+/* 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)
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
**************************************/
/*
* 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 :
#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
#endif
-/**************************************
-* Includes
+/*-************************************
+* Dependency
**************************************/
#include "compat-lz4.h"
+/* see also "memory routines" below */
-/**************************************
+/*-************************************
* Compiler Options
**************************************/
#ifdef _MSC_VER /* Visual Studio */
# 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)
#define unlikely(expr) expect((expr) != 0, 0)
-/**************************************
+/*-************************************
* Memory routines
**************************************/
#include <stdlib.h> /* malloc, calloc, free */
#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 <stdint.h>
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));
}
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<e);
}
-/**************************************
+/*-************************************
* Common Constants
**************************************/
#define MINMATCH 4
-#define COPYLENGTH 8
+#define WILDCOPYLENGTH 8
#define LASTLITERALS 5
-#define MFLIMIT (COPYLENGTH+MINMATCH)
+#define MFLIMIT (WILDCOPYLENGTH+MINMATCH)
static const int LZ4_minLength = (MFLIMIT+1);
#define KB *(1 <<10)
#define RUN_MASK ((1U<<RUN_BITS)-1)
-/**************************************
+/*-************************************
* Common Utils
**************************************/
#define LZ4_STATIC_ASSERT(c) { enum { LZ4_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */
-/**************************************
+/*-************************************
* Common functions
**************************************/
-static unsigned LZ4_NbCommonBytes (register size_t val)
+static unsigned LZ4_NbCommonBytes (register reg_t val)
{
- if (LZ4_isLittleEndian())
- {
- if (LZ4_64bits())
- {
+ if (LZ4_isLittleEndian()) {
+ if (sizeof(val)==8) {
# 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(__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;
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;
}
}
+#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<pInLimit-(STEPSIZE-1)))
- {
- size_t diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn);
+ while (likely(pIn<pInLimit-(STEPSIZE-1))) {
+ reg_t const diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn);
if (!diff) { pIn+=STEPSIZE; pMatch+=STEPSIZE; continue; }
pIn += LZ4_NbCommonBytes(diff);
return (unsigned)(pIn - pStart);
}
- if (LZ4_64bits()) if ((pIn<(pInLimit-3)) && (LZ4_read32(pMatch) == LZ4_read32(pIn))) { pIn+=4; pMatch+=4; }
+ if ((STEPSIZE==8) && (pIn<(pInLimit-3)) && (LZ4_read32(pMatch) == LZ4_read32(pIn))) { pIn+=4; pMatch+=4; }
if ((pIn<(pInLimit-1)) && (LZ4_read16(pMatch) == LZ4_read16(pIn))) { pIn+=2; pMatch+=2; }
if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++;
return (unsigned)(pIn - pStart);
#ifndef LZ4_COMMONDEFS_ONLY
-/**************************************
+/*-************************************
* Local Constants
**************************************/
-#define LZ4_HASHLOG (LZ4_MEMORY_USAGE-2)
-#define HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
-#define HASH_SIZE_U32 (1 << LZ4_HASHLOG) /* required as macro for static allocation */
-
static const int LZ4_64Klimit = ((64 KB) + (MFLIMIT-1));
static const U32 LZ4_skipTrigger = 6; /* Increase this value ==> 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;
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<<hashLog) - 1;
- return ((sequence * prime5bytes) >> (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)
}
}
-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,
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;
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:
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;
}
if (inputSize<LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */
/* First Byte */
- LZ4_putPosition(ip, ctx, tableType, base);
+ LZ4_putPosition(ip, cctx->hashTable, 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))
}
/* 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<<ML_BITS);
+ *token = (RUN_MASK<<ML_BITS);
for(; len >= 255 ; len-=255) *op++ = 255;
*op++ = (BYTE)len;
}
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;
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)) )
_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<<ML_BITS);
}
memcpy(op, anchor, lastRun);
int LZ4_compress_fast_extState(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
{
+ LZ4_stream_t_internal* ctx = &((LZ4_stream_t*)state)->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);
}
}
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);
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,
/* 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)) );
/* 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<<ML_BITS);
for(; len >= 255 ; len-=255) *op++ = 255;
