From 4afa7ed562410a1170223a7bc06efb3708af6a36 Mon Sep 17 00:00:00 2001 From: Bernhard Schmidt Date: Sun, 4 Mar 2018 22:55:51 +0100 Subject: New upstream version 2.4.5 --- src/compat/compat-lz4.c | 832 +++++++++++++++++++++++------------------------- 1 file changed, 391 insertions(+), 441 deletions(-) (limited to 'src/compat/compat-lz4.c') diff --git a/src/compat/compat-lz4.c b/src/compat/compat-lz4.c index 5855ca1..723157d 100644 --- a/src/compat/compat-lz4.c +++ b/src/compat/compat-lz4.c @@ -1,6 +1,16 @@ +/* This file has been backported by dev-tools/lz4-rebaser.sh + * from upstream lz4 commit 7bb64ff2b69a9f8367de (v1.7.5) + */ +#ifdef HAVE_CONFIG_H +#include "config.h" +#elif defined(_MSC_VER) +#include "config-msvc.h" +#endif + +#ifdef NEED_COMPAT_LZ4 /* LZ4 - Fast LZ compression algorithm - Copyright (C) 2011-2015, Yann Collet. + Copyright (C) 2011-2016, Yann Collet. BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) @@ -28,19 +38,12 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. You can contact the author at : - - LZ4 source repository : https://github.com/Cyan4973/lz4 - - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c + - LZ4 homepage : http://www.lz4.org + - LZ4 source repository : https://github.com/lz4/lz4 */ -#ifdef HAVE_CONFIG_H -#include "config.h" -#elif defined(_MSC_VER) -#include "config-msvc.h" -#endif - -#ifdef NEED_COMPAT_LZ4 -/************************************** +/*-************************************ * Tuning parameters **************************************/ /* @@ -48,7 +51,9 @@ * Select how default compression functions will allocate memory for their hash table, * in memory stack (0:default, fastest), or in memory heap (1:requires malloc()). */ -#define HEAPMODE 0 +#ifndef HEAPMODE +# define HEAPMODE 0 +#endif /* * ACCELERATION_DEFAULT : @@ -57,9 +62,31 @@ #define ACCELERATION_DEFAULT 1 -/************************************** +/*-************************************ * CPU Feature Detection **************************************/ +/* LZ4_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 which generate assembly depending on alignment. + * But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6) + * See https://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details. + * Prefer these methods in priority order (0 > 1 > 2) + */ +#ifndef LZ4_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 LZ4_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 LZ4_FORCE_MEMORY_ACCESS 1 +# endif +#endif + /* * LZ4_FORCE_SW_BITCOUNT * Define this parameter if your target system or compiler does not support hardware bit count @@ -69,13 +96,14 @@ #endif -/************************************** -* Includes +/*-************************************ +* Dependency **************************************/ #include "compat-lz4.h" +/* see also "memory routines" below */ -/************************************** +/*-************************************ * Compiler Options **************************************/ #ifdef _MSC_VER /* Visual Studio */ @@ -84,19 +112,16 @@ # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ # pragma warning(disable : 4293) /* disable: C4293: too large shift (32-bits) */ #else -# if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */ -# if defined(__GNUC__) || defined(__clang__) -# define FORCE_INLINE static inline __attribute__((always_inline)) -# else -# define FORCE_INLINE static inline -# endif +# if defined(__GNUC__) || defined(__clang__) +# define FORCE_INLINE static inline __attribute__((always_inline)) +# elif defined(__cplusplus) || (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +# define FORCE_INLINE static inline # else # define FORCE_INLINE static -# endif /* __STDC_VERSION__ */ +# endif #endif /* _MSC_VER */ -/* LZ4_GCC_VERSION is defined into lz4.h */ -#if (LZ4_GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__) +#if (defined(__GNUC__) && (__GNUC__ >= 3)) || (defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 800)) || defined(__clang__) # define expect(expr,value) (__builtin_expect ((expr),(value)) ) #else # define expect(expr,value) (expr) @@ -106,7 +131,7 @@ #define unlikely(expr) expect((expr) != 0, 0) -/************************************** +/*-************************************ * Memory routines **************************************/ #include /* malloc, calloc, free */ @@ -116,54 +141,100 @@ #define MEM_INIT memset -/************************************** +/*-************************************ * Basic Types **************************************/ -#if defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */ +#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) # include typedef uint8_t BYTE; typedef uint16_t U16; typedef uint32_t U32; typedef int32_t S32; typedef uint64_t U64; + typedef uintptr_t uptrval; #else typedef unsigned char BYTE; typedef unsigned short U16; typedef unsigned int U32; typedef signed int S32; typedef unsigned long long U64; + typedef size_t uptrval; /* generally true, except OpenVMS-64 */ #endif +#if defined(__x86_64__) + typedef U64 reg_t; /* 64-bits in x32 mode */ +#else + typedef size_t reg_t; /* 32-bits in x32 mode */ +#endif -/************************************** +/*-************************************ * Reading and writing into memory **************************************/ -#define STEPSIZE sizeof(size_t) - -static unsigned LZ4_64bits(void) { return sizeof(void*)==8; } - static unsigned LZ4_isLittleEndian(void) { - const union { U32 i; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ + const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ return one.c[0]; } +#if defined(LZ4_FORCE_MEMORY_ACCESS) && (LZ4_FORCE_MEMORY_ACCESS==2) +/* lie to the compiler about data alignment; use with caution */ + +static U16 LZ4_read16(const void* memPtr) { return *(const U16*) memPtr; } +static U32 LZ4_read32(const void* memPtr) { return *(const U32*) memPtr; } +static reg_t LZ4_read_ARCH(const void* memPtr) { return *(const reg_t*) memPtr; } + +static void LZ4_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; } +static void LZ4_write32(void* memPtr, U32 value) { *(U32*)memPtr = value; } + +#elif defined(LZ4_FORCE_MEMORY_ACCESS) && (LZ4_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; reg_t