diff options
Diffstat (limited to 'app/openvpn/src/compat/compat-lz4.c')
| -rw-r--r-- | app/openvpn/src/compat/compat-lz4.c | 830 |
1 files changed, 830 insertions, 0 deletions
diff --git a/app/openvpn/src/compat/compat-lz4.c b/app/openvpn/src/compat/compat-lz4.c new file mode 100644 index 00000000..c63c18ba --- /dev/null +++ b/app/openvpn/src/compat/compat-lz4.c @@ -0,0 +1,830 @@ +/* + LZ4 - Fast LZ compression algorithm + Copyright (C) 2011-2013, Yann Collet. + BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following disclaimer + in the documentation and/or other materials provided with the + distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + You can contact the author at : + - LZ4 source repository : http://code.google.com/p/lz4/ + - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c +*/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#elif defined(_MSC_VER) +#include "config-msvc.h" +#endif + +#ifdef NEED_COMPAT_LZ4 + +//************************************** +// Tuning parameters +//************************************** +// MEMORY_USAGE : +// Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) +// Increasing memory usage improves compression ratio +// Reduced memory usage can improve speed, due to cache effect +// Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache +#define MEMORY_USAGE 14 + +// HEAPMODE : +// Select how default compression functions will allocate memory for their hash table, +// in memory stack (0:default, fastest), or in memory heap (1:requires memory allocation (malloc)). +#define HEAPMODE 0 + + +//************************************** +// CPU Feature Detection +//************************************** +// 32 or 64 bits ? +#if (defined(__x86_64__) || defined(_M_X64) || defined(_WIN64) \ + || defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__) \ + || defined(__64BIT__) || defined(_LP64) || defined(__LP64__) \ + || defined(__ia64) || defined(__itanium__) || defined(_M_IA64) ) // Detects 64 bits mode +# define LZ4_ARCH64 1 +#else +# define LZ4_ARCH64 0 +#endif + +// Little Endian or Big Endian ? +// Overwrite the #define below if you know your architecture endianess +#if defined (__GLIBC__) +# include <endian.h> +# if (__BYTE_ORDER == __BIG_ENDIAN) +# define LZ4_BIG_ENDIAN 1 +# endif +#elif (defined(__BIG_ENDIAN__) || defined(__BIG_ENDIAN) || defined(_BIG_ENDIAN)) && !(defined(__LITTLE_ENDIAN__) || defined(__LITTLE_ENDIAN) || defined(_LITTLE_ENDIAN)) +# define LZ4_BIG_ENDIAN 1 +#elif defined(__sparc) || defined(__sparc__) \ + || defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) \ + || defined(__hpux) || defined(__hppa) \ + || defined(_MIPSEB) || defined(__s390__) +# define LZ4_BIG_ENDIAN 1 +#else +// Little Endian assumed. PDP Endian and other very rare endian format are unsupported. +#endif + +// Unaligned memory access is automatically enabled for "common" CPU, such as x86. +// For others CPU, such as ARM, the compiler may be more cautious, inserting unnecessary extra code to ensure aligned access property +// If you know your target CPU supports unaligned memory access, you want to force this option manually to improve performance +#if defined(__ARM_FEATURE_UNALIGNED) +# define LZ4_FORCE_UNALIGNED_ACCESS 1 +#endif + +// Define this parameter if your target system or compiler does not support hardware bit count +#if defined(_MSC_VER) && defined(_WIN32_WCE) // Visual Studio for Windows CE does not support Hardware bit count +# define LZ4_FORCE_SW_BITCOUNT +#endif + +// BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE : +// This option may provide a small boost to performance for some big endian cpu, although probably modest. +// You may set this option to 1 if data will remain within closed environment. +// This