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; }
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; }
_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<<ML_BITS);
}
memcpy(op, anchor, lastRunSize);
}
-static int LZ4_compress_destSize_extState (void* state, const char* src, char* dst, int* srcSizePtr, int targetDstSize)
+static int LZ4_compress_destSize_extState (LZ4_stream_t* state, const char* src, char* dst, int* srcSizePtr, int targetDstSize)
{
- LZ4_resetStream((LZ4_stream_t*)state);
+ LZ4_resetStream(state);
- if (targetDstSize >= 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);
}
}
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);
-/********************************
+/*-******************************
* Streaming functions
********************************/
}
-#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;
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;
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;
}
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; i<HASH_SIZE_U32; i++)
- {
+ for (i=0; i<LZ4_HASH_SIZE_U32; i++) {
if (LZ4_dict->hashTable[i] < delta) LZ4_dict->hashTable[i]=0;
else LZ4_dict->hashTable[i] -= delta;
}
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;
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;
}
/* 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;
/* 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;
}
+/*! 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;
-/*******************************
+/*-*****************************
* 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,
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 */
)
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<iend-RUN_MASK:1) && (s==255));
- if ((safeDecode) && unlikely((size_t)(op+length)<(size_t)(op))) goto _output_error; /* overflow detection */
- if ((safeDecode) && unlikely((size_t)(ip+length)<(size_t)(ip))) goto _output_error; /* overflow detection */
+ } while ( likely(endOnInput ? ip<iend-RUN_MASK : 1) & (s==255) );
+ if ((safeDecode) && unlikely((uptrval)(op)+length<(uptrval)(op))) goto _output_error; /* overflow detection */
+ if ((safeDecode) && unlikely((uptrval)(ip)+length<(uptrval)(ip))) goto _output_error; /* overflow detection */
}
/* copy literals */
cpy = op+length;
- if (((endOnInput) && ((cpy>(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 */
}
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 (op<cpy) *op++ = *match++;
+ } else {
+ LZ4_copy8(op, match);
+ if (length>16) LZ4_wildCopy(op+8, match+8, cpy);
}
- else
- LZ4_wildCopy(op, match, cpy);
op=cpy; /* correction */
}
}
-/* 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,
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;
*/
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,
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);
{
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);
}
-/***************************************************
+/*=*************************************************
* Obsolete Functions
***************************************************/
/* obsolete compression functions */
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);
}
}
#endif /* LZ4_COMMONDEFS_ONLY */
-
#endif /* NEED_COMPAT_LZ4 */
/*
- LZ4 - Fast LZ compression algorithm
- Header File
- Copyright (C) 2011-2015, Yann Collet.
+ * LZ4 - Fast LZ compression algorithm
+ * Header File
+ * Copyright (C) 2011-2016, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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
*/
-#pragma once
+#ifndef LZ4_H_2983827168210
+#define LZ4_H_2983827168210
#if defined (__cplusplus)
extern "C" {
#endif
+/* --- Dependency --- */
+#include <stddef.h> /* size_t */
+
+
+/**
+ Introduction
+
+ LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s per core,
+ scalable with multi-cores CPU. It features an extremely fast decoder, with speed in
+ multiple GB/s per core, typically reaching RAM speed limits on multi-core systems.
+
+ The LZ4 compression library provides in-memory compression and decompression functions.
+ Compression can be done in:
+ - a single step (described as Simple Functions)
+ - a single step, reusing a context (described in Advanced Functions)
+ - unbounded multiple steps (described as Streaming compression)
+
+ lz4.h provides block compression functions. It gives full buffer control to user.
+ Decompressing an lz4-compressed block also requires metadata (such as compressed size).
+ Each application is free to encode such metadata in whichever way it wants.
+
+ An additional format, called LZ4 frame specification (doc/lz4_Frame_format.md),
+ take care of encoding standard metadata alongside LZ4-compressed blocks.
+ If your application requires interoperability, it's recommended to use it.
+ A library is provided to take care of it, see lz4frame.h.
+*/
+
+/*^***************************************************************
+* Export parameters
+*****************************************************************/
/*
- * lz4.h provides block compression functions, and gives full buffer control to programmer.