uArch; } __attribute__((packed)) unalign; + +static U16 LZ4_read16(const void* ptr) { return ((const unalign*)ptr)->u16; } +static U32 LZ4_read32(const void* ptr) { return ((const unalign*)ptr)->u32; } +static reg_t LZ4_read_ARCH(const void* ptr) { return ((const unalign*)ptr)->uArch; } + +static void LZ4_write16(void* memPtr, U16 value) { ((unalign*)memPtr)->u16 = value; } +static void LZ4_write32(void* memPtr, U32 value) { ((unalign*)memPtr)->u32 = value; } + +#else /* safe and portable access through memcpy() */ + static U16 LZ4_read16(const void* memPtr) { - U16 val16; - memcpy(&val16, memPtr, 2); - return val16; + U16 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +static U32 LZ4_read32(const void* memPtr) +{ + U32 val; memcpy(&val, memPtr, sizeof(val)); return val; +} + +static reg_t LZ4_read_ARCH(const void* memPtr) +{ + reg_t val; memcpy(&val, memPtr, sizeof(val)); return val; } +static void LZ4_write16(void* memPtr, U16 value) +{ + memcpy(memPtr, &value, sizeof(value)); +} + +static void LZ4_write32(void* memPtr, U32 value) +{ + memcpy(memPtr, &value, sizeof(value)); +} + +#endif /* LZ4_FORCE_MEMORY_ACCESS */ + + static U16 LZ4_readLE16(const void* memPtr) { - if (LZ4_isLittleEndian()) - { + if (LZ4_isLittleEndian()) { return LZ4_read16(memPtr); - } - else - { + } else { const BYTE* p = (const BYTE*)memPtr; return (U16)((U16)p[0] + (p[1]<<8)); } @@ -171,63 +242,39 @@ static U16 LZ4_readLE16(const void* memPtr) static void LZ4_writeLE16(void* memPtr, U16 value) { - if (LZ4_isLittleEndian()) - { - memcpy(memPtr, &value, 2); - } - else - { + if (LZ4_isLittleEndian()) { + LZ4_write16(memPtr, value); + } else { BYTE* p = (BYTE*)memPtr; p[0] = (BYTE) value; p[1] = (BYTE)(value>>8); } } -static U32 LZ4_read32(const void* memPtr) +static void LZ4_copy8(void* dst, const void* src) { - U32 val32; - memcpy(&val32, memPtr, 4); - return val32; + memcpy(dst,src,8); } -static U64 LZ4_read64(const void* memPtr) -{ - U64 val64; - memcpy(&val64, memPtr, 8); - return val64; -} - -static size_t LZ4_read_ARCH(const void* p) -{ - if (LZ4_64bits()) - return (size_t)LZ4_read64(p); - else - return (size_t)LZ4_read32(p); -} - - -static void LZ4_copy4(void* dstPtr, const void* srcPtr) { memcpy(dstPtr, srcPtr, 4); } - -static void LZ4_copy8(void* dstPtr, const void* srcPtr) { memcpy(dstPtr, srcPtr, 8); } - -/* customized version of memcpy, which may overwrite up to 7 bytes beyond dstEnd */ +/* customized variant of memcpy, which can overwrite up to 8 bytes beyond dstEnd */ static void LZ4_wildCopy(void* dstPtr, const void* srcPtr, void* dstEnd) { BYTE* d = (BYTE*)dstPtr; const BYTE* s = (const BYTE*)srcPtr; - BYTE* e = (BYTE*)dstEnd; + BYTE* const e = (BYTE*)dstEnd; + do { LZ4_copy8(d,s); d+=8; s+=8; } while (d>3); -# elif (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT) +# elif (defined(__clang__) || (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 */ - { + } 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(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT) +# elif (defined(__clang__) || (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 (LZ4_64bits()) - { + } else /* Big Endian CPU */ { + if (sizeof(val)==8) { # if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT) unsigned long r = 0; _BitScanReverse64( &r, val ); return (unsigned)(r>>3); -# elif (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT) +# elif (defined(__clang__) || (defined(__GNUC__) && (__GNUC__>=3))) && !defined(LZ4_FORCE_SW_BITCOUNT) return (__builtin_clzll((U64)val) >> 3); # else unsigned r; @@ -300,14 +340,12 @@ static unsigned LZ4_NbCommonBytes (register size_t val) r += (!val); return r; # endif - } - else /* 32 bits */ - { + } 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(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT) +# elif (defined(__clang__) || (defined(__GNUC__) && (__GNUC__>=3))) && !defined(LZ4_FORCE_SW_BITCOUNT) return (__builtin_clz((U32)val) >> 3); # else unsigned r; @@ -319,19 +357,19 @@ static unsigned LZ4_NbCommonBytes (register size_t val) } } +#define STEPSIZE sizeof(reg_t) static unsigned LZ4_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* pInLimit) { const BYTE* const pStart = pIn; - while (likely(pIn compression run slower on incompressible data */ -/************************************** +/*-************************************ * Local Structures and types **************************************/ -typedef struct { - U32 hashTable[HASH_SIZE_U32]; - U32 currentOffset; - U32 initCheck; - const BYTE* dictionary; - BYTE* bufferStart; /* obsolete, used for slideInputBuffer */ - U32 dictSize; -} LZ4_stream_t_internal; - typedef enum { notLimited = 0, limitedOutput = 1 } limitedOutput_directive; typedef enum { byPtr, byU32, byU16 } tableType_t; @@ -372,44 +397,43 @@ typedef enum { endOnOutputSize = 0, endOnInputSize = 1 } endCondition_directive; typedef enum { full = 0, partial = 1 } earlyEnd_directive; -/************************************** +/*-************************************ * Local Utils **************************************/ int LZ4_versionNumber (void) { return LZ4_VERSION_NUMBER; } +const char* LZ4_versionString(void) { return LZ4_VERSION_STRING; } int LZ4_compressBound(int isize) { return LZ4_COMPRESSBOUND(isize); } int LZ4_sizeofState() { return LZ4_STREAMSIZE; } - -/******************************** +/*-****************************** * Compression functions ********************************/ - -static U32 LZ4_hashSequence(U32 sequence, tableType_t const tableType) +static U32 LZ4_hash4(U32 sequence, tableType_t const tableType) { if (tableType == byU16) - return (((sequence) * 2654435761U) >> ((MINMATCH*8)-(LZ4_HASHLOG+1))); + return ((sequence * 2654435761U) >> ((MINMATCH*8)-(LZ4_HASHLOG+1))); else - return (((sequence) * 2654435761U) >> ((MINMATCH*8)-LZ4_HASHLOG)); + return ((sequence * 2654435761U) >> ((MINMATCH*8)-LZ4_HASHLOG)); } -static const U64 prime5bytes = 889523592379ULL; -static U32 LZ4_hashSequence64(size_t sequence, tableType_t const tableType) +static U32 LZ4_hash5(U64 sequence, tableType_t const tableType) { + static const U64 prime5bytes = 889523592379ULL; + static const U64 prime8bytes = 11400714785074694791ULL; const U32 hashLog = (tableType == byU16) ? LZ4_HASHLOG+1 : LZ4_HASHLOG; - const