+
+ if ( (BIT_reloadDStream(&bitD)>BIT_DStream_completed) || (op==omax) || (BIT_endOfDStream(&bitD) && (fast || FSE_endOfDState(&state2))) )
+ break;
+
+ *op++ = FSE_GETSYMBOL(&state2);
+ }
+
+ /* end ? */
+ if (BIT_endOfDStream(&bitD) && FSE_endOfDState(&state1) && FSE_endOfDState(&state2))
+ return op-ostart;
+
+ if (op==omax) return ERROR(dstSize_tooSmall); /* dst buffer is full, but cSrc unfinished */
+
+ return ERROR(corruption_detected);
+}
+
+
+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));
+
+ /* 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 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 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);
+}
+
+
+
+#endif /* FSE_COMMONDEFS_ONLY */
+/* ******************************************************************
+ 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 :
+ - FSE+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 */
+# define FORCE_INLINE static __forceinline
+# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
+#else
+# ifdef __GNUC__
+# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+# define FORCE_INLINE static inline __attribute__((always_inline))
+# else
+# define FORCE_INLINE static inline
+# endif
+#endif
+
+
+/****************************************************************
+* Includes
+****************************************************************/
+#include <stdlib.h> /* malloc, free, qsort */
+#include <string.h> /* memcpy, memset */
+#include <stdio.h> /* printf (debug) */
+
+/****************************************************************
+* Error Management
+****************************************************************/
+#define HUF_STATIC_ASSERT(c) { enum { HUF_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */
+
+
+/******************************************
+* Helper functions
+******************************************/
+static unsigned HUF_isError(size_t code) { return ERR_isError(code); }
+
+#define HUF_ABSOLUTEMAX_TABLELOG 16 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */
+#define HUF_MAX_TABLELOG 12 /* max configured tableLog (for static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */
+#define HUF_DEFAULT_TABLELOG HUF_MAX_TABLELOG /* tableLog by default, when not specified */
+#define HUF_MAX_SYMBOL_VALUE 255
+#if (HUF_MAX_TABLELOG > HUF_ABSOLUTEMAX_TABLELOG)
+# error "HUF_MAX_TABLELOG is too large !"
+#endif
+
+
+
+/*********************************************************
+* Huff0 : Huffman block decompression
+*********************************************************/
+typedef struct { BYTE byte; BYTE nbBits; } HUF_DEltX2; /* single-symbol decoding */
+
+typedef struct { U16 sequence; BYTE nbBits; BYTE length; } HUF_DEltX4; /* double-symbols decoding */
+
+typedef struct { BYTE symbol; BYTE weight; } sortedSymbol_t;
+
+/*! HUF_readStats
+ Read compact Huffman tree, saved by HUF_writeCTable
+ @huffWeight : destination buffer
+ @return : size read from `src`
+*/
+static size_t HUF_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 = ip[0];
+ size_t oSize;
+ U32 n;
+
+ //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 FSE (normal case) */
+ {
+ if (iSize+1 > srcSize) return ERROR(srcSize_wrong);
+ oSize = FSE_decompress(huffWeight, hwSize-1, ip+1, iSize); /* max (hwSize-1) values decoded, as last one is implied */
+ if (FSE_isError(oSize)) return oSize;
+ }
+
+ /* collect weight stats */
+ memset(rankStats, 0, (HUF_ABSOLUTEMAX_TABLELOG + 1) * sizeof(U32));
+ weightTotal = 0;
+ for (n=0; n<oSize; n++)
+ {
+ if (huffWeight[n] >= HUF_ABSOLUTEMAX_TABLELOG) return ERROR(corruption_detected);
+ rankStats[huffWeight[n]]++;
+ weightTotal += (1 << huffWeight[n]) >> 1;
+ }
+
+ /* get last non-null symbol weight (implied, total must be 2^n) */
+ tableLog = BIT_highbit32(weightTotal) + 1;
+ if (tableLog > HUF_ABSOLUTEMAX_TABLELOG) return ERROR(corruption_detected);
+ {
+ U32 total = 1 << tableLog;
+ U32 rest = total - weightTotal;
+ U32 verif = 1 << BIT_highbit32(rest);
+ U32 lastWeight = BIT_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 */
+/**************************/
+
+static size_t HUF_readDTableX2 (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 tableLog = 0;
+ const BYTE* ip = (const BYTE*) src;
+ size_t iSize = ip[0];
+ U32 nbSymbols = 0;
+ U32 n;
+ U32 nextRankStart;
+ void* ptr = DTable+1;
+ HUF_DEltX2* const dt = (HUF_DEltX2*)(ptr);
+
+ HUF_STATIC_ASSERT(sizeof(HUF_DEltX2) == sizeof(U16)); /* if compilation fails here, assertion is false */
+ //memset(huffWeight, 0, sizeof(huffWeight)); /* is not necessary, even though some analyzer complain ... */
+
+ iSize = HUF_readStats(huffWeight, HUF_MAX_SYMBOL_VALUE + 1, rankVal, &nbSymbols, &tableLog, src, srcSize);
+ if (HUF_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 DTable, as allocated, from used size of DTable, in case of DTable 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;
+ HUF_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 HUF_decodeSymbolX2(BIT_DStream_t* Dstream, const HUF_DEltX2* dt, const U32 dtLog)
+{
+ const size_t val = BIT_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */
+ const BYTE c = dt[val].byte;
+ BIT_skipBits(Dstream, dt[val].nbBits);
+ return c;
+}
+
+#define HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) \
+ *ptr++ = HUF_decodeSymbolX2(DStreamPtr, dt, dtLog)
+
+#define HUF_DECODE_SYMBOLX2_1(ptr, DStreamPtr) \
+ if (MEM_64bits() || (HUF_MAX_TABLELOG<=12)) \
+ HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr)
+
+#define HUF_DECODE_SYMBOLX2_2(ptr, DStreamPtr) \
+ if (MEM_64bits()) \
+ HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr)
+
+static inline size_t HUF_decodeStreamX2(BYTE* p, BIT_DStream_t* const bitDPtr, BYTE* const pEnd, const HUF_DEltX2* const dt, const U32 dtLog)
+{
+ BYTE* const pStart = p;
+
+ /* up to 4 symbols at a time */
+ while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-4))
+ {
+ HUF_DECODE_SYMBOLX2_2(p, bitDPtr);
+ HUF_DECODE_SYMBOLX2_1(p, bitDPtr);
+ HUF_DECODE_SYMBOLX2_2(p, bitDPtr);
+ HUF_DECODE_SYMBOLX2_0(p, bitDPtr);
+ }
+
+ /* closer to the end */
+ while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd))
+ HUF_DECODE_SYMBOLX2_0(p, bitDPtr);
+
+ /* no more data to retrieve from bitstream, hence no need to reload */
+ while (p < pEnd)
+ HUF_DECODE_SYMBOLX2_0(p, bitDPtr);
+
+ return pEnd-pStart;
+}
+
+
+static size_t HUF_decompress4X2_usingDTable(
+ void* dst, size_t dstSize,
+ const void* cSrc, size_t cSrcSize,
+ const U16* 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* ptr = DTable;
+ const HUF_DEltX2* const dt = ((const HUF_DEltX2*)ptr) +1;
+ const U32 dtLog = DTable[0];
+ size_t errorCode;
+
+ /* Init */
+ BIT_DStream_t bitD1;
+ BIT_DStream_t bitD2;
+ BIT_DStream_t bitD3;
+ BIT_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 = BIT_initDStream(&bitD1, istart1, length1);
+ if (HUF_isError(errorCode)) return errorCode;
+ errorCode = BIT_initDStream(&bitD2, istart2, length2);
+ if (HUF_isError(errorCode)) return errorCode;
+ errorCode = BIT_initDStream(&bitD3, istart3, length3);
+ if (HUF_isError(errorCode)) return errorCode;
+ errorCode = BIT_initDStream(&bitD4, istart4, length4);
+ if (HUF_isError(errorCode)) return errorCode;
+
+ /* 16-32 symbols per loop (4-8 symbols per stream) */
+ endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4);
+ for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; )
+ {
+ HUF_DECODE_SYMBOLX2_2(op1, &bitD1);
+ HUF_DECODE_SYMBOLX2_2(op2, &bitD2);
+ HUF_DECODE_SYMBOLX2_2(op3, &bitD3);
+ HUF_DECODE_SYMBOLX2_2(op4, &bitD4);
+ HUF_DECODE_SYMBOLX2_1(op1, &bitD1);
+ HUF_DECODE_SYMBOLX2_1(op2, &bitD2);
+ HUF_DECODE_SYMBOLX2_1(op3, &bitD3);
+ HUF_DECODE_SYMBOLX2_1(op4, &bitD4);
+ HUF_DECODE_SYMBOLX2_2(op1, &bitD1);
+ HUF_DECODE_SYMBOLX2_2(op2, &bitD2);
+ HUF_DECODE_SYMBOLX2_2(op3, &bitD3);
+ HUF_DECODE_SYMBOLX2_2(op4, &bitD4);
+ HUF_DECODE_SYMBOLX2_0(op1, &bitD1);
+ HUF_DECODE_SYMBOLX2_0(op2, &bitD2);
+ HUF_DECODE_SYMBOLX2_0(op3, &bitD3);
+ HUF_DECODE_SYMBOLX2_0(op4, &bitD4);
+
+ endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_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 */
+ HUF_decodeStreamX2(op1, &bitD1, opStart2, dt, dtLog);
+ HUF_decodeStreamX2(op2, &bitD2, opStart3, dt, dtLog);
+ HUF_decodeStreamX2(op3, &bitD3, opStart4, dt, dtLog);
+ HUF_decodeStreamX2(op4, &bitD4, oend, dt, dtLog);
+
+ /* check */
+ endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4);
+ if (!endSignal) return ERROR(corruption_detected);
+
+ /* decoded size */
+ return dstSize;
+ }
+}
+
+
+static size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize)
+{
+ HUF_CREATE_STATIC_DTABLEX2(DTable, HUF_MAX_TABLELOG);
+ const BYTE* ip = (const BYTE*) cSrc;
+ size_t errorCode;
+
+ errorCode = HUF_readDTableX2 (DTable, cSrc, cSrcSize);
+ if (HUF_isError(errorCode)) return errorCode;
+ if (errorCode >= cSrcSize) return ERROR(srcSize_wrong);
+ ip += errorCode;
+ cSrcSize -= errorCode;
+
+ return HUF_decompress4X2_usingDTable (dst, dstSize, ip, cSrcSize, DTable);
+}
+
+
+/***************************/
+/* double-symbols decoding */
+/***************************/
+
+static void HUF_fillDTableX4Level2(HUF_DEltX4* DTable, U32 sizeLog, const U32 consumed,
+ const U32* rankValOrigin, const int minWeight,
+ const sortedSymbol_t* sortedSymbols, const U32 sortedListSize,
+ U32 nbBitsBaseline, U16 baseSeq)
+{
+ HUF_DEltX4 DElt;
+ U32 rankVal[HUF_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[HUF_ABSOLUTEMAX_TABLELOG][HUF_ABSOLUTEMAX_TABLELOG + 1];
+
+static void HUF_fillDTableX4(HUF_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[HUF_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];
+ HUF_fillDTableX4Level2(DTable+start, targetLog-nbBits, nbBits,
+ rankValOrigin[nbBits], minWeight,
+ sortedList+sortedRank, sortedListSize-sortedRank,
+ nbBitsBaseline, symbol);
+ }
+ else
+ {
+ U32 i;
+ const U32 end = start + length;
+ HUF_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;
+ }
+}
+
+static size_t HUF_readDTableX4 (U32* DTable, const void* src, size_t srcSize)
+{
+ BYTE weightList[HUF_MAX_SYMBOL_VALUE + 1];
+ sortedSymbol_t sortedSymbol[HUF_MAX_SYMBOL_VALUE + 1];
+ U32 rankStats[HUF_ABSOLUTEMAX_TABLELOG + 1] = { 0 };
+ U32 rankStart0[HUF_ABSOLUTEMAX_TABLELOG + 2] = { 0 };
+ U32* const rankStart = rankStart0+1;
+ rankVal_t rankVal;
+ U32 tableLog, maxW, sizeOfSort, nbSymbols;
+ const U32 memLog = DTable[0];
+ const BYTE* ip = (const BYTE*) src;
+ size_t iSize = ip[0];
+ void* ptr = DTable;
+ HUF_DEltX4* const dt = ((HUF_DEltX4*)ptr) + 1;
+
+ HUF_STATIC_ASSERT(sizeof(HUF_DEltX4) == sizeof(U32)); /* if compilation fails here, assertion is false */
+ if (memLog > HUF_ABSOLUTEMAX_TABLELOG) return ERROR(tableLog_tooLarge);
+ //memset(weightList, 0, sizeof(weightList)); /* is not necessary, even though some analyzer complain ... */
+
+ iSize = HUF_readStats(weightList, HUF_MAX_SYMBOL_VALUE + 1, rankStats, &nbSymbols, &tableLog, src, srcSize);
+ if (HUF_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--)
+ { if (!maxW) return ERROR(GENERIC); } /* necessarily finds a solution before maxW==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;
+ }
+ }
+ }
+
+ HUF_fillDTableX4(dt, memLog,