- * If you need to generate inter-operable compressed data (respecting LZ4 frame specification),
- * and can let the library handle its own memory, please use lz4frame.h instead.
+* LZ4_DLL_EXPORT :
+* Enable exporting of functions when building a Windows DLL
*/
+#if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
+# define LZ4LIB_API __declspec(dllexport)
+#elif defined(LZ4_DLL_IMPORT) && (LZ4_DLL_IMPORT==1)
+# define LZ4LIB_API __declspec(dllimport) /* It isn't required but allows to generate better code, saving a function pointer load from the IAT and an indirect jump.*/
+#else
+# define LZ4LIB_API
+#endif
-/**************************************
-* Version
-**************************************/
+
+/*========== Version =========== */
#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
#define LZ4_VERSION_MINOR 7 /* for new (non-breaking) interface capabilities */
-#define LZ4_VERSION_RELEASE 1 /* for tweaks, bug-fixes, or development */
+#define LZ4_VERSION_RELEASE 5 /* for tweaks, bug-fixes, or development */
+
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
-int LZ4_versionNumber (void);
-/**************************************
+#define LZ4_LIB_VERSION LZ4_VERSION_MAJOR.LZ4_VERSION_MINOR.LZ4_VERSION_RELEASE
+#define LZ4_QUOTE(str) #str
+#define LZ4_EXPAND_AND_QUOTE(str) LZ4_QUOTE(str)
+#define LZ4_VERSION_STRING LZ4_EXPAND_AND_QUOTE(LZ4_LIB_VERSION)
+
+LZ4LIB_API int LZ4_versionNumber (void);
+LZ4LIB_API const char* LZ4_versionString (void);
+
+
+/*-************************************
* Tuning parameter
**************************************/
-/*
+/*!
* LZ4_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
#define LZ4_MEMORY_USAGE 14
-/**************************************
+/*-************************************
* Simple Functions
**************************************/
-
-int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
-int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
-
-/*
-LZ4_compress_default() :
+/*! LZ4_compress_default() :
Compresses 'sourceSize' bytes from buffer 'source'
into already allocated 'dest' buffer of size 'maxDestSize'.
Compression is guaranteed to succeed if 'maxDestSize' >= LZ4_compressBound(sourceSize).
sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE
maxDestSize : full or partial size of buffer 'dest' (which must be already allocated)
return : the number of bytes written into buffer 'dest' (necessarily <= maxOutputSize)
- or 0 if compression fails
+ or 0 if compression fails */
+LZ4LIB_API int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
-LZ4_decompress_safe() :
+/*! LZ4_decompress_safe() :
compressedSize : is the precise full size of the compressed block.
maxDecompressedSize : is the size of destination buffer, which must be already allocated.
return : the number of bytes decompressed into destination buffer (necessarily <= maxDecompressedSize)
This function is protected against buffer overflow exploits, including malicious data packets.
It never writes outside output buffer, nor reads outside input buffer.
*/
+LZ4LIB_API int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
-/**************************************
+/*-************************************
* Advanced Functions
**************************************/
#define LZ4_MAX_INPUT_SIZE 0x7E000000 /* 2 113 929 216 bytes */
#define LZ4_COMPRESSBOUND(isize) ((unsigned)(isize) > (unsigned)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
-/*
+/*!
LZ4_compressBound() :
Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible)
This function is primarily useful for memory allocation purposes (destination buffer size).
return : maximum output size in a "worst case" scenario
or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
*/
-int LZ4_compressBound(int inputSize);
+LZ4LIB_API int LZ4_compressBound(int inputSize);
-/*
+/*!
LZ4_compress_fast() :
Same as LZ4_compress_default(), but allows to select an "acceleration" factor.
The larger the acceleration value, the faster the algorithm, but also the lesser the compression.
An acceleration value of "1" is the same as regular LZ4_compress_default()
Values <= 0 will be replaced by ACCELERATION_DEFAULT (see lz4.c), which is 1.
*/
-int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
+LZ4LIB_API int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
-/*
+/*!
LZ4_compress_fast_extState() :
Same compression function, just using an externally allocated memory space to store compression state.
Use LZ4_sizeofState() to know how much memory must be allocated,
and allocate it on 8-bytes boundaries (using malloc() typically).