U32 hashMask = (1<> (40 - hashLog)) & hashMask; + if (LZ4_isLittleEndian()) + return (U32)(((sequence << 24) * prime5bytes) >> (64 - hashLog)); + else + return (U32)(((sequence >> 24) * prime8bytes) >> (64 - hashLog)); } -static U32 LZ4_hashSequenceT(size_t sequence, tableType_t const tableType) +FORCE_INLINE U32 LZ4_hashPosition(const void* const p, tableType_t const tableType) { - if (LZ4_64bits()) - return LZ4_hashSequence64(sequence, tableType); - return LZ4_hashSequence((U32)sequence, tableType); + if ((sizeof(reg_t)==8) && (tableType != byU16)) return LZ4_hash5(LZ4_read_ARCH(p), tableType); + return LZ4_hash4(LZ4_read32(p), tableType); } -static U32 LZ4_hashPosition(const void* p, tableType_t tableType) { return LZ4_hashSequenceT(LZ4_read_ARCH(p), tableType); } - static void LZ4_putPositionOnHash(const BYTE* p, U32 h, void* tableBase, tableType_t const tableType, const BYTE* srcBase) { switch (tableType) @@ -420,27 +444,30 @@ static void LZ4_putPositionOnHash(const BYTE* p, U32 h, void* tableBase, tableTy } } -static void LZ4_putPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase) +FORCE_INLINE void LZ4_putPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase) { - U32 h = LZ4_hashPosition(p, tableType); + U32 const h = LZ4_hashPosition(p, tableType); LZ4_putPositionOnHash(p, h, tableBase, tableType, srcBase); } static const BYTE* LZ4_getPositionOnHash(U32 h, void* tableBase, tableType_t tableType, const BYTE* srcBase) { if (tableType == byPtr) { const BYTE** hashTable = (const BYTE**) tableBase; return hashTable[h]; } - if (tableType == byU32) { U32* hashTable = (U32*) tableBase; return hashTable[h] + srcBase; } - { U16* hashTable = (U16*) tableBase; return hashTable[h] + srcBase; } /* default, to ensure a return */ + if (tableType == byU32) { const U32* const hashTable = (U32*) tableBase; return hashTable[h] + srcBase; } + { const U16* const hashTable = (U16*) tableBase; return hashTable[h] + srcBase; } /* default, to ensure a return */ } -static const BYTE* LZ4_getPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase) +FORCE_INLINE const BYTE* LZ4_getPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase) { - U32 h = LZ4_hashPosition(p, tableType); + U32 const h = LZ4_hashPosition(p, tableType); return LZ4_getPositionOnHash(h, tableBase, tableType, srcBase); } + +/** LZ4_compress_generic() : + inlined, to ensure branches are decided at compilation time */ FORCE_INLINE int LZ4_compress_generic( - void* const ctx, + LZ4_stream_t_internal* const cctx, const char* const source, char* const dest, const int inputSize, @@ -451,15 +478,13 @@ FORCE_INLINE int LZ4_compress_generic( const dictIssue_directive dictIssue, const U32 acceleration) { - LZ4_stream_t_internal* const dictPtr = (LZ4_stream_t_internal*)ctx; - const BYTE* ip = (const BYTE*) source; const BYTE* base; const BYTE* lowLimit; - const BYTE* const lowRefLimit = ip - dictPtr->dictSize; - const BYTE* const dictionary = dictPtr->dictionary; - const BYTE* const dictEnd = dictionary + dictPtr->dictSize; - const size_t dictDelta = dictEnd - (const BYTE*)source; + const BYTE* const lowRefLimit = ip - cctx->dictSize; + const BYTE* const dictionary = cctx->dictionary; + const BYTE* const dictEnd = dictionary + cctx->dictSize; + const ptrdiff_t dictDelta = dictEnd - (const BYTE*)source; const BYTE* anchor = (const BYTE*) source; const BYTE* const iend = ip + inputSize; const BYTE* const mflimit = iend - MFLIMIT; @@ -469,10 +494,9 @@ FORCE_INLINE int LZ4_compress_generic( BYTE* const olimit = op + maxOutputSize; U32 forwardH; - size_t refDelta=0; /* Init conditions */ - if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size, too large (or negative) */ + if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported inputSize, too large (or negative) */ switch(dict) { case noDict: @@ -481,11 +505,11 @@ FORCE_INLINE int LZ4_compress_generic( lowLimit = (const BYTE*)source; break; case withPrefix64k: - base = (const BYTE*)source - dictPtr->currentOffset; - lowLimit = (const BYTE*)source - dictPtr->dictSize; + base = (const BYTE*)source - cctx->currentOffset; + lowLimit = (const BYTE*)source - cctx->dictSize; break; case usingExtDict: - base = (const BYTE*)source - dictPtr->currentOffset; + base = (const BYTE*)source - cctx->currentOffset; lowLimit = (const BYTE*)source; break; } @@ -493,44 +517,38 @@ FORCE_INLINE int LZ4_compress_generic( if (inputSizehashTable, tableType, base); ip++; forwardH = LZ4_hashPosition(ip, tableType); /* Main Loop */ - for ( ; ; ) - { + for ( ; ; ) { + ptrdiff_t refDelta = 0; const BYTE* match; BYTE* token; - { - const BYTE* forwardIp = ip; + + /* Find a match */ + { const BYTE* forwardIp = ip; unsigned step = 1; unsigned searchMatchNb = acceleration << LZ4_skipTrigger; - - /* Find a match */ do { - U32 h = forwardH; + U32 const h = forwardH; ip = forwardIp; forwardIp += step; step = (searchMatchNb++ >> LZ4_skipTrigger); if (unlikely(forwardIp > mflimit)) goto _last_literals; - match = LZ4_getPositionOnHash(h, ctx, tableType, base); - if (dict==usingExtDict) - { - if (match<(const BYTE*)source) - { + match = LZ4_getPositionOnHash(h, cctx->hashTable, tableType, base); + if (dict==usingExtDict) { + if (match < (const BYTE*)source) { refDelta = dictDelta; lowLimit = dictionary; - } - else - { + } else { refDelta = 0; lowLimit = (const BYTE*)source; - } - } + } } forwardH = LZ4_hashPosition(forwardIp, tableType); - LZ4_putPositionOnHash(ip, h, ctx, tableType, base); + LZ4_putPositionOnHash(ip, h, cctx->hashTable, tableType, base); } while ( ((dictIssue==dictSmall) ? (match < lowRefLimit) : 0) || ((tableType==byU16) ? 