+ sortedSymbol, sizeOfSort,
+ rankStart0, rankVal, maxW,
+ tableLog+1);
+
+ return iSize;
+}
+
+
+static U32 HUF_decodeSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog)
+{
+ const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */
+ memcpy(op, dt+val, 2);
+ BIT_skipBits(DStream, dt[val].nbBits);
+ return dt[val].length;
+}
+
+static U32 HUF_decodeLastSymbolX4(void* op, BIT_DStream_t* DStream, const HUF_DEltX4* dt, const U32 dtLog)
+{
+ const size_t val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */
+ memcpy(op, dt+val, 1);
+ if (dt[val].length==1) BIT_skipBits(DStream, dt[val].nbBits);
+ else
+ {
+ if (DStream->bitsConsumed < (sizeof(DStream->bitContainer)*8))
+ {
+ BIT_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 HUF_DECODE_SYMBOLX4_0(ptr, DStreamPtr) \
+ ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog)
+
+#define HUF_DECODE_SYMBOLX4_1(ptr, DStreamPtr) \
+ if (MEM_64bits() || (HUF_MAX_TABLELOG<=12)) \
+ ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog)
+
+#define HUF_DECODE_SYMBOLX4_2(ptr, DStreamPtr) \
+ if (MEM_64bits()) \
+ ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog)
+
+static inline size_t HUF_decodeStreamX4(BYTE* p, BIT_DStream_t* bitDPtr, BYTE* const pEnd, const HUF_DEltX4* const dt, const U32 dtLog)
+{
+ BYTE* const pStart = p;
+
+ /* up to 8 symbols at a time */
+ while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd-7))
+ {
+ HUF_DECODE_SYMBOLX4_2(p, bitDPtr);
+ HUF_DECODE_SYMBOLX4_1(p, bitDPtr);
+ HUF_DECODE_SYMBOLX4_2(p, bitDPtr);
+ HUF_DECODE_SYMBOLX4_0(p, bitDPtr);
+ }
+
+ /* closer to the end */
+ while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd-2))
+ HUF_DECODE_SYMBOLX4_0(p, bitDPtr);
+
+ while (p <= pEnd-2)
+ HUF_DECODE_SYMBOLX4_0(p, bitDPtr); /* no need to reload : reached the end of DStream */
+
+ if (p < pEnd)
+ p += HUF_decodeLastSymbolX4(p, bitDPtr, dt, dtLog);
+
+ return p-pStart;
+}
+
+
+
+static size_t HUF_decompress4X4_usingDTable(
+ void* dst, size_t dstSize,
+ const void* cSrc, size_t cSrcSize,
+ const U32* 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* ptr = DTable;
+ const HUF_DEltX4* const dt = ((const HUF_DEltX4*)ptr) +1;
+ const U32 dtLog = DTable[0];
+ size_t errorCode;
+
+ /* Init */
+ BIT_DStream_t bitD1;
+ BIT_DStream_t bitD2;
+ BIT_DStream_t bitD3;
+ BIT_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 = BIT_initDStream(&bitD1, istart1, length1);
+ if (HUF_isError(errorCode)) return errorCode;
+ errorCode = BIT_initDStream(&bitD2, istart2, length2);
+ if (HUF_isError(errorCode)) return errorCode;
+ errorCode = BIT_initDStream(&bitD3, istart3, length3);
+ if (HUF_isError(errorCode)) return errorCode;
+ errorCode = BIT_initDStream(&bitD4, istart4, length4);
+ if (HUF_isError(errorCode)) return errorCode;
+
+ /* 16-32 symbols per loop (4-8 symbols per stream) */
+ endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4);
+ for ( ; (endSignal==BIT_DStream_unfinished) && (op4<(oend-7)) ; )
+ {
+ HUF_DECODE_SYMBOLX4_2(op1, &bitD1);
+ HUF_DECODE_SYMBOLX4_2(op2, &bitD2);
+ HUF_DECODE_SYMBOLX4_2(op3, &bitD3);
+ HUF_DECODE_SYMBOLX4_2(op4, &bitD4);
+ HUF_DECODE_SYMBOLX4_1(op1, &bitD1);
+ HUF_DECODE_SYMBOLX4_1(op2, &bitD2);
+ HUF_DECODE_SYMBOLX4_1(op3, &bitD3);
+ HUF_DECODE_SYMBOLX4_1(op4, &bitD4);
+ HUF_DECODE_SYMBOLX4_2(op1, &bitD1);
+ HUF_DECODE_SYMBOLX4_2(op2, &bitD2);
+ HUF_DECODE_SYMBOLX4_2(op3, &bitD3);
+ HUF_DECODE_SYMBOLX4_2(op4, &bitD4);
+ HUF_DECODE_SYMBOLX4_0(op1, &bitD1);
+ HUF_DECODE_SYMBOLX4_0(op2, &bitD2);
+ HUF_DECODE_SYMBOLX4_0(op3, &bitD3);
+ HUF_DECODE_SYMBOLX4_0(op4, &bitD4);
+
+ endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_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 */
+ HUF_decodeStreamX4(op1, &bitD1, opStart2, dt, dtLog);
+ HUF_decodeStreamX4(op2, &bitD2, opStart3, dt, dtLog);
+ HUF_decodeStreamX4(op3, &bitD3, opStart4, dt, dtLog);
+ HUF_decodeStreamX4(op4, &bitD4, oend, dt, dtLog);
+
+ /* check */
+ endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4);
+ if (!endSignal) return ERROR(corruption_detected);
+
+ /* decoded size */
+ return dstSize;
+ }
+}
+
+
+static size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize)
+{
+ HUF_CREATE_STATIC_DTABLEX4(DTable, HUF_MAX_TABLELOG);
+ const BYTE* ip = (const BYTE*) cSrc;
+
+ size_t hSize = HUF_readDTableX4 (DTable, cSrc, cSrcSize);
+ if (HUF_isError(hSize)) return hSize;
+ if (hSize >= cSrcSize) return ERROR(srcSize_wrong);
+ ip += hSize;
+ cSrcSize -= hSize;
+
+ return HUF_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);
+
+static size_t HUF_decompress (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize)
+{
static const decompressionAlgo decompress[3] = { HUF_decompress4X2, HUF_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 */
- if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */
- 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 HUF_decompress4X2(dst, dstSize, cSrc, cSrcSize); /* multi-streams single-symbol decoding */
- //return HUF_decompress4X4(dst, dstSize, cSrc, cSrcSize); /* multi-streams double-symbols decoding */
- //return HUF_decompress4X6(dst, dstSize, cSrc, cSrcSize); /* multi-streams quad-symbols decoding */
-}
-/*
- 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
-
-/*!
- * HEAPMODE :
- * Select how default compression functions will allocate memory for their hash table,
- * in memory stack (0, fastest), or in memory heap (1, requires malloc())
- * Note that compression context is fairly large, as a consequence heap memory is recommended.
- */
-#ifndef ZSTD_HEAPMODE
-# define ZSTD_HEAPMODE 1
-#endif /* ZSTD_HEAPMODE */
-
-/*!