option is useless on Little_Endian CPU (such as x86) +//#define BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE 1 + + +//************************************** +// Compiler Options +//************************************** +#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) // C99 +/* "restrict" is a known keyword */ +#else +# define restrict // Disable restrict +#endif + +#ifdef _MSC_VER // Visual Studio +# define FORCE_INLINE static __forceinline +# include <intrin.h> // For Visual 2005 +# if LZ4_ARCH64 // 64-bits +# pragma intrinsic(_BitScanForward64) // For Visual 2005 +# pragma intrinsic(_BitScanReverse64) // For Visual 2005 +# else // 32-bits +# pragma intrinsic(_BitScanForward) // For Visual 2005 +# pragma intrinsic(_BitScanReverse) // For Visual 2005 +# endif +# pragma warning(disable : 4127) // disable: C4127: conditional expression is constant +#else +# ifdef __GNUC__ +# define FORCE_INLINE static inline __attribute__((always_inline)) +# else +# define FORCE_INLINE static inline +# endif +#endif + +#ifdef _MSC_VER +# define lz4_bswap16(x) _byteswap_ushort(x) +#else +# define lz4_bswap16(x) ((unsigned short int) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))) +#endif + +#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) + +#if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__) +# define expect(expr,value) (__builtin_expect ((expr),(value)) ) +#else +# define expect(expr,value) (expr) +#endif + +#define likely(expr) expect((expr) != 0, 1) +#define unlikely(expr) expect((expr) != 0, 0) + + +//************************************** +// Memory routines +//************************************** +#include <stdlib.h> // malloc, calloc, free +#define ALLOCATOR(n,s) calloc(n,s) +#define FREEMEM free +#include <string.h> // memset, memcpy +#define MEM_INIT memset + + +//************************************** +// Includes +//************************************** +#include "compat-lz4.h" + + +//************************************** +// Basic Types +//************************************** +#if 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; +#else + typedef unsigned char BYTE; + typedef unsigned short U16; + typedef unsigned int U32; + typedef signed int S32; + typedef unsigned long long U64; +#endif + +#if defined(__GNUC__) && !defined(LZ4_FORCE_UNALIGNED_ACCESS) +# define _PACKED __attribute__ ((packed)) +#else +# define _PACKED +#endif + +#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__) +# if defined(__IBMC__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) +# pragma pack(1) +# else +# pragma pack(push, 1) +# endif +#endif + +typedef struct { U16 v; } _PACKED U16_S; +typedef struct { U32 v; } _PACKED U32_S; +typedef struct { U64 v; } _PACKED U64_S; +typedef struct {size_t v;} _PACKED size_t_S; + +#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__) +# if defined(__SUNPRO_C) || defined(__SUNPRO_CC) +# pragma pack(0) +# else +# pragma pack(pop) +# endif +#endif + +#define A16(x) (((U16_S *)(x))->v) +#define A32(x) (((U32_S *)(x))->v) +#define A64(x) (((U64_S *)(x))->v) +#define AARCH(x) (((size_t_S *)(x))->v) + + +//************************************** +// Constants +//************************************** +#define LZ4_HASHLOG (MEMORY_USAGE-2) +#define HASHTABLESIZE (1 << MEMORY_USAGE) +#define HASHNBCELLS4 (1 << LZ4_HASHLOG) + +#define MINMATCH 4 + +#define COPYLENGTH 8 +#define LASTLITERALS 5 +#define MFLIMIT (COPYLENGTH+MINMATCH) +const int LZ4_minLength = (MFLIMIT+1); + +#define LZ4_64KLIMIT ((1<<16) + (MFLIMIT-1)) +#define SKIPSTRENGTH 6 // Increasing this value will make the compression run slower on incompressible data + +#define MAXD_LOG 16 +#define MAX_DISTANCE ((1 << MAXD_LOG) - 1) + +#define ML_BITS 