0 : (match + MAX_DISTANCE < ip)) @@ -538,18 +556,17 @@ FORCE_INLINE int LZ4_compress_generic( } /* Catch up */ - while ((ip>anchor) && (match+refDelta > lowLimit) && (unlikely(ip[-1]==match[refDelta-1]))) { ip--; match--; } + while (((ip>anchor) & (match+refDelta > lowLimit)) && (unlikely(ip[-1]==match[refDelta-1]))) { ip--; match--; } - { - /* Encode Literal length */ - unsigned litLength = (unsigned)(ip - anchor); + /* Encode Literals */ + { unsigned const litLength = (unsigned)(ip - anchor); token = op++; - if ((outputLimited) && (unlikely(op + litLength + (2 + 1 + LASTLITERALS) + (litLength/255) > olimit))) - return 0; /* Check output limit */ - if (litLength>=RUN_MASK) - { + if ((outputLimited) && /* Check output buffer overflow */ + (unlikely(op + litLength + (2 + 1 + LASTLITERALS) + (litLength/255) > olimit))) + return 0; + if (litLength >= RUN_MASK) { int len = (int)litLength-RUN_MASK; - *token=(RUN_MASK<= 255 ; len-=255) *op++ = 255; *op++ = (BYTE)len; } @@ -565,41 +582,37 @@ _next_match: LZ4_writeLE16(op, (U16)(ip-match)); op+=2; /* Encode MatchLength */ - { - unsigned matchLength; + { unsigned matchCode; - if ((dict==usingExtDict) && (lowLimit==dictionary)) - { + if ((dict==usingExtDict) && (lowLimit==dictionary)) { const BYTE* limit; match += refDelta; limit = ip + (dictEnd-match); if (limit > matchlimit) limit = matchlimit; - matchLength = LZ4_count(ip+MINMATCH, match+MINMATCH, limit); - ip += MINMATCH + matchLength; - if (ip==limit) - { - unsigned more = LZ4_count(ip, (const BYTE*)source, matchlimit); - matchLength += more; + matchCode = LZ4_count(ip+MINMATCH, match+MINMATCH, limit); + ip += MINMATCH + matchCode; + if (ip==limit) { + unsigned const more = LZ4_count(ip, (const BYTE*)source, matchlimit); + matchCode += more; ip += more; } - } - else - { - matchLength = LZ4_count(ip+MINMATCH, match+MINMATCH, matchlimit); - ip += MINMATCH + matchLength; + } else { + matchCode = LZ4_count(ip+MINMATCH, match+MINMATCH, matchlimit); + ip += MINMATCH + matchCode; } - if ((outputLimited) && (unlikely(op + (1 + LASTLITERALS) + (matchLength>>8) > olimit))) - return 0; /* Check output limit */ - if (matchLength>=ML_MASK) - { + if ( outputLimited && /* Check output buffer overflow */ + (unlikely(op + (1 + LASTLITERALS) + (matchCode>>8) > olimit)) ) + return 0; + if (matchCode >= ML_MASK) { *token += ML_MASK; - matchLength -= ML_MASK; - for (; matchLength >= 510 ; matchLength-=510) { *op++ = 255; *op++ = 255; } - if (matchLength >= 255) { matchLength-=255; *op++ = 255; } - *op++ = (BYTE)matchLength; - } - else *token += (BYTE)(matchLength); + matchCode -= ML_MASK; + LZ4_write32(op, 0xFFFFFFFF); + while (matchCode >= 4*255) op+=4, LZ4_write32(op, 0xFFFFFFFF), matchCode -= 4*255; + op += matchCode / 255; + *op++ = (BYTE)(matchCode % 255); + } else + *token += (BYTE)(matchCode); } anchor = ip; @@ -608,24 +621,19 @@ _next_match: if (ip > mflimit) break; /* Fill table */ - LZ4_putPosition(ip-2, ctx, tableType, base); + LZ4_putPosition(ip-2, cctx->hashTable, tableType, base); /* Test next position */ - match = LZ4_getPosition(ip, ctx, tableType, base); - if (dict==usingExtDict) - { - if (match<(const BYTE*)source) - { + match = LZ4_getPosition(ip, cctx->hashTable, tableType, base); + if (dict==usingExtDict) { + if (match < (const BYTE*)source) { refDelta = dictDelta; lowLimit = dictionary; - } - else - { + } else { refDelta = 0; lowLimit = (const BYTE*)source; - } - } - LZ4_putPosition(ip, ctx, tableType, base); + } } + LZ4_putPosition(ip, cctx->hashTable, tableType, base); if ( ((dictIssue==dictSmall) ? (match>=lowRefLimit) : 1) && (match+MAX_DISTANCE>=ip) && (LZ4_read32(match+refDelta)==LZ4_read32(ip)) ) @@ -637,19 +645,16 @@ _next_match: _last_literals: /* Encode Last Literals */ - { - const size_t lastRun = (size_t)(iend - anchor); - if ((outputLimited) && ((op - (BYTE*)dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) - return 0; /* Check output limit */ - if (lastRun >= RUN_MASK) - { + { size_t const lastRun = (size_t)(iend - anchor); + if ( (outputLimited) && /* Check output buffer overflow */ + ((op - (BYTE*)dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize) ) + return 0; + if (lastRun >= RUN_MASK) { size_t accumulator = lastRun - RUN_MASK; *op++ = RUN_MASK << ML_BITS; for(; accumulator >= 255 ; accumulator-=255) *op++ = 255; *op++ = (BYTE) accumulator; - } - else - { + } else { *op++ = (BYTE)(lastRun<internal_donotuse; LZ4_resetStream((LZ4_stream_t*)state); if (acceleration < 1) acceleration = ACCELERATION_DEFAULT; - if (maxOutputSize >= LZ4_compressBound(inputSize)) - { + if (maxOutputSize >= LZ4_compressBound(inputSize)) { if (inputSize < LZ4_64Klimit) - return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue, acceleration); + return LZ4_compress_generic(ctx, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue, acceleration); else - return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration); - } - else - { + return LZ4_compress_generic(ctx, source, dest, inputSize, 0, notLimited, (sizeof(void*)==8) ? byU32 : byPtr, noDict, noDictIssue, acceleration); + } else { if (inputSize < LZ4_64Klimit) - return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration); + return LZ4_compress_generic(ctx, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration); else - return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration); + return LZ4_compress_generic(ctx, source, dest, inputSize, maxOutputSize, limitedOutput, (sizeof(void*)==8) ? byU32 : byPtr, noDict, noDictIssue, acceleration); } } @@ -689,10 +692,10 @@ int LZ4_compress_fast(const char* source, char* dest, int inputSize, int maxOutp void* ctxPtr = ALLOCATOR(1, sizeof(LZ4_stream_t)); /* malloc-calloc always properly aligned */ #else LZ4_stream_t ctx; - void* ctxPtr = &ctx; + void* const ctxPtr = &ctx; #endif - int result = LZ4_compress_fast_extState(ctxPtr, source, dest, inputSize, maxOutputSize, acceleration); + int const result = LZ4_compress_fast_extState(ctxPtr, source, dest, inputSize, maxOutputSize, acceleration); #if (HEAPMODE) FREEMEM(ctxPtr); @@ -712,22 +715,21 @@ int LZ4_compress_default(const char* source, char* dest, int inputSize, int maxO int LZ4_compress_fast_force(const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration) { LZ4_stream_t ctx; - LZ4_resetStream(&ctx); if (inputSize < LZ4_64Klimit) - return LZ4_compress_generic(&ctx, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration); + return LZ4_compress_generic(&ctx.internal_donotuse, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration); else - return LZ4_compress_generic(&ctx, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration); + return LZ4_compress_generic(&ctx.internal_donotuse, source, dest, inputSize, maxOutputSize, limitedOutput, sizeof(void*)==8 ? byU32 : byPtr, noDict, noDictIssue, acceleration); } -/******************************** -* destSize variant +/*-****************************** +* *_destSize() variant ********************************/ static int LZ4_compress_destSize_generic( - void* const ctx, + LZ4_stream_t_internal* const ctx, const char* const src, char* const dst, int* const srcSizePtr, @@ -759,32 +761,30 @@ static int LZ4_compress_destSize_generic( /* First Byte */ *srcSizePtr = 0; - LZ4_putPosition(ip, ctx, tableType, base); + LZ4_putPosition(ip, ctx->hashTable, tableType, base); ip++; forwardH = LZ4_hashPosition(ip, tableType); /* Main Loop */ - for ( ; ; ) - { + for ( ; ; ) { const BYTE* match; BYTE* token; - { - const BYTE* forwardIp = ip; + + /* Find a match */ + { const BYTE* forwardIp = ip; unsigned step = 1; unsigned searchMatchNb = 1 << LZ4_skipTrigger; - /* Find a match */ do { U32 h = forwardH; ip = forwardIp; forwardIp += step; step = (searchMatchNb++ >> LZ4_skipTrigger); - if (unlikely(forwardIp > mflimit)) - goto _last_literals; + if (unlikely(forwardIp > mflimit)) goto _last_literals; - match = LZ4_getPositionOnHash(h, ctx, tableType, base); + match = LZ4_getPositionOnHash(h, ctx->hashTable, tableType, base); forwardH = LZ4_hashPosition(forwardIp, tableType); - LZ4_putPositionOnHash(ip, h, ctx, tableType, base); + LZ4_putPositionOnHash(ip, h, ctx->hashTable, tableType, base); } while ( ((tableType==byU16) ? 0 : (match + MAX_DISTANCE < ip)) || (LZ4_read32(match) != LZ4_read32(ip)) ); @@ -793,18 +793,15 @@ static int LZ4_compress_destSize_generic( /* Catch up */ while ((ip>anchor) && (match > lowLimit) && (unlikely(ip[-1]==match[-1]))) { ip--; match--; } - { - /* Encode Literal length */ - unsigned litLength = (unsigned)(ip - anchor); + /* Encode Literal length */ + { unsigned litLength = (unsigned)(ip - anchor); token = op++; - if (op + ((litLength+240)/255) + litLength > oMaxLit) - { + if (op + ((litLength+240)/255) + litLength > oMaxLit) { /* Not enough space for a last match */ op--; goto _last_literals; } - if (litLength>=RUN_MASK) - { + if (litLength>=RUN_MASK) { unsigned len = litLength - RUN_MASK; *token=(RUN_MASK<= 255 ; len-=255) *op++ = 255; @@ -822,21 +819,15 @@ _next_match: LZ4_writeLE16(op, (U16)(ip-match)); op+=2; /* Encode MatchLength */ - { - size_t matchLength; + { size_t matchLength = LZ4_count(ip+MINMATCH, match+MINMATCH, matchlimit); - matchLength = LZ4_count(ip+MINMATCH, match+MINMATCH, matchlimit); - - if (op + ((matchLength+240)/255) > oMaxMatch) - { + if (op + ((matchLength+240)/255) > oMaxMatch) { /* Match description too long : reduce it */ matchLength = (15-1) + (oMaxMatch-op) * 255; } - //printf("offset %5i, matchLength%5i \n", (int)(ip-match), matchLength + MINMATCH); ip += MINMATCH + matchLength; - if (matchLength>=ML_MASK) - { + if (matchLength>=ML_MASK) { *token += ML_MASK; matchLength -= ML_MASK; while (matchLength >= 255) { matchLength-=255; *op++ = 255; } @@ -852,11 +843,11 @@ _next_match: if (op > oMaxSeq) break; /* Fill table */ - LZ4_putPosition(ip-2, ctx, tableType, base); + LZ4_putPosition(ip-2, ctx->hashTable, tableType, base); /* Test next position */ - match = LZ4_getPosition(ip, ctx, tableType, base); - LZ4_putPosition(ip, ctx, tableType, base); + match = LZ4_getPosition(ip, ctx->hashTable, tableType, base); + LZ4_putPosition(ip, ctx->hashTable, tableType, base); if ( (match+MAX_DISTANCE>=ip) && (LZ4_read32(match)==LZ4_read32(ip)) ) { token=op++; *token=0; goto _next_match; } @@ -867,25 +858,20 @@ _next_match: _last_literals: /* Encode Last Literals */ - { - size_t lastRunSize = (size_t)(iend - anchor); - if (op + 1 /* token */ + ((lastRunSize+240)/255) /* litLength */ + lastRunSize /* literals */ > oend) - { + { size_t lastRunSize = (size_t)(iend - anchor); + if (op + 1 /* token */ + ((lastRunSize+240)/255) /* litLength */ + lastRunSize /* literals */ > oend) { /* adapt lastRunSize to fill 'dst' */ lastRunSize = (oend-op) - 1; lastRunSize -= (lastRunSize+240)/255; } ip = anchor + lastRunSize; - if (lastRunSize >= RUN_MASK) - { + if (lastRunSize >= RUN_MASK) { size_t accumulator = lastRunSize - RUN_MASK; *op++ = RUN_MASK << ML_BITS; for(; accumulator >= 255 ; accumulator-=255) *op++ = 255; *op++ = (BYTE) accumulator; - } - else - { + } else { *op++ = (BYTE)(lastRunSize<= LZ4_compressBound(*srcSizePtr)) /* compression success is guaranteed */ - { + if (targetDstSize >= LZ4_compressBound(*srcSizePtr)) { /* compression success is guaranteed */ return LZ4_compress_fast_extState(state, src, dst, *srcSizePtr, targetDstSize, 1); - } - else - { + } else { if (*srcSizePtr < LZ4_64Klimit) - return LZ4_compress_destSize_generic(state, src, dst, srcSizePtr, targetDstSize, byU16); + return LZ4_compress_destSize_generic(&state->internal_donotuse, src, dst, srcSizePtr, targetDstSize, byU16); else - return LZ4_compress_destSize_generic(state, src, dst, srcSizePtr, targetDstSize, LZ4_64bits() ? byU32 : byPtr); + return LZ4_compress_destSize_generic(&state->internal_donotuse, src, dst, srcSizePtr, targetDstSize, sizeof(void*)==8 ? byU32 : byPtr); } } @@ -919,10 +902,10 @@ static int LZ4_compress_destSize_extState (void* state, const char* src, char* d int LZ4_compress_destSize(const char* src, char* dst, int* srcSizePtr, int targetDstSize) { #if (HEAPMODE) - void* ctx = ALLOCATOR(1, sizeof(LZ4_stream_t)); /* malloc-calloc always properly aligned */ + LZ4_stream_t* ctx = (LZ4_stream_t*)ALLOCATOR(1, sizeof(LZ4_stream_t)); /* malloc-calloc always properly aligned */ #else LZ4_stream_t ctxBody; - void* ctx = &ctxBody; + LZ4_stream_t* ctx = &ctxBody; #endif int result = LZ4_compress_destSize_extState(ctx, src, dst, srcSizePtr, targetDstSize); @@ -935,7 +918,7 @@ int LZ4_compress_destSize(const char* src, char* dst, int* srcSizePtr, int targe -/******************************** +/*-****************************** * Streaming functions ********************************/ @@ -959,10 +942,10 @@ int LZ4_freeStream (LZ4_stream_t* LZ4_stream) } -#define HASH_UNIT sizeof(size_t) +#define HASH_UNIT sizeof(reg_t) int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize) { - LZ4_stream_t_internal* dict = (LZ4_stream_t_internal*) LZ4_dict; + LZ4_stream_t_internal* dict = &LZ4_dict->internal_donotuse; const BYTE* p = (const BYTE*)dictionary; const BYTE* const dictEnd = p + dictSize; const BYTE* base; @@ -970,8 +953,7 @@ int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize) if ((dict->initCheck) || (dict->currentOffset > 1 GB)) /* Uninitialized structure, or reuse overflow */ LZ4_resetStream(LZ4_dict); - if (dictSize < (int)HASH_UNIT) - { + if (dictSize < (int)HASH_UNIT) { dict->dictionary = NULL; dict->dictSize = 0; return 0; @@ -984,8 +966,7 @@ int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize) dict->dictSize = (U32)(dictEnd - p); dict->currentOffset += dict->dictSize; - while (p <= dictEnd-HASH_UNIT) - { + while (p <= dictEnd-HASH_UNIT) { LZ4_putPosition(p, dict->hashTable, byU32, base); p+=3; } @@ -997,14 +978,12 @@ int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize) static void LZ4_renormDictT(LZ4_stream_t_internal* LZ4_dict, const BYTE* src) { if ((LZ4_dict->currentOffset > 0x80000000) || - ((size_t)LZ4_dict->currentOffset > (size_t)src)) /* address space overflow */ - { + ((uptrval)LZ4_dict->currentOffset > (uptrval)src)) { /* address space overflow */ /* rescale hash table */ - U32 delta = LZ4_dict->currentOffset - 64 KB; + U32 const delta = LZ4_dict->currentOffset - 64 KB; const BYTE* dictEnd = LZ4_dict->dictionary + LZ4_dict->dictSize; int i; - for (i=0; ihashTable[i] < delta) LZ4_dict->hashTable[i]=0; else LZ4_dict->hashTable[i] -= delta; } @@ -1017,7 +996,7 @@ static void LZ4_renormDictT(LZ4_stream_t_internal* LZ4_dict, const BYTE* src) int LZ4_compress_fast_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration) { - LZ4_stream_t_internal* streamPtr = (LZ4_stream_t_internal*)LZ4_stream; + LZ4_stream_t_internal* streamPtr = &LZ4_stream->internal_donotuse; const BYTE* const dictEnd = streamPtr->dictionary + streamPtr->dictSize; const BYTE* smallest = (const BYTE*) source; @@ -1027,10 +1006,8 @@ int LZ4_compress_fast_continue (LZ4_stream_t* LZ4_stream, const char* source, ch if (acceleration < 1) acceleration = ACCELERATION_DEFAULT; /* Check overlapping input/dictionary space */ - { - const BYTE* sourceEnd = (const BYTE*) source + inputSize; - if ((sourceEnd > streamPtr->dictionary) && (sourceEnd < dictEnd)) - { + { const BYTE* sourceEnd = (const BYTE*) source + inputSize; + if ((sourceEnd > streamPtr->dictionary) && (sourceEnd < dictEnd)) { streamPtr->dictSize = (U32)(dictEnd - sourceEnd); if (streamPtr->dictSize > 64 KB) streamPtr->dictSize = 64 KB; if (streamPtr->dictSize < 4) streamPtr->dictSize = 0; @@ -1039,25 +1016,23 @@ int LZ4_compress_fast_continue (LZ4_stream_t* LZ4_stream, const char* source, ch } /* prefix mode : source data follows dictionary */ - if (dictEnd == (const BYTE*)source) - { + if (dictEnd == (const BYTE*)source) { int result; if ((streamPtr->dictSize < 64 KB) && (streamPtr->dictSize < streamPtr->currentOffset)) - result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, withPrefix64k, dictSmall, acceleration); + result = LZ4_compress_generic(streamPtr, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, withPrefix64k, dictSmall, acceleration); else - result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, withPrefix64k, noDictIssue, acceleration); + result = LZ4_compress_generic(streamPtr, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, withPrefix64k, noDictIssue, acceleration); streamPtr->dictSize += (U32)inputSize; streamPtr->currentOffset += (U32)inputSize; return result; } /* external dictionary mode */ - { - int result; + { int result; if ((streamPtr->dictSize < 64 KB) && (streamPtr->dictSize < streamPtr->currentOffset)) - result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, usingExtDict, dictSmall, acceleration); + result = LZ4_compress_generic(streamPtr, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, usingExtDict, dictSmall, acceleration); else - result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, usingExtDict, noDictIssue, acceleration); + result = LZ4_compress_generic(streamPtr, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, usingExtDict, noDictIssue, acceleration); streamPtr->dictionary = (const BYTE*)source; streamPtr->dictSize = (U32)inputSize; streamPtr->currentOffset += (U32)inputSize; @@ -1069,15 +1044,15 @@ int LZ4_compress_fast_continue (LZ4_stream_t* LZ4_stream, const char* source, ch /* Hidden debug function, to force external dictionary mode */ int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_dict, const char* source, char* dest, int inputSize) { - LZ4_stream_t_internal* streamPtr = (LZ4_stream_t_internal*)LZ4_dict; + LZ4_stream_t_internal* streamPtr = &LZ4_dict->internal_donotuse; int result; const BYTE* const dictEnd = streamPtr->dictionary + streamPtr->dictSize; const BYTE* smallest = dictEnd; if (smallest > (const BYTE*) source) smallest = (const BYTE*) source; - LZ4_renormDictT((LZ4_stream_t_internal*)LZ4_dict, smallest); + LZ4_renormDictT(streamPtr, smallest); - result = LZ4_compress_generic(LZ4_dict, source, dest, inputSize, 0, notLimited, byU32, usingExtDict, noDictIssue, 1); + result = LZ4_compress_generic(streamPtr, source, dest, inputSize, 0, notLimited, byU32, usingExtDict, noDictIssue, 1); streamPtr->dictionary = (const BYTE*)source; streamPtr->dictSize = (U32)inputSize; @@ -1087,10 +1062,17 @@ int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_dict, const char* source, char* } +/*! LZ4_saveDict() : + * If previously compressed data block is not guaranteed to remain available at its memory location, + * save it into a safer place (char* safeBuffer). + * Note : you don't need to call LZ4_loadDict() afterwards, + * dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue(). + * Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error. + */ int LZ4_saveDict (LZ4_stream_t* LZ4_dict, char* safeBuffer, int dictSize) { - LZ4_stream_t_internal* dict = (LZ4_stream_t_internal*) LZ4_dict; - const BYTE* previousDictEnd = dict->dictionary + dict->dictSize; + LZ4_stream_t_internal* const dict = &LZ4_dict->internal_donotuse; + const BYTE* const previousDictEnd = dict->dictionary + dict->dictSize; if ((U32)dictSize > 64 KB) dictSize = 64 KB; /* useless to define a dictionary > 64 KB */ if ((U32)dictSize > dict->dictSize) dictSize = dict->dictSize; @@ -1105,14 +1087,14 @@ int LZ4_saveDict (LZ4_stream_t* LZ4_dict, char* safeBuffer, int dictSize) -/******************************* +/*-***************************** * Decompression functions *******************************/ -/* - * This generic decompression function cover all use cases. - * It shall be instantiated several times, using different sets of directives - * Note that it is essential this generic function is really inlined, - * in order to remove useless branches during compilation optimization. +/*! LZ4_decompress_generic() : + * This generic decompression function cover all use cases. + * It shall be instantiated several times, using different sets of directives + * Note that it is important this generic function is really inlined, + * in order to remove useless branches during compilation optimization. */ FORCE_INLINE int LZ4_decompress_generic( const char* const source, @@ -1124,7 +1106,7 @@ FORCE_INLINE int LZ4_decompress_generic( int partialDecoding, /* full, partial */ int targetOutputSize, /* only used if partialDecoding==partial */ int dict, /* noDict, withPrefix64k, usingExtDict */ - const BYTE* const lowPrefix, /* == dest if dict == noDict */ + const BYTE* const lowPrefix, /* == dest when no prefix */ const BYTE* const dictStart, /* only if dict==usingExtDict */ const size_t dictSize /* note : = 0 if noDict */ ) @@ -1140,53 +1122,45 @@ FORCE_INLINE int LZ4_decompress_generic( const BYTE* const lowLimit = lowPrefix - dictSize; const BYTE* const dictEnd = (const BYTE*)dictStart + dictSize; - const size_t dec32table[] = {4, 1, 2, 1, 4, 4, 4, 4}; - const size_t dec64table[] = {0, 0, 0, (size_t)-1, 0, 1, 2, 3}; + const unsigned dec32table[] = {0, 1, 2, 1, 4, 4, 4, 4}; + const int dec64table[] = {0, 0, 0, -1, 0, 1, 2, 3}; const int safeDecode = (endOnInput==endOnInputSize); const int checkOffset = ((safeDecode) && (dictSize < (int)(64 KB))); /* Special cases */ - if ((partialDecoding) && (oexit> oend-MFLIMIT)) oexit = oend-MFLIMIT; /* targetOutputSize too high => decode everything */ + if ((partialDecoding) && (oexit > oend-MFLIMIT)) oexit = oend-MFLIMIT; /* targetOutputSize too high => decode everything */ if ((endOnInput) && (unlikely(outputSize==0))) return ((inputSize==1) && (*ip==0)) ? 0 : -1; /* Empty output buffer */ if ((!endOnInput) && (unlikely(outputSize==0))) return (*ip==0?1:-1); - - /* Main Loop */ - while (1) - { - unsigned token; + /* Main Loop : decode sequences */ + while (1) { size_t length; const BYTE* match; + size_t offset; /* get literal length */ - token = *ip++; - if ((length=(token>>ML_BITS)) == RUN_MASK) - { + unsigned const token = *ip++; + if ((length=(token>>ML_BITS)) == RUN_MASK) { unsigned s; - do - { + do { s = *ip++; length += s; - } - while (likely((endOnInput)?ip(partialDecoding?oexit:oend-MFLIMIT)) || (ip+length>iend-(2+1+LASTLITERALS))) ) - || ((!endOnInput) && (cpy>oend-COPYLENGTH))) + if ( ((endOnInput) && ((cpy>(partialDecoding?oexit:oend-MFLIMIT)) || (ip+length>iend-(2+1+LASTLITERALS))) ) + || ((!endOnInput) && (cpy>oend-WILDCOPYLENGTH)) ) { - if (partialDecoding) - { + if (partialDecoding) { if (cpy > oend) goto _output_error; /* Error : write attempt beyond end of output buffer */ if ((endOnInput) && (ip+length > iend)) goto _output_error; /* Error : read attempt beyond end of input buffer */ - } - else - { + } else { if ((!endOnInput) && (cpy != oend)) goto _output_error; /* Error : block decoding must stop exactly there */ if ((endOnInput) && ((ip+length != iend) || (cpy > oend))) goto _output_error; /* Error : input must be consumed */ } @@ -1199,84 +1173,76 @@ FORCE_INLINE int LZ4_decompress_generic( ip += length; op = cpy; /* get offset */ - match = cpy - LZ4_readLE16(ip); ip+=2; - if ((checkOffset) && (unlikely(match < lowLimit))) goto _output_error; /* Error : offset outside destination buffer */ + offset = LZ4_readLE16(ip); ip+=2; + match = op - offset; + if ((checkOffset) && (unlikely(match < lowLimit))) goto _output_error; /* Error : offset outside buffers */ + LZ4_write32(op, (U32)offset); /* costs ~1%; silence an msan warning when offset==0 */ /* get matchlength */ length = token & ML_MASK; - if (length == ML_MASK) - { + if (length == ML_MASK) { unsigned s; - do - { - if ((endOnInput) && (ip > iend-LASTLITERALS)) goto _output_error; + do { s = *ip++; + if ((endOnInput) && (ip > iend-LASTLITERALS)) goto _output_error; length += s; } while (s==255); - if ((safeDecode) && unlikely((size_t)(op+length)<(size_t)op)) goto _output_error; /* overflow detection */ + if ((safeDecode) && unlikely((uptrval)(op)+length<(uptrval)op)) goto _output_error; /* overflow detection */ } length += MINMATCH; /* check external dictionary */ - if ((dict==usingExtDict) && (match < lowPrefix)) - { + if ((dict==usingExtDict) && (match < lowPrefix)) { if (unlikely(op+length > oend-LASTLITERALS)) goto _output_error; /* doesn't respect parsing restriction */ - if (length <= (size_t)(lowPrefix-match)) - { + if (length <= (size_t)(lowPrefix-match)) { /* match can be copied as a single segment from external dictionary */ - match = dictEnd - (lowPrefix-match); - memmove(op, match, length); op += length; - } - else - { - /* match encompass external dictionary and current segment */ - size_t copySize = (size_t)(lowPrefix-match); + memmove(op, dictEnd - (lowPrefix-match), length); + op += length; + } else { + /* match encompass external dictionary and current block */ + size_t const copySize = (size_t)(lowPrefix-match); + size_t const restSize = length - copySize; memcpy(op, dictEnd - copySize, copySize); op += copySize; - copySize = length - copySize; - if (copySize > (size_t)(op-lowPrefix)) /* overlap within current segment */ - { - BYTE* const endOfMatch = op + copySize; + if (restSize > (size_t)(op-lowPrefix)) { /* overlap copy */ + BYTE* const endOfMatch = op + restSize; const BYTE* copyFrom = lowPrefix; while (op < endOfMatch) *op++ = *copyFrom++; - } - else - { - memcpy(op, lowPrefix, copySize); - op += copySize; - } - } + } else { + memcpy(op, lowPrefix, restSize); + op += restSize; + } } continue; } - /* copy repeated sequence */ + /* copy match within block */ cpy = op + length; - if (unlikely((op-match)<8)) - { - const size_t dec64 = dec64table[op-match]; + if (unlikely(offset<8)) { + const int dec64 = dec64table[offset]; op[0] = match[0]; op[1] = match[1]; op[2] = match[2]; op[3] = match[3]; - match += dec32table[op-match]; - LZ4_copy4(op+4, match); - op += 8; match -= dec64; - } else { LZ4_copy8(op, match); op+=8; match+=8; } - - if (unlikely(cpy>oend-12)) - { - if (cpy > oend-LASTLITERALS) goto _output_error; /* Error : last LASTLITERALS bytes must be literals */ - if (op < oend-8) - { - LZ4_wildCopy(op, match, oend-8); - match += (oend-8) - op; - op = oend-8; + match += dec32table[offset]; + memcpy(op+4, match, 4); + match -= dec64; + } else { LZ4_copy8(op, match); match+=8; } + op += 8; + + if (unlikely(cpy>oend-12)) { + BYTE* const oCopyLimit = oend-(WILDCOPYLENGTH-1); + if (cpy > oend-LASTLITERALS) goto _output_error; /* Error : last LASTLITERALS bytes must be literals (uncompressed) */ + if (op < oCopyLimit) { + LZ4_wildCopy(op, match, oCopyLimit); + match += oCopyLimit - op; + op = oCopyLimit; } while (op16) LZ4_wildCopy(op+8, match+8, cpy); } - else - LZ4_wildCopy(op, match, cpy); op=cpy; /* correction */ } @@ -1308,15 +1274,7 @@ int LZ4_decompress_fast(const char* source, char* dest, int originalSize) } -/* streaming decompression functions */ - -typedef struct -{ - const BYTE* externalDict; - size_t extDictSize; - const BYTE* prefixEnd; - size_t prefixSize; -} LZ4_streamDecode_t_internal; +/*===== streaming decompression functions =====*/ /* * If you prefer dynamic allocation methods, @@ -1335,16 +1293,16 @@ int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream) return 0; } -/* - * LZ4_setStreamDecode - * Use this function to instruct where to find the dictionary +/*! + * LZ4_setStreamDecode() : + * Use this function to instruct where to find the dictionary. * This function is not necessary if previous data is still available where it was decoded. * Loading a size of 0 is allowed (same effect as no dictionary). * Return : 1 if OK, 0 if error */ int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize) { - LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode; + LZ4_streamDecode_t_internal* lz4sd = &LZ4_streamDecode->internal_donotuse; lz4sd->prefixSize = (size_t) dictSize; lz4sd->prefixEnd = (const BYTE*) dictionary + dictSize; lz4sd->externalDict = NULL; @@ -1361,20 +1319,17 @@ int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dicti */ int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxOutputSize) { - LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode; + LZ4_streamDecode_t_internal* lz4sd = &LZ4_streamDecode->internal_donotuse; int result; - if (lz4sd->prefixEnd == (BYTE*)dest) - { + if (lz4sd->prefixEnd == (BYTE*)dest) { result = LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, usingExtDict, lz4sd->prefixEnd - lz4sd->prefixSize, lz4sd->externalDict, lz4sd->extDictSize); if (result <= 0) return result; lz4sd->prefixSize += result; lz4sd->prefixEnd += result; - } - else - { + } else { lz4sd->extDictSize = lz4sd->prefixSize; lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize; result = LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, @@ -1390,22 +1345,19 @@ int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const ch int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize) { - LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode; + LZ4_streamDecode_t_internal* lz4sd = &LZ4_streamDecode->internal_donotuse; int result; - if (lz4sd->prefixEnd == (BYTE*)dest) - { + if (lz4sd->prefixEnd == (BYTE*)dest) { result = LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, usingExtDict, lz4sd->prefixEnd - lz4sd->prefixSize, lz4sd->externalDict, lz4sd->extDictSize); if (result <= 0) return result; lz4sd->prefixSize += originalSize; lz4sd->prefixEnd += originalSize; - } - else - { + } else { lz4sd->extDictSize = lz4sd->prefixSize; - lz4sd->externalDict = (BYTE*)dest - lz4sd->extDictSize; + lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize; result = LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, usingExtDict, (BYTE*)dest, lz4sd->externalDict, lz4sd->extDictSize); @@ -1429,8 +1381,7 @@ FORCE_INLINE int LZ4_decompress_usingDict_generic(const char* source, char* dest { if (dictSize==0) return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, noDict, (BYTE*)dest, NULL, 0); - if (dictStart+dictSize == dest) - { + if (dictStart+dictSize == dest) { if (dictSize >= (int)(64 KB - 1)) return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, withPrefix64k, (BYTE*)dest-64 KB, NULL, 0); return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, noDict, (BYTE*)dest-dictSize, NULL, 0); @@ -1455,7 +1406,7 @@ int LZ4_decompress_safe_forceExtDict(const char* source, char* dest, int compres } -/*************************************************** +/*=************************************************* * Obsolete Functions ***************************************************/ /* obsolete compression functions */ @@ -1480,29 +1431,29 @@ int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int LZ4_sizeofStreamState() { return LZ4_STREAMSIZE; } -static void LZ4_init(LZ4_stream_t_internal* lz4ds, BYTE* base) +static void LZ4_init(LZ4_stream_t* lz4ds, BYTE* base) { - MEM_INIT(lz4ds, 0, LZ4_STREAMSIZE); - lz4ds->bufferStart = base; + MEM_INIT(lz4ds, 0, sizeof(LZ4_stream_t)); + lz4ds->internal_donotuse.bufferStart = base; } int LZ4_resetStreamState(void* state, char* inputBuffer) { - if ((((size_t)state) & 3) != 0) return 1; /* Error : pointer is not aligned on 4-bytes boundary */ - LZ4_init((LZ4_stream_t_internal*)state, (BYTE*)inputBuffer); + if ((((uptrval)state) & 3) != 0) return 1; /* Error : pointer is not aligned on 4-bytes boundary */ + LZ4_init((LZ4_stream_t*)state, (BYTE*)inputBuffer); return 0; } void* LZ4_create (char* inputBuffer) { - void* lz4ds = ALLOCATOR(8, LZ4_STREAMSIZE_U64); - LZ4_init ((LZ4_stream_t_internal*)lz4ds, (BYTE*)inputBuffer); + LZ4_stream_t* lz4ds = (LZ4_stream_t*)ALLOCATOR(8, sizeof(LZ4_stream_t)); + LZ4_init (lz4ds, (BYTE*)inputBuffer); return lz4ds; } char* LZ4_slideInputBuffer (void* LZ4_Data) { - LZ4_stream_t_internal* ctx = (LZ4_stream_t_internal*)LZ4_Data; + LZ4_stream_t_internal* ctx = &((LZ4_stream_t*)LZ4_Data)->internal_donotuse; int dictSize = LZ4_saveDict((LZ4_stream_t*)LZ4_Data, (char*)ctx->bufferStart, 64 KB); return (char*)(ctx->bufferStart + dictSize); } @@ -1520,5 +1471,4 @@ int LZ4_decompress_fast_withPrefix64k(const char* source, char* dest, int origin } #endif /* LZ4_COMMONDEFS_ONLY */ - #endif /* NEED_COMPAT_LZ4 */ -- cgit v1.2.3