-* LEGACY_SUPPORT :
-* decompressor can decode older formats (starting from Zstd 0.1+)
-*/
-#ifndef ZSTD_LEGACY_SUPPORT
-# define ZSTD_LEGACY_SUPPORT 1
-#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 */
-# define FORCE_INLINE static __forceinline
-# include <intrin.h> /* For Visual 2005 */
-# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
-# pragma warning(disable : 4324) /* disable: C4324: padded structure */
-#else
-# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
-# ifdef __GNUC__
-# define FORCE_INLINE static inline __attribute__((always_inline))
-# else
-# define FORCE_INLINE static inline
-# endif
-#endif
-
-
-/* *******************************************************
-* Constants
-*********************************************************/
-#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 BIT1 2
-#define BIT0 1
-
-#define KB *(1 <<10)
-#define MB *(1 <<20)
-#define GB *(1U<<30)
-
-#define BLOCKSIZE (128 KB) /* define, for static allocation */
-#define MIN_SEQUENCES_SIZE (2 /*seqNb*/ + 2 /*dumps*/ + 3 /*seqTables*/ + 1 /*bitStream*/)
-#define MIN_CBLOCK_SIZE (3 /*litCSize*/ + MIN_SEQUENCES_SIZE)
-#define IS_RAW BIT0
-#define IS_RLE BIT1
-
-#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 31
-#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 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; }
-
-/*! ZSTD_wildcopy : custom version of memcpy(), can copy up to 7-8 bytes too many */
-static void ZSTD_wildcopy(void* dst, const void* src, size_t length)
-{
- const BYTE* ip = (const BYTE*)src;
- BYTE* op = (BYTE*)dst;
- BYTE* const oend = op + length;
- do COPY8(op, ip) while (op < oend);
-}
-
-
-/* **************************************
-* Local structures
-****************************************/
-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;
-
-
-/* *************************************
-* Error Management
-***************************************/
-/*! ZSTD_isError
-* tells if a return value is an error code */
-static unsigned ZSTD_isError(size_t code) { return ERR_isError(code); }
-
-
-/* *************************************
-* Function body to include
-***************************************/
-static size_t ZSTD_read_ARCH(const void* p) { size_t r; memcpy(&r, p, sizeof(r)); return r; }
-
-MEM_STATIC unsigned ZSTD_NbCommonBytes (register size_t val)
-{
- if (MEM_isLittleEndian())
- {
- if (MEM_64bits())
- {
-# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r = 0;
- _BitScanForward64( &r, (U64)val );
- return (int)(r>>3);
-# elif defined(__GNUC__) && (__GNUC__ >= 3) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (__builtin_ctzll((U64)val) >> 3);
-# else
- static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 };
- return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58];
-# endif
- }
- else /* 32 bits */
- {
-# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r;
- _BitScanForward( &r, (U32)val );
- return (int)(r>>3);
-# elif defined(__GNUC__) && (__GNUC__ >= 3) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (__builtin_ctz((U32)val) >> 3);
-# else
- static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 };
- return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
-# endif
- }
- }
- else /* Big Endian CPU */
- {
- if (MEM_32bits())
- {
-# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r = 0;
- _BitScanReverse64( &r, val );
- return (unsigned)(r>>3);
-# elif defined(__GNUC__) && (__GNUC__ >= 3) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (__builtin_clzll(val) >> 3);
-# else
- unsigned r;
- const unsigned n32 = sizeof(size_t)*4; /* calculate this way due to compiler complaining in 32-bits mode */
- if (!(val>>n32)) { r=4; } else { r=0; val>>=n32; }
- if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
- r += (!val);
- return r;
-# endif
- }
- else /* 32 bits */
- {
-# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r = 0;
- _BitScanReverse( &r, (unsigned long)val );
- return (unsigned)(r>>3);
-# elif defined(__GNUC__) && (__GNUC__ >= 3) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (__builtin_clz((U32)val) >> 3);
-# else
- unsigned r;
- if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
- r += (!val);
- return r;
-# endif
- }
- }
-}
-
-
-MEM_STATIC size_t ZSTD_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* pInLimit)
-{
- const BYTE* const pStart = pIn;
-
- while ((pIn<pInLimit-(sizeof(size_t)-1)))
- {
- size_t diff = ZSTD_read_ARCH(pMatch) ^ ZSTD_read_ARCH(pIn);
- if (!diff) { pIn+=sizeof(size_t); pMatch+=sizeof(size_t); continue; }
- pIn += ZSTD_NbCommonBytes(diff);
- return (size_t)(pIn - pStart);
- }
-
- if (MEM_32bits()) if ((pIn<(pInLimit-3)) && (MEM_read32(pMatch) == MEM_read32(pIn))) { pIn+=4; pMatch+=4; }
- if ((pIn<(pInLimit-1)) && (MEM_read16(pMatch) == MEM_read16(pIn))) { pIn+=2; pMatch+=2; }
- if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++;
- return (size_t)(pIn - pStart);
-}
-
-
-/* *************************************************************
-* Decompression section
-***************************************************************/
-struct ZSTD_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;
- const BYTE* litPtr;
- size_t litBufSize;
- size_t litSize;
- BYTE litBuffer[BLOCKSIZE + 8 /* margin for wildcopy */];
-}; /* typedef'd to ZSTD_Dctx within "zstd_static.h" */
-
-
-static size_t ZSTD_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;
-}
-
-
-/** ZSTD_decompressLiterals
- @return : nb of bytes read from src, or an error code*/
-static size_t ZSTD_decompressLiterals(void* dst, size_t* maxDstSizePtr,
- const void* src, size_t srcSize)
-{
- const BYTE* ip = (const BYTE*)src;
-
- const size_t litSize = (MEM_readLE32(src) & 0x1FFFFF) >> 2; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */
- const size_t litCSize = (MEM_readLE32(ip+2) & 0xFFFFFF) >> 5; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */
-
- if (litSize > *maxDstSizePtr) return ERROR(corruption_detected);
- if (litCSize + 5 > srcSize) return ERROR(corruption_detected);
-
- if (HUF_isError(HUF_decompress(dst, litSize, ip+5, litCSize))) return ERROR(corruption_detected);
-
- *maxDstSizePtr = litSize;
- return litCSize + 5;
-}
-
-
-/** ZSTD_decodeLiteralsBlock
- @return : nb of bytes read from src (< srcSize )*/
-static size_t ZSTD_decodeLiteralsBlock(void* ctx,
- const void* src, size_t srcSize)
-{
- ZSTD_DCtx* dctx = (ZSTD_DCtx*)ctx;
- const BYTE* const istart = (const BYTE* const)src;
-
- /* any compressed block with literals segment must be at least this size */
- if (srcSize < MIN_CBLOCK_SIZE) return ERROR(corruption_detected);