Then, provide it as 'void* state' to compression function.
*/
-int LZ4_sizeofState(void);
-int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
+LZ4LIB_API int LZ4_sizeofState(void);
+LZ4LIB_API int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
-/*
+/*!
LZ4_compress_destSize() :
Reverse the logic, by compressing as much data as possible from 'source' buffer
into already allocated buffer 'dest' of size 'targetDestSize'.
return : Nb bytes written into 'dest' (necessarily <= targetDestSize)
or 0 if compression fails
*/
-int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
+LZ4LIB_API int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
-/*
+/*!
LZ4_decompress_fast() :
originalSize : is the original and therefore uncompressed size
return : the number of bytes read from the source buffer (in other words, the compressed size)
However, it does not provide any protection against intentionally modified data stream (malicious input).
Use this function in trusted environment only (data to decode comes from a trusted source).
*/
-int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
+LZ4LIB_API int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
-/*
+/*!
LZ4_decompress_safe_partial() :
This function decompress a compressed block of size 'compressedSize' at position 'source'
into destination buffer 'dest' of size 'maxDecompressedSize'.
If the source stream is detected malformed, the function will stop decoding and return a negative result.
This function never writes outside of output buffer, and never reads outside of input buffer. It is therefore protected against malicious data packets
*/
-int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
+LZ4LIB_API int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
-/***********************************************
+/*-*********************************************
* Streaming Compression Functions
***********************************************/
-#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
-#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(long long))
-/*
- * LZ4_stream_t
- * information structure to track an LZ4 stream.
- * important : init this structure content before first use !
- * note : only allocated directly the structure if you are statically linking LZ4
- * If you are using liblz4 as a DLL, please use below construction methods instead.
- */
-typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t;
+typedef union LZ4_stream_u LZ4_stream_t; /* incomplete type (defined later) */
-/*
- * LZ4_resetStream
- * Use this function to init an allocated LZ4_stream_t structure
+/*! LZ4_createStream() and LZ4_freeStream() :
+ * LZ4_createStream() will allocate and initialize an `LZ4_stream_t` structure.
+ * LZ4_freeStream() releases its memory.
*/
-void LZ4_resetStream (LZ4_stream_t* streamPtr);
+LZ4LIB_API LZ4_stream_t* LZ4_createStream(void);
+LZ4LIB_API int LZ4_freeStream (LZ4_stream_t* streamPtr);
-/*
- * LZ4_createStream will allocate and initialize an LZ4_stream_t structure
- * LZ4_freeStream releases its memory.
- * In the context of a DLL (liblz4), please use these methods rather than the static struct.
- * They are more future proof, in case of a change of LZ4_stream_t size.
+/*! LZ4_resetStream() :
+ * An LZ4_stream_t structure can be allocated once and re-used multiple times.
+ * Use this function to init an allocated `LZ4_stream_t` structure and start a new compression.
*/
-LZ4_stream_t* LZ4_createStream(void);
-int LZ4_freeStream (LZ4_stream_t* streamPtr);
+LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);
-/*
- * LZ4_loadDict
- * Use this function to load a static dictionary into LZ4_stream.
- * Any previous data will be forgotten, only 'dictionary' will remain in memory.
- * Loading a size of 0 is allowed.
- * Return : dictionary size, in bytes (necessarily <= 64 KB)
+/*! LZ4_loadDict() :
+ * Use this function to load a static dictionary into LZ4_stream.
+ * Any previous data will be forgotten, only 'dictionary' will remain in memory.
+ * Loading a size of 0 is allowed.
+ * Return : dictionary size, in bytes (necessarily <= 64 KB)
*/
-int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
-
-/*
- * LZ4_compress_fast_continue
- * Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
- * Important : Previous data blocks are assumed to still be present and unmodified !
- * 'dst' buffer must be already allocated.
- * If maxDstSize >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
- * If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function returns a zero.
+LZ4LIB_API int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
+
+/*! LZ4_compress_fast_continue() :
+ * Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
+ * Important : Previous data blocks are assumed to still be present and unmodified !
+ * 'dst' buffer must be already allocated.
+ * If maxDstSize >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
+ * If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function returns a zero.
*/
-int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
-
-/*
- * 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
+LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
+
+/*! 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* streamPtr, char* safeBuffer, int dictSize);
+LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
-/************************************************
+/*-**********************************************
* Streaming Decompression Functions
+* Bufferless synchronous API
************************************************/
+typedef union LZ4_streamDecode_u LZ4_streamDecode_t; /* incomplete type (defined later) */
-#define LZ4_STREAMDECODESIZE_U64 4
-#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
-typedef struct { unsigned long long table[LZ4_STREAMDECODESIZE_U64]; } LZ4_streamDecode_t;
-/*
- * LZ4_streamDecode_t
- * information structure to track an LZ4 stream.
- * init this structure content using LZ4_setStreamDecode or memset() before first use !
- *
- * In the context of a DLL (liblz4) please prefer usage of construction methods below.
- * They are more future proof, in case of a change of LZ4_streamDecode_t size in the future.
- * LZ4_createStreamDecode will allocate and initialize an LZ4_streamDecode_t structure
- * LZ4_freeStreamDecode releases its memory.
- */
-LZ4_streamDecode_t* LZ4_createStreamDecode(void);
-int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
+/* creation / destruction of streaming decompression tracking structure */
+LZ4LIB_API LZ4_streamDecode_t* LZ4_createStreamDecode(void);
+LZ4LIB_API int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
-/*
- * LZ4_setStreamDecode
- * Use this function to instruct where to find the dictionary.
- * Setting a size of 0 is allowed (same effect as reset).
- * Return : 1 if OK, 0 if error
+/*! LZ4_setStreamDecode() :
+ * Use this function to instruct where to find the dictionary.
+ * Setting a size of 0 is allowed (same effect as reset).
+ * @return : 1 if OK, 0 if error
*/
-int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
+LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
-/*
-*_continue() :
+/*!
+LZ4_decompress_*_continue() :
These decoding functions allow decompression of multiple blocks in "streaming" mode.
Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB)
In the case of a ring buffers, decoding buffer must be either :
Whenever these conditions are not possible, save the last 64KB of decoded data into a safe buffer,
and indicate where it is saved using LZ4_setStreamDecode()
*/
-int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
-int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
+LZ4LIB_API int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
+LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
-/*
-Advanced decoding functions :
-*_usingDict() :
- These decoding functions work the same as
- a combination of LZ4_setStreamDecode() followed by LZ4_decompress_x_continue()
- They are stand-alone. They don't need nor update an LZ4_streamDecode_t structure.
-*/
-int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
-int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
+/*! LZ4_decompress_*_usingDict() :
+ * These decoding functions work the same as
+ * a combination of LZ4_setStreamDecode() followed by LZ4_decompress_*_continue()
+ * They are stand-alone, and don't need an LZ4_streamDecode_t structure.
+ */
+LZ4LIB_API int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
+LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
+
+
+/*^**********************************************
+ * !!!!!! STATIC LINKING ONLY !!!!!!
+ ***********************************************/
+/*-************************************
+ * Private definitions
+ **************************************
+ * Do not use these definitions.
+ * They are exposed to allow static allocation of `LZ4_stream_t` and `LZ4_streamDecode_t`.
+ * Using these definitions will expose code to API and/or ABI break in future versions of the library.
+ **************************************/
+#define LZ4_HASHLOG (LZ4_MEMORY_USAGE-2)
+#define LZ4_HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
+#define LZ4_HASH_SIZE_U32 (1 << LZ4_HASHLOG) /* required as macro for static allocation */
+
+#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
+#include <stdint.h>
+
+typedef struct {
+ uint32_t hashTable[LZ4_HASH_SIZE_U32];
+ uint32_t currentOffset;
+ uint32_t initCheck;
+ const uint8_t* dictionary;
+ uint8_t* bufferStart; /* obsolete, used for slideInputBuffer */
+ uint32_t dictSize;
+} LZ4_stream_t_internal;
+
+typedef struct {
+ const uint8_t* externalDict;
+ size_t extDictSize;
+ const uint8_t* prefixEnd;
+ size_t prefixSize;
+} LZ4_streamDecode_t_internal;
+
+#else
+
+typedef struct {
+ unsigned int hashTable[LZ4_HASH_SIZE_U32];
+ unsigned int currentOffset;
+ unsigned int initCheck;
+ const unsigned char* dictionary;
+ unsigned char* bufferStart; /* obsolete, used for slideInputBuffer */
+ unsigned int dictSize;
+} LZ4_stream_t_internal;
+
+typedef struct {
+ const unsigned char* externalDict;
+ size_t extDictSize;
+ const unsigned char* prefixEnd;
+ size_t prefixSize;
+} LZ4_streamDecode_t_internal;
+
+#endif
+/*!
+ * LZ4_stream_t :
+ * information structure to track an LZ4 stream.
+ * init this structure before first use.
+ * note : only use in association with static linking !
+ * this definition is not API/ABI safe,
+ * and may change in a future version !
+ */
+#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
+#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(unsigned long long))
+union LZ4_stream_u {
+ unsigned long long table[LZ4_STREAMSIZE_U64];
+ LZ4_stream_t_internal internal_donotuse;
+} ; /* previously typedef'd to LZ4_stream_t */
+
+
+/*!
+ * LZ4_streamDecode_t :
+ * information structure to track an LZ4 stream during decompression.
+ * init this structure using LZ4_setStreamDecode (or memset()) before first use
+ * note : only use in association with static linking !
+ * this definition is not API/ABI safe,
+ * and may change in a future version !
+ */
+#define LZ4_STREAMDECODESIZE_U64 4
+#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
+union LZ4_streamDecode_u {
+ unsigned long long table[LZ4_STREAMDECODESIZE_U64];
+ LZ4_streamDecode_t_internal internal_donotuse;
+} ; /* previously typedef'd to LZ4_streamDecode_t */
-/**************************************
+/*=************************************
* Obsolete Functions
**************************************/
-/* Deprecate Warnings */
-/* Should these warnings messages be a problem,
+/* Deprecation warnings */
+/* Should these warnings be a problem,
it is generally possible to disable them,
- with -Wno-deprecated-declarations for gcc
- or _CRT_SECURE_NO_WARNINGS in Visual for example.
- You can also define LZ4_DEPRECATE_WARNING_DEFBLOCK. */
-#ifndef LZ4_DEPRECATE_WARNING_DEFBLOCK
-# define LZ4_DEPRECATE_WARNING_DEFBLOCK
+ typically with -Wno-deprecated-declarations for gcc
+ or _CRT_SECURE_NO_WARNINGS in Visual.
+ Otherwise, it's also possible to define LZ4_DISABLE_DEPRECATE_WARNINGS */
+#ifdef LZ4_DISABLE_DEPRECATE_WARNINGS
+# define LZ4_DEPRECATED(message) /* disable deprecation warnings */
+#else
# define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
-# if (LZ4_GCC_VERSION >= 405) || defined(__clang__)
+# if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */
+# define LZ4_DEPRECATED(message) [[deprecated(message)]]
+# elif (LZ4_GCC_VERSION >= 405) || defined(__clang__)
# define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
# elif (LZ4_GCC_VERSION >= 301)
# define LZ4_DEPRECATED(message) __attribute__((deprecated))
# pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
# define LZ4_DEPRECATED(message)
# endif
-#endif /* LZ4_DEPRECATE_WARNING_DEFBLOCK */
+#endif /* LZ4_DISABLE_DEPRECATE_WARNINGS */
/* Obsolete compression functions */
-/* These functions are planned to start generate warnings by r131 approximately */
-int LZ4_compress (const char* source, char* dest, int sourceSize);
-int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
-int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
-int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
-int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
-int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
+LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress (const char* source, char* dest, int sourceSize);
+LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
+LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
+LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
+LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
+LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
/* Obsolete decompression functions */
/* These function names are completely deprecated and must no longer be used.
- They are only provided here for compatibility with older programs.
+ They are only provided in lz4.c for compatibility with older programs.
- LZ4_uncompress is the same as LZ4_decompress_fast
- LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe
These function prototypes are now disabled; uncomment them only if you really need them.
#if defined (__cplusplus)
}
#endif
+
+#endif /* LZ4_H_2983827168210 */
projects / thirdparty / openvpn.git / commitdiff