4 +#define ML_MASK ((1U<<ML_BITS)-1) +#define RUN_BITS (8-ML_BITS) +#define RUN_MASK ((1U<<RUN_BITS)-1) + +#define KB *(1U<<10) +#define MB *(1U<<20) +#define GB *(1U<<30) + + +//************************************** +// Structures and local types +//************************************** + +typedef struct { + U32 hashTable[HASHNBCELLS4]; + const BYTE* bufferStart; + const BYTE* base; + const BYTE* nextBlock; +} LZ4_Data_Structure; + +typedef enum { notLimited = 0, limited = 1 } limitedOutput_directive; +typedef enum { byPtr, byU32, byU16 } tableType_t; + +typedef enum { noPrefix = 0, withPrefix = 1 } prefix64k_directive; + +typedef enum { endOnOutputSize = 0, endOnInputSize = 1 } endCondition_directive; +typedef enum { full = 0, partial = 1 } earlyEnd_directive; + + +//************************************** +// Architecture-specific macros +//************************************** +#define STEPSIZE sizeof(size_t) +#define LZ4_COPYSTEP(d,s) { AARCH(d) = AARCH(s); d+=STEPSIZE; s+=STEPSIZE; } +#define LZ4_COPY8(d,s) { LZ4_COPYSTEP(d,s); if (STEPSIZE<8) LZ4_COPYSTEP(d,s); } +#define LZ4_SECURECOPY(d,s,e) { if ((STEPSIZE==4)||(d<e)) LZ4_WILDCOPY(d,s,e); } + +#if LZ4_ARCH64 // 64-bit +# define HTYPE U32 +# define INITBASE(base) const BYTE* const base = ip +#else // 32-bit +# define HTYPE const BYTE* +# define INITBASE(base) const int base = 0 +#endif + +#if (defined(LZ4_BIG_ENDIAN) && !defined(BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE)) +# define LZ4_READ_LITTLEENDIAN_16(d,s,p) { U16 v = A16(p); v = lz4_bswap16(v); d = (s) - v; } +# define LZ4_WRITE_LITTLEENDIAN_16(p,i) { U16 v = (U16)(i); v = lz4_bswap16(v); A16(p) = v; p+=2; } +#else // Little Endian +# define LZ4_READ_LITTLEENDIAN_16(d,s,p) { d = (s) - A16(p); } +# define LZ4_WRITE_LITTLEENDIAN_16(p,v) { A16(p) = v; p+=2; } +#endif + + +//************************************** +// Macros +//************************************** +#define LZ4_WILDCOPY(d,s,e) { do { LZ4_COPY8(d,s) } while (d<e); } // at the end, d>=e; + + +//**************************** +// Private functions +//**************************** +#if LZ4_ARCH64 + +FORCE_INLINE int LZ4_NbCommonBytes (register U64 val) +{ +# if defined(LZ4_BIG_ENDIAN) +# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT) + unsigned long r = 0; + _BitScanReverse64( &r, val ); + return (int)(r>>3); +# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) + return (__builtin_clzll(val) >> 3); +# else + int r; + if (!(val>>32)) { r=4; } else { r=0; val>>=32; } + if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; } + r += (!val); + return r; +# endif +# else +# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT) + unsigned long r = 0; + _BitScanForward64( &r, val ); + return (int)(r>>3); +# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) + return (__builtin_ctzll(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 +# endif +} + +#else + +FORCE_INLINE int LZ4_NbCommonBytes (register U32 val) +{ +# if defined(LZ4_BIG_ENDIAN) +# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT) + unsigned long r = 0; + _BitScanReverse( &r, val ); + return (int)(r>>3); +# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) + return (__builtin_clz(val) >> 3); +# else + int r; + if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; } + r += (!val); + return r; +# endif +# else +# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT) + unsigned long r; + _BitScanForward( &r, val ); + return (int)(r>>3); +# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) + return (__builtin_ctz(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 +# endif +} + +#endif + + +//**************************** +// Compression functions +//**************************** +FORCE_INLINE int