-
- switch(*istart & 3)
- {
- default:
- case 0:
- {
- size_t litSize = BLOCKSIZE;
- const size_t readSize = ZSTD_decompressLiterals(dctx->litBuffer, &litSize, src, srcSize);
- dctx->litPtr = dctx->litBuffer;
- dctx->litBufSize = BLOCKSIZE;
- dctx->litSize = litSize;
- return readSize; /* works if it's an error too */
- }
- case IS_RAW:
- {
- const size_t litSize = (MEM_readLE32(istart) & 0xFFFFFF) >> 2; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */
- if (litSize > srcSize-11) /* risk of reading too far with wildcopy */
- {
- if (litSize > srcSize-3) return ERROR(corruption_detected);
- memcpy(dctx->litBuffer, istart, litSize);
- dctx->litPtr = dctx->litBuffer;
- dctx->litBufSize = BLOCKSIZE;
- dctx->litSize = litSize;
- return litSize+3;
- }
- /* direct reference into compressed stream */
- dctx->litPtr = istart+3;
- dctx->litBufSize = srcSize-3;
- dctx->litSize = litSize;
- return litSize+3;
- }
- case IS_RLE:
- {
- const size_t litSize = (MEM_readLE32(istart) & 0xFFFFFF) >> 2; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */
- if (litSize > BLOCKSIZE) return ERROR(corruption_detected);
- memset(dctx->litBuffer, istart[3], litSize);
- dctx->litPtr = dctx->litBuffer;
- dctx->litBufSize = BLOCKSIZE;
- dctx->litSize = litSize;
- return 4;
- }
- }
-}
-
-
-static size_t ZSTD_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 = MEM_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)
- {
- U32 max;
- case bt_rle :
- LLlog = 0;
- FSE_buildDTable_rle(DTableLL, *ip++); break;
- case bt_raw :
- LLlog = LLbits;
- FSE_buildDTable_raw(DTableLL, LLbits); break;
- default :
- 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)
- {
- U32 max;
- 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++ & MaxOff); /* if *ip > MaxOff, data is corrupted */
- break;
- case bt_raw :
- Offlog = Offbits;
- FSE_buildDTable_raw(DTableOffb, Offbits); break;
- default :
- 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)
- {
- U32 max;
- 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 :
- 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 {
- BIT_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++;
- if (add < 255) litLength += add;
- else
- {
- litLength = MEM_readLE32(dumps) & 0xFFFFFF; /* no pb : dumps is always followed by seq tables > 1 byte */
- dumps += 3;
- }
- if (dumps >= de) dumps = de-1; /* late correction, to avoid read overflow (data is now corrupted anyway) */
- }
-
- /* Offset */
- {
- static const size_t offsetPrefix[MaxOff+1] = { /* note : size_t faster than U32 */
- 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, nbBits;
- offsetCode = FSE_decodeSymbol(&(seqState->stateOffb), &(seqState->DStream)); /* <= maxOff, by table construction */
- if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream));
- nbBits = offsetCode - 1;
- if (offsetCode==0) nbBits = 0; /* cmove */
- offset = offsetPrefix[offsetCode] + BIT_readBits(&(seqState->DStream), nbBits);
- if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream));
- if (offsetCode==0) offset = prevOffset; /* cmove */
- }
-
- /* MatchLength */
- matchLength = FSE_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 */
- dumps += 3;
- }
- 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;
-}
-
-
-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;
- BYTE* const oLitEnd = op + sequence.litLength;
- BYTE* const oMatchEnd = op + sequence.litLength + sequence.matchLength; /* risk : address space overflow (32-bits) */
- BYTE* const oend_8 = oend-8;
- const BYTE* const litEnd = *litPtr + sequence.litLength;
-
- /* checks */
- 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-8) return ERROR(corruption_detected); /* overRead beyond lit buffer */
-
- /* copy Literals */
- ZSTD_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 */
- {
- const BYTE* match = op - sequence.offset;
-
- /* check */
- if (sequence.offset > (size_t)op) return ERROR(corruption_detected); /* address space overflow test (this test seems kept by clang optimizer) */
- //if (match > op) return ERROR(corruption_detected); /* address space overflow test (is clang optimizer removing this test ?) */
- if (match < base) return ERROR(corruption_detected);
-
- /* close range match, overlap */
- 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 (oMatchEnd > oend-12)
- {
- if (op < oend_8)
- {
- ZSTD_wildcopy(op, match, oend_8 - op);
- match += oend_8 - op;
- op = oend_8;
- }
- while (op < oMatchEnd) *op++ = *match++;
- }
- else
- {
- ZSTD_wildcopy(op, match, sequence.matchLength-8); /* works even if matchLength < 8 */
- }
- }
-
- return oMatchEnd - ostart;
-}
-
-static size_t ZSTD_decompressSequences(
- void* ctx,
- void* dst, size_t maxDstSize,
- const void* seqStart, size_t seqSize)
-{
- ZSTD_DCtx* dctx = (ZSTD_DCtx*)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 = dctx->litPtr;
- const BYTE* const litMax = litPtr + dctx->litBufSize;
- const BYTE* const litEnd = litPtr + dctx->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 = ZSTD_decodeSeqHeaders(&nbSeq, &dumps, &dumpsLength,
- DTableLL, DTableML, DTableOffb,
- ip, iend-ip);
- if (ZSTD_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 = sequence.offset = 4;
- errorCode = BIT_initDStream(&(seqState.DStream), ip, iend-ip);
- if (ERR_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 ( ; (BIT_reloadDStream(&(seqState.DStream)) <= BIT_DStream_completed) && (nbSeq>0) ; )
- {
- size_t oneSeqSize;
- nbSeq--;
- ZSTD_decodeSequence(&sequence, &seqState);
- oneSeqSize = ZSTD_execSequence(op, sequence, &litPtr, litMax, base, oend);
- if (ZSTD_isError(oneSeqSize)) return oneSeqSize;
- op += oneSeqSize;
- }
-
- /* check if reached exact end */
- if ( !BIT_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 (litPtr > litEnd) return ERROR(corruption_detected);
- 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 */
- const BYTE* ip = (const BYTE*)src;
-
- /* Decode literals sub-block */
- size_t litCSize = ZSTD_decodeLiteralsBlock(ctx, src, srcSize);
- if (ZSTD_isError(litCSize)) return litCSize;
- ip += litCSize;
- srcSize -= litCSize;
-
- return ZSTD_decompressSequences(ctx, dst, maxDstSize, ip, srcSize);
-}
-
-
-static size_t ZSTD_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;
- blockProperties_t blockProperties;
-
- /* Frame Header */
- if (srcSize < ZSTD_frameHeaderSize+ZSTD_blockHeaderSize) return ERROR(srcSize_wrong);
- magicNumber = MEM_readLE32(src);
- if (magicNumber != ZSTD_magicNumber) return ERROR(prefix_unknown);
- ip += ZSTD_frameHeaderSize; remainingSize -= ZSTD_frameHeaderSize;
-
- /* Loop on each block */
- while (1)
- {
- size_t decodedSize=0;
- size_t cBlockSize = ZSTD_getcBlockSize(ip, iend-ip, &blockProperties);
- if (ZSTD_isError(cBlockSize)) return cBlockSize;
-
- ip += ZSTD_blockHeaderSize;
- remainingSize -= ZSTD_blockHeaderSize;
- if (cBlockSize > remainingSize) return ERROR(srcSize_wrong);
-
- switch(blockProperties.blockType)
- {
- case bt_compressed:
- decodedSize = ZSTD_decompressBlock(ctx, op, oend-op, ip, cBlockSize);
- break;
- case bt_raw :
- decodedSize = ZSTD_copyUncompressedBlock(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 (ZSTD_isError(decodedSize)) return decodedSize;
- op += decodedSize;
- ip += cBlockSize;
- remainingSize -= cBlockSize;
- }
-
- return op-ostart;
-}
-
-static size_t ZSTD_decompress(void* dst, size_t maxDstSize, const void* src, size_t srcSize)
-{
- ZSTD_DCtx ctx;
- ctx.base = dst;
- return ZSTD_decompressDCtx(&ctx, dst, maxDstSize, src, srcSize);
-}
-
-
-/*******************************
-* Streaming Decompression API
-*******************************/
-
-static size_t ZSTD_resetDCtx(ZSTD_DCtx* dctx)
-{
- dctx->expected = ZSTD_frameHeaderSize;
- dctx->phase = 0;
- dctx->previousDstEnd = NULL;
- dctx->base = NULL;
- return 0;
-}
-
-static ZSTD_DCtx* ZSTD_createDCtx(void)
-{
- ZSTD_DCtx* dctx = (ZSTD_DCtx*)malloc(sizeof(ZSTD_DCtx));
- if (dctx==NULL) return NULL;
- ZSTD_resetDCtx(dctx);
- return dctx;
-}
-
-static size_t ZSTD_freeDCtx(ZSTD_DCtx* dctx)
-{
- free(dctx);
- return 0;
-}
-
-static size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx* dctx)
-{
- return dctx->expected;
-}
-
-static size_t ZSTD_decompressContinue(ZSTD_DCtx* ctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize)
-{
- /* 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 = MEM_readLE32(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 = ZSTD_getcBlockSize(src, ZSTD_blockHeaderSize, &bp);
- if (ZSTD_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;
- }
-
-}
-
-
-/* wrapper layer */
-
-unsigned ZSTDv03_isError(size_t code)
-{
- return ZSTD_isError(code);
-}
-
-size_t ZSTDv03_decompress( void* dst, size_t maxOriginalSize,
- const void* src, size_t compressedSize)
-{
- return ZSTD_decompress(dst, maxOriginalSize, src, compressedSize);
-}
-
-ZSTDv03_Dctx* ZSTDv03_createDCtx(void)
-{
- return (ZSTDv03_Dctx*)ZSTD_createDCtx();
-}
-
-size_t ZSTDv03_freeDCtx(ZSTDv03_Dctx* dctx)
-{
- return ZSTD_freeDCtx((ZSTD_DCtx*)dctx);
-}
-
-size_t ZSTDv03_resetDCtx(ZSTDv03_Dctx* dctx)
-{
- return ZSTD_resetDCtx((ZSTD_DCtx*)dctx);
-}
-
-size_t ZSTDv03_nextSrcSizeToDecompress(ZSTDv03_Dctx* dctx)
-{
- return ZSTD_nextSrcSizeToDecompress((ZSTD_DCtx*)dctx);
-}
-
-size_t ZSTDv03_decompressContinue(ZSTDv03_Dctx* dctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize)
-{
- return ZSTD_decompressContinue((ZSTD_DCtx*)dctx, dst, maxDstSize, src, srcSize);
-}
+ /* 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 */
+ if (cSrcSize == dstSize) { memcpy(dst, cSrc, dstSize); return dstSize; } /* not compressed */
+ 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 HUF_decompress4X2(dst, dstSize, cSrc, cSrcSize); /* multi-streams single-symbol decoding */
+ //return HUF_decompress4X4(dst, dstSize, cSrc, cSrcSize); /* multi-streams double-symbols decoding */
+ //return HUF_decompress4X6(dst, dstSize, cSrc, cSrcSize); /* multi-streams quad-symbols decoding */
+}
+/*
+ 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
+
+/*!
+ * HEAPMODE :
+ * Select how default compression functions will allocate memory for their hash table,
+ * in memory stack (0, fastest), or in memory heap (1, requires malloc())
+ * Note that compression context is fairly large, as a consequence heap memory is recommended.
+ */
+#ifndef ZSTD_HEAPMODE
+# define ZSTD_HEAPMODE 1
+#endif /* ZSTD_HEAPMODE */
+
+/*!
+* LEGACY_SUPPORT :
+* decompressor can decode older formats (starting from Zstd 0.1+)
+*/
+#ifndef ZSTD_LEGACY_SUPPORT
+# define ZSTD_LEGACY_SUPPORT 1
+#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 */
+# define FORCE_INLINE static __forceinline
+# include <intrin.h> /* For Visual 2005 */
+# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
+# pragma warning(disable : 4324) /* disable: C4324: padded structure */
+#else
+# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+# ifdef __GNUC__
+# define FORCE_INLINE static inline __attribute__((always_inline))
+# else
+# define FORCE_INLINE static inline
+# endif
+#endif
+
+
+/* *******************************************************
+* Constants
+*********************************************************/
+#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 BIT1 2
+#define BIT0 1
+
+#define KB *(1 <<10)
+#define MB *(1 <<20)
+#define GB *(1U<<30)
+
+#define BLOCKSIZE (128 KB) /* define, for static allocation */
+#define MIN_SEQUENCES_SIZE (2 /*seqNb*/ + 2 /*dumps*/ + 3 /*seqTables*/ + 1 /*bitStream*/)
+#define MIN_CBLOCK_SIZE (3 /*litCSize*/ + MIN_SEQUENCES_SIZE)
+#define IS_RAW BIT0
+#define IS_RLE BIT1
+
+#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 31
+#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 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; }
+
+/*! ZSTD_wildcopy : custom version of memcpy(), can copy up to 7-8 bytes too many */
+static void ZSTD_wildcopy(void* dst, const void* src, size_t length)
+{
+ const BYTE* ip = (const BYTE*)src;
+ BYTE* op = (BYTE*)dst;
+ BYTE* const oend = op + length;
+ do COPY8(op, ip) while (op < oend);
+}
+
+
+/* **************************************
+* Local structures
+****************************************/
+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;
+
+
+/* *************************************
+* Error Management
+***************************************/
+/*! ZSTD_isError
+* tells if a return value is an error code */
+static unsigned ZSTD_isError(size_t code) { return ERR_isError(code); }
+
+
+/* *************************************
+* Function body to include
+***************************************/
+static size_t ZSTD_read_ARCH(const void* p) { size_t r; memcpy(&r, p, sizeof(r)); return r; }
+
+MEM_STATIC unsigned ZSTD_NbCommonBytes (register size_t val)
+{
+ if (MEM_isLittleEndian())
+ {
+ if (MEM_64bits())
+ {
+# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r = 0;
+ _BitScanForward64( &r, (U64)val );
+ return (int)(r>>3);
+# elif defined(__GNUC__) && (__GNUC__ >= 3) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_ctzll((U64)val) >> 3);
+# else
+ static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 };
+ return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58];
+# endif
+ }
+ else /* 32 bits */
+ {
+# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r;
+ _BitScanForward( &r, (U32)val );
+ return (int)(r>>3);
+# elif defined(__GNUC__) && (__GNUC__ >= 3) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_ctz((U32)val) >> 3);
+# else
+ static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 };
+ return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
+# endif
+ }
+ }
+ else /* Big Endian CPU */
+ {
+ if (MEM_32bits())
+ {
+# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r = 0;
+ _BitScanReverse64( &r, val );
+ return (unsigned)(r>>3);
+# elif defined(__GNUC__) && (__GNUC__ >= 3) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_clzll(val) >> 3);
+# else
+ unsigned r;
+ const unsigned n32 = sizeof(size_t)*4; /* calculate this way due to compiler complaining in 32-bits mode */
+ if (!(val>>n32)) { r=4; } else { r=0; val>>=n32; }
+ if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
+ r += (!val);
+ return r;
+# endif
+ }
+ else /* 32 bits */
+ {
+# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r = 0;
+ _BitScanReverse( &r, (unsigned long)val );
+ return (unsigned)(r>>3);
+# elif defined(__GNUC__) && (__GNUC__ >= 3) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_clz((U32)val) >> 3);
+# else
+ unsigned r;
+ if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
+ r += (!val);
+ return r;
+# endif
+ }
+ }
+}
+
+
+MEM_STATIC size_t ZSTD_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* pInLimit)
+{
+ const BYTE* const pStart = pIn;
+
+ while ((pIn<pInLimit-(sizeof(size_t)-1)))
+ {
+ size_t diff = ZSTD_read_ARCH(pMatch) ^ ZSTD_read_ARCH(pIn);
+ if (!diff) { pIn+=sizeof(size_t); pMatch+=sizeof(size_t); continue; }
+ pIn += ZSTD_NbCommonBytes(diff);
+ return (size_t)(pIn - pStart);
+ }
+
+ if (MEM_32bits()) if ((pIn<(pInLimit-3)) && (MEM_read32(pMatch) == MEM_read32(pIn))) { pIn+=4; pMatch+=4; }
+ if ((pIn<(pInLimit-1)) && (MEM_read16(pMatch) == MEM_read16(pIn))) { pIn+=2; pMatch+=2; }
+ if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++;
+ return (size_t)(pIn - pStart);
+}
+
+
+/* *************************************************************
+* Decompression section
+***************************************************************/
+struct ZSTD_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;
+ const BYTE* litPtr;
+ size_t litBufSize;
+ size_t litSize;
+ BYTE litBuffer[BLOCKSIZE + 8 /* margin for wildcopy */];
+}; /* typedef'd to ZSTD_Dctx within "zstd_static.h" */
+
+
+static size_t ZSTD_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;
+}
+
+
+/** ZSTD_decompressLiterals
+ @return : nb of bytes read from src, or an error code*/
+static size_t ZSTD_decompressLiterals(void* dst, size_t* maxDstSizePtr,
+ const void* src, size_t srcSize)
+{
+ const BYTE* ip = (const BYTE*)src;
+
+ const size_t litSize = (MEM_readLE32(src) & 0x1FFFFF) >> 2; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */
+ const size_t litCSize = (MEM_readLE32(ip+2) & 0xFFFFFF) >> 5; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */
+
+ if (litSize > *maxDstSizePtr) return ERROR(corruption_detected);
+ if (litCSize + 5 > srcSize) return ERROR(corruption_detected);
+
+ if (HUF_isError(HUF_decompress(dst, litSize, ip+5, litCSize))) return ERROR(corruption_detected);
+
+ *maxDstSizePtr = litSize;
+ return litCSize + 5;
+}
+
+
+/** ZSTD_decodeLiteralsBlock
+ @return : nb of bytes read from src (< srcSize )*/
+static size_t ZSTD_decodeLiteralsBlock(void* ctx,
+ const void* src, size_t srcSize)
+{
+ ZSTD_DCtx* dctx = (ZSTD_DCtx*)ctx;
+ const BYTE* const istart = (const BYTE* const)src;
+
+ /* any compressed block with literals segment must be at least this size */
+ if (srcSize < MIN_CBLOCK_SIZE) return ERROR(corruption_detected);
+
+ switch(*istart & 3)
+ {
+ default:
+ case 0:
+ {
+ size_t litSize = BLOCKSIZE;
+ const size_t readSize = ZSTD_decompressLiterals(dctx->litBuffer, &litSize, src, srcSize);
+ dctx->litPtr = dctx->litBuffer;
+ dctx->litBufSize = BLOCKSIZE;
+ dctx->litSize = litSize;
+ return readSize; /* works if it's an error too */
+ }
+ case IS_RAW:
+ {
+ const size_t litSize = (MEM_readLE32(istart) & 0xFFFFFF) >> 2; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */
+ if (litSize > srcSize-11) /* risk of reading too far with wildcopy */
+ {
+ if (litSize > srcSize-3) return ERROR(corruption_detected);
+ memcpy(dctx->litBuffer, istart, litSize);
+ dctx->litPtr = dctx->litBuffer;
+ dctx->litBufSize = BLOCKSIZE;
+ dctx->litSize = litSize;
+ return litSize+3;
+ }
+ /* direct reference into compressed stream */
+ dctx->litPtr = istart+3;
+ dctx->litBufSize = srcSize-3;
+ dctx->litSize = litSize;
+ return litSize+3;
+ }
+ case IS_RLE:
+ {
+ const size_t litSize = (MEM_readLE32(istart) & 0xFFFFFF) >> 2; /* no buffer issue : srcSize >= MIN_CBLOCK_SIZE */
+ if (litSize > BLOCKSIZE) return ERROR(corruption_detected);
+ memset(dctx->litBuffer, istart[3], litSize);
+ dctx->litPtr = dctx->litBuffer;
+ dctx->litBufSize = BLOCKSIZE;
+ dctx->litSize = litSize;
+ return 4;
+ }
+ }
+}
+
+
+static size_t ZSTD_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 = MEM_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)
+ {
+ U32 max;
+ case bt_rle :
+ LLlog = 0;
+ FSE_buildDTable_rle(DTableLL, *ip++); break;
+ case bt_raw :
+ LLlog = LLbits;
+ FSE_buildDTable_raw(DTableLL, LLbits); break;
+ default :
+ 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)
+ {
+ U32 max;
+ 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++ & MaxOff); /* if *ip > MaxOff, data is corrupted */
+ break;
+ case bt_raw :
+ Offlog = Offbits;
+ FSE_buildDTable_raw(DTableOffb, Offbits); break;
+ default :
+ 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)
+ {
+ U32 max;
+ 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 :
+ 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 {
+ BIT_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++;
+ if (add < 255) litLength += add;
+ else
+ {
+ litLength = MEM_readLE32(dumps) & 0xFFFFFF; /* no pb : dumps is always followed by seq tables > 1 byte */
+ dumps += 3;
+ }
+ if (dumps >= de) dumps = de-1; /* late correction, to avoid read overflow (data is now corrupted anyway) */
+ }
+
+ /* Offset */
+ {
+ static const size_t offsetPrefix[MaxOff+1] = { /* note : size_t faster than U32 */
+ 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, nbBits;
+ offsetCode = FSE_decodeSymbol(&(seqState->stateOffb), &(seqState->DStream)); /* <= maxOff, by table construction */
+ if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream));
+ nbBits = offsetCode - 1;
+ if (offsetCode==0) nbBits = 0; /* cmove */
+ offset = offsetPrefix[offsetCode] + BIT_readBits(&(seqState->DStream), nbBits);
+ if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream));
+ if (offsetCode==0) offset = prevOffset; /* cmove */
+ }
+
+ /* MatchLength */
+ matchLength = FSE_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 */
+ dumps += 3;
+ }
+ 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;
+}
+
+
+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;
+ BYTE* const oLitEnd = op + sequence.litLength;
+ BYTE* const oMatchEnd = op + sequence.litLength + sequence.matchLength; /* risk : address space overflow (32-bits) */
+ BYTE* const oend_8 = oend-8;
+ const BYTE* const litEnd = *litPtr + sequence.litLength;
+
+ /* checks */
+ 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-8) return ERROR(corruption_detected); /* overRead beyond lit buffer */
+
+ /* copy Literals */
+ ZSTD_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 */
+ {
+ const BYTE* match = op - sequence.offset;
+
+ /* check */
+ if (sequence.offset > (size_t)op) return ERROR(corruption_detected); /* address space overflow test (this test seems kept by clang optimizer) */
+ //if (match > op) return ERROR(corruption_detected); /* address space overflow test (is clang optimizer removing this test ?) */
+ if (match < base) return ERROR(corruption_detected);
+
+ /* close range match, overlap */
+ 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 (oMatchEnd > oend-12)
+ {
+ if (op < oend_8)
+ {
+ ZSTD_wildcopy(op, match, oend_8 - op);
+ match += oend_8 - op;
+ op = oend_8;
+ }
+ while (op < oMatchEnd) *op++ = *match++;
+ }
+ else
+ {
+ ZSTD_wildcopy(op, match, sequence.matchLength-8); /* works even if matchLength < 8 */
+ }
+ }
+
+ return oMatchEnd - ostart;
+}
+
+static size_t ZSTD_decompressSequences(
+ void* ctx,
+ void* dst, size_t maxDstSize,
+ const void* seqStart, size_t seqSize)
+{
+ ZSTD_DCtx* dctx = (ZSTD_DCtx*)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 = dctx->litPtr;
+ const BYTE* const litMax = litPtr + dctx->litBufSize;
+ const BYTE* const litEnd = litPtr + dctx->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 = ZSTD_decodeSeqHeaders(&nbSeq, &dumps, &dumpsLength,
+ DTableLL, DTableML, DTableOffb,
+ ip, iend-ip);
+ if (ZSTD_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 = sequence.offset = 4;
+ errorCode = BIT_initDStream(&(seqState.DStream), ip, iend-ip);
+ if (ERR_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 ( ; (BIT_reloadDStream(&(seqState.DStream)) <= BIT_DStream_completed) && (nbSeq>0) ; )
+ {
+ size_t oneSeqSize;
+ nbSeq--;
+ ZSTD_decodeSequence(&sequence, &seqState);
+ oneSeqSize = ZSTD_execSequence(op, sequence, &litPtr, litMax, base, oend);
+ if (ZSTD_isError(oneSeqSize)) return oneSeqSize;
+ op += oneSeqSize;
+ }
+
+ /* check if reached exact end */
+ if ( !BIT_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 (litPtr > litEnd) return ERROR(corruption_detected);
+ 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 */
+ const BYTE* ip = (const BYTE*)src;
+
+ /* Decode literals sub-block */
+ size_t litCSize = ZSTD_decodeLiteralsBlock(ctx, src, srcSize);
+ if (ZSTD_isError(litCSize)) return litCSize;
+ ip += litCSize;
+ srcSize -= litCSize;
+
+ return ZSTD_decompressSequences(ctx, dst, maxDstSize, ip, srcSize);
+}
+
+
+static size_t ZSTD_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;
+ blockProperties_t blockProperties;
+
+ /* Frame Header */
+ if (srcSize < ZSTD_frameHeaderSize+ZSTD_blockHeaderSize) return ERROR(srcSize_wrong);
+ magicNumber = MEM_readLE32(src);
+ if (magicNumber != ZSTD_magicNumber) return ERROR(prefix_unknown);
+ ip += ZSTD_frameHeaderSize; remainingSize -= ZSTD_frameHeaderSize;
+
+ /* Loop on each block */
+ while (1)
+ {
+ size_t decodedSize=0;
+ size_t cBlockSize = ZSTD_getcBlockSize(ip, iend-ip, &blockProperties);
+ if (ZSTD_isError(cBlockSize)) return cBlockSize;
+
+ ip += ZSTD_blockHeaderSize;
+ remainingSize -= ZSTD_blockHeaderSize;
+ if (cBlockSize > remainingSize) return ERROR(srcSize_wrong);
+
+ switch(blockProperties.blockType)
+ {
+ case bt_compressed:
+ decodedSize = ZSTD_decompressBlock(ctx, op, oend-op, ip, cBlockSize);
+ break;
+ case bt_raw :
+ decodedSize = ZSTD_copyUncompressedBlock(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 (ZSTD_isError(decodedSize)) return decodedSize;
+ op += decodedSize;
+ ip += cBlockSize;
+ remainingSize -= cBlockSize;
+ }
+
+ return op-ostart;
+}
+
+static size_t ZSTD_decompress(void* dst, size_t maxDstSize, const void* src, size_t srcSize)
+{
+ ZSTD_DCtx ctx;
+ ctx.base = dst;
+ return ZSTD_decompressDCtx(&ctx, dst, maxDstSize, src, srcSize);
+}
+
+
+/*******************************
+* Streaming Decompression API
+*******************************/
+
+static size_t ZSTD_resetDCtx(ZSTD_DCtx* dctx)
+{
+ dctx->expected = ZSTD_frameHeaderSize;
+ dctx->phase = 0;
+ dctx->previousDstEnd = NULL;
+ dctx->base = NULL;
+ return 0;
+}
+
+static ZSTD_DCtx* ZSTD_createDCtx(void)
+{
+ ZSTD_DCtx* dctx = (ZSTD_DCtx*)malloc(sizeof(ZSTD_DCtx));
+ if (dctx==NULL) return NULL;
+ ZSTD_resetDCtx(dctx);
+ return dctx;
+}
+
+static size_t ZSTD_freeDCtx(ZSTD_DCtx* dctx)
+{
+ free(dctx);
+ return 0;
+}
+
+static size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx* dctx)
+{
+ return dctx->expected;
+}
+
+static size_t ZSTD_decompressContinue(ZSTD_DCtx* ctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize)
+{
+ /* 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 = MEM_readLE32(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 = ZSTD_getcBlockSize(src, ZSTD_blockHeaderSize, &bp);
+ if (ZSTD_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;
+ }
+
+}
+
+
+/* wrapper layer */
+
+unsigned ZSTDv03_isError(size_t code)
+{
+ return ZSTD_isError(code);
+}
+
+size_t ZSTDv03_decompress( void* dst, size_t maxOriginalSize,
+ const void* src, size_t compressedSize)
+{
+ return ZSTD_decompress(dst, maxOriginalSize, src, compressedSize);
+}
+
+ZSTDv03_Dctx* ZSTDv03_createDCtx(void)
+{
+ return (ZSTDv03_Dctx*)ZSTD_createDCtx();
+}
+
+size_t ZSTDv03_freeDCtx(ZSTDv03_Dctx* dctx)
+{
+ return ZSTD_freeDCtx((ZSTD_DCtx*)dctx);
+}
+
+size_t ZSTDv03_resetDCtx(ZSTDv03_Dctx* dctx)
+{
+ return ZSTD_resetDCtx((ZSTD_DCtx*)dctx);
+}
+
+size_t ZSTDv03_nextSrcSizeToDecompress(ZSTDv03_Dctx* dctx)
+{
+ return ZSTD_nextSrcSizeToDecompress((ZSTD_DCtx*)dctx);
+}
+
+size_t ZSTDv03_decompressContinue(ZSTDv03_Dctx* dctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize)
+{
+ return ZSTD_decompressContinue((ZSTD_DCtx*)dctx, dst, maxDstSize, src, srcSize);
+}