LZ4_hashSequence(U32 sequence, tableType_t tableType) +{ + if (tableType == byU16) + return (((sequence) * 2654435761U) >> ((MINMATCH*8)-(LZ4_HASHLOG+1))); + else + return (((sequence) * 2654435761U) >> ((MINMATCH*8)-LZ4_HASHLOG)); +} + +FORCE_INLINE int LZ4_hashPosition(const BYTE* p, tableType_t tableType) { return LZ4_hashSequence(A32(p), tableType); } + +FORCE_INLINE void LZ4_putPositionOnHash(const BYTE* p, U32 h, void* tableBase, tableType_t tableType, const BYTE* srcBase) +{ + switch (tableType) + { + case byPtr: { const BYTE** hashTable = (const BYTE**) tableBase; hashTable[h] = p; break; } + case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = (U32)(p-srcBase); break; } + case byU16: { U16* hashTable = (U16*) tableBase; hashTable[h] = (U16)(p-srcBase); break; } + } +} + +FORCE_INLINE void LZ4_putPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase) +{ + U32 h = LZ4_hashPosition(p, tableType); + LZ4_putPositionOnHash(p, h, tableBase, tableType, srcBase); +} + +FORCE_INLINE 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 +} + +FORCE_INLINE const BYTE* LZ4_getPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase) +{ + U32 h = LZ4_hashPosition(p, tableType); + return LZ4_getPositionOnHash(h, tableBase, tableType, srcBase); +} + + +FORCE_INLINE int LZ4_compress_generic( + void* ctx, + const char* source, + char* dest, + int inputSize, + int maxOutputSize, + + limitedOutput_directive limitedOutput, + tableType_t tableType, + prefix64k_directive prefix) +{ + const BYTE* ip = (const BYTE*) source; + const BYTE* const base = (prefix==withPrefix) ? ((LZ4_Data_Structure*)ctx)->base : (const BYTE*) source; + const BYTE* const lowLimit = ((prefix==withPrefix) ? ((LZ4_Data_Structure*)ctx)->bufferStart : (const BYTE*)source); + const BYTE* anchor = (const BYTE*) source; + const BYTE* const iend = ip + inputSize; + const BYTE* const mflimit = iend - MFLIMIT; + const BYTE* const matchlimit = iend - LASTLITERALS; + + BYTE* op = (BYTE*) dest; + BYTE* const oend = op + maxOutputSize; + + int length; + const int skipStrength = SKIPSTRENGTH; + U32 forwardH; + + // Init conditions + if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) return 0; // Unsupported input size, too large (or negative) + if ((prefix==withPrefix) && (ip != ((LZ4_Data_Structure*)ctx)->nextBlock)) return 0; // must continue from end of previous block + if (prefix==withPrefix) ((LZ4_Data_Structure*)ctx)->nextBlock=iend; // do it now, due to potential early exit + if ((tableType == byU16) && (inputSize>=LZ4_64KLIMIT)) return 0; // Size too large (not within 64K limit) + if (inputSize<LZ4_minLength) goto _last_literals; // Input too small, no compression (all literals) + + // First Byte + LZ4_putPosition(ip, ctx, tableType, base); + ip++; forwardH = LZ4_hashPosition(ip, tableType); + + // Main Loop + for ( ; ; ) + { + int findMatchAttempts = (1U << skipStrength) + 3; + const BYTE* forwardIp = ip; + const BYTE* ref; + BYTE* token; + + // Find a match + do { + U32 h = forwardH; + int step = findMatchAttempts++ >> skipStrength; + ip = forwardIp; + forwardIp = ip + step; + + if unlikely(forwardIp > mflimit) { goto _last_literals; } + + forwardH = LZ4_hashPosition(forwardIp, tableType); + ref = LZ4_getPositionOnHash(h, ctx, tableType, base); + LZ4_putPositionOnHash(ip, h, ctx, tableType, base); + + } while ((ref + MAX_DISTANCE < ip) || (A32(ref) != A32(ip))); + + // Catch up + while ((ip>anchor) && (ref > lowLimit) && unlikely(ip[-1]==ref[-1])) { ip--; ref--; } + + // Encode Literal length + length = (int)(ip - anchor); + token = op++; + if ((limitedOutput) && unlikely(op + length + (2 + 1 + LASTLITERALS) + (length/255) > oend)) return 0; // Check output limit + if (length>=(int)RUN_MASK) + { + int len = length-RUN_MASK; + *token=(RUN_MASK<<ML_BITS); + for(; len >= 255 ; len-=255) *op++ = 255; + *op++ = (BYTE)len; + } + else *token = (BYTE)(length<<ML_BITS); + + // Copy Literals + { BYTE* end=(op)+(length); LZ4_WILDCOPY(op,anchor,end); op=end; } + +_next_match: + // Encode Offset + LZ4_WRITE_LITTLEENDIAN_16(op,(U16)(ip-ref)); + + // Start Counting + ip+=MINMATCH; ref+=MINMATCH; // MinMatch already verified + anchor = ip; + while likely(ip<matchlimit-(STEPSIZE-1)) + { + size_t diff = AARCH(ref) ^ AARCH(ip); + if (!diff) { ip+=STEPSIZE; ref+=STEPSIZE; continue; } + ip += LZ4_NbCommonBytes(diff); + goto _endCount; + } + if (LZ4_ARCH64) if ((ip<(matchlimit-3)) && (A32(ref) == A32(ip))) { ip+=4; ref+=4; } + if ((ip<(matchlimit-1)) && (A16(ref) == A16(ip))) { ip+=2; ref+=2; } + if ((ip<matchlimit) && (*ref == *ip)) ip++; +_endCount: + + // Encode MatchLength + length = (int)(ip - anchor); + if ((limitedOutput) && unlikely(op + (1 + LASTLITERALS) + (length>>8) > oend)) return 0; // Check output limit + if (length>=(int)ML_MASK) + { + *token += ML_MASK; + length -= ML_MASK; + for (; length > 509 ; length-=510) { *op++ = 255; *op++ = 255; } + if (length >= 255) { length-=255; *op++ = 255; } + *op++ = (BYTE)length; + } + else *token += (BYTE)(length); + + // Test end of chunk + if (ip > mflimit) { anchor = ip; break; } + + // Fill table + LZ4_putPosition(ip-2, ctx, tableType, base); + + // Test next position + ref = LZ4_getPosition(ip, ctx, tableType, base); + LZ4_putPosition(ip, ctx, tableType, base); + if ((ref + MAX_DISTANCE >= ip) && (A32(ref) == A32(ip))) { token = op++; *token=0; goto _next_match; } + + // Prepare next loop + anchor = ip++; + forwardH = LZ4_hashPosition(ip, tableType); + } + +_last_literals: + // Encode Last Literals + { + int lastRun = (int)(iend - anchor); + if ((limitedOutput) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) return 0; // Check output limit + if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun >= 255 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; } + else *op++ = (BYTE)(lastRun<<ML_BITS); + memcpy(op, anchor, iend - anchor); + op += iend-anchor; + } + + // End + return (int) (((char*)op)-dest); +} + + +int LZ4_compress(const char* source, char* dest, int inputSize) +{ +#if (HEAPMODE) + void* ctx = ALLOCATOR(HASHNBCELLS4, 4); // Aligned on 4-bytes boundaries +#else + U32 ctx[1U<<(MEMORY_USAGE-2)] = {0}; // Ensure data is aligned on 4-bytes boundaries +#endif + int result; + + if (inputSize < (int)LZ4_64KLIMIT) + result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, 0, notLimited, byU16, noPrefix); + else + result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, 0, notLimited, (sizeof(void*)==8) ? byU32 : byPtr, noPrefix); + +#if (HEAPMODE) + FREEMEM(ctx); +#endif + return result; +} + +int LZ4_compress_continue (void* LZ4_Data, const char* source, char* dest, int inputSize) +{ + return LZ4_compress_generic(LZ4_Data, source, dest, inputSize, 0, notLimited, byU32, withPrefix); +} + + +int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize) +{ +#if (HEAPMODE) + void* ctx = ALLOCATOR(HASHNBCELLS4, 4); // Aligned on 4-bytes boundaries +#else + U32 ctx[1U<<(MEMORY_USAGE-2)] = {0}; // Ensure data is aligned on 4-bytes boundaries +#endif + int result; + + if (inputSize < (int)LZ4_64KLIMIT) + result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, maxOutputSize, limited, byU16, noPrefix); + else + result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, maxOutputSize, limited, (sizeof(void*)==8) ? byU32 : byPtr, noPrefix); + +#if (HEAPMODE) + FREEMEM(ctx); +#endif + return result; +} + +int LZ4_compress_limitedOutput_continue (void* LZ4_Data, const char* source, char* dest, int inputSize, int maxOutputSize) +{ + return LZ4_compress_generic(LZ4_Data, source, dest, inputSize, maxOutputSize, limited, byU32, withPrefix); +} + + +//**************************** +// Stream functions +//**************************** + +FORCE_INLINE void LZ4_init(LZ4_Data_Structure* lz4ds, const BYTE* base) +{ + MEM_INIT(lz4ds->hashTable, 0, sizeof(lz4ds->hashTable)); + lz4ds->bufferStart = base; + lz4ds->base = base; + lz4ds->nextBlock = base; +} + + +void* LZ4_create (const char* inputBuffer) +{ + void* lz4ds = ALLOCATOR(1, sizeof(LZ4_Data_Structure)); + LZ4_init ((LZ4_Data_Structure*)lz4ds, (const BYTE*)inputBuffer); + return lz4ds; +} + + +int LZ4_free (void* LZ4_Data) +{ + FREEMEM(LZ4_Data); + return (0); +} + + +char* LZ4_slideInputBuffer (void* LZ4_Data) +{ + LZ4_Data_Structure* lz4ds = (LZ4_Data_Structure*)LZ4_Data; + size_t delta = lz4ds->nextBlock - (lz4ds->bufferStart + 64 KB); + + if ( (lz4ds->base - delta > lz4ds->base) // underflow control + || ((size_t)(lz4ds->nextBlock - lz4ds->base) > 0xE0000000) ) // close to 32-bits limit + { + size_t deltaLimit = (lz4ds->nextBlock - 64 KB) - lz4ds->base; + int nH; + + for (nH=0; nH < HASHNBCELLS4; nH++) + { + if ((size_t)(lz4ds->hashTable[nH]) < deltaLimit) lz4ds->hashTable[nH] = 0; + else lz4ds->hashTable[nH] -= (U32)deltaLimit; + } + memcpy((void*)(lz4ds->bufferStart), (const void*)(lz4ds->nextBlock - 64 KB), 64 KB); + lz4ds->base = lz4ds->bufferStart; + lz4ds->nextBlock = lz4ds->base + 64 KB; + } + else + { + memcpy((void*)(lz4ds->bufferStart), (const void*)(lz4ds->nextBlock - 64 KB), 64 KB); + lz4ds->nextBlock -= delta; + lz4ds->base -= delta; + } + + return (char*)(lz4ds->nextBlock); +} + + +//**************************** +// Decompression functions +//**************************** + +// This generic decompression function cover all use cases. +// It shall be instanciated 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 optimisation. +FORCE_INLINE int LZ4_decompress_generic( + const char* source, + char* dest, + int inputSize, // + int outputSize, // If endOnInput==endOnInputSize, this value is the max size of Output Buffer. + + int endOnInput, // endOnOutputSize, endOnInputSize + int prefix64k, // noPrefix, withPrefix + int partialDecoding, // full, partial + int targetOutputSize // only used if partialDecoding==partial + ) +{ + // Local Variables + const BYTE* restrict ip = (const BYTE*) source; + const BYTE* ref; + const BYTE* const iend = ip + inputSize; + + BYTE* op = (BYTE*) dest; + BYTE* const oend = op + outputSize; + BYTE* cpy; + BYTE* oexit = op + targetOutputSize; + + const size_t dec32table[] = {0, 3, 2, 3, 0, 0, 0, 0}; // static reduces speed for LZ4_decompress_safe() on GCC64 + static const size_t dec64table[] = {0, 0, 0, (size_t)-1, 0, 1, 2, 3}; + + + // Special cases + 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; + size_t length; + + // get runlength + token = *ip++; + if ((length=(token>>ML_BITS)) == RUN_MASK) + { + unsigned s=255; + while (((endOnInput)?ip<iend:1) && (s==255)) + { + s = *ip++; + length += s; + } + } + + // copy literals + cpy = op+length; + if (((endOnInput) && ((cpy>(partialDecoding?oexit:oend-MFLIMIT)) || (ip+length>iend-(2+1+LASTLITERALS))) ) + || ((!endOnInput) && (cpy>oend-COPYLENGTH))) + { + 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 + { + 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 + } + memcpy(op, ip, length); + ip += length; + op += length; + break; // Necessarily EOF, due to parsing restrictions + } + LZ4_WILDCOPY(op, ip, cpy); ip -= (op-cpy); op = cpy; + + // get offset + LZ4_READ_LITTLEENDIAN_16(ref,cpy,ip); ip+=2; + if ((prefix64k==noPrefix) && unlikely(ref < (BYTE* const)dest)) goto _output_error; // Error : offset outside destination buffer + + // get matchlength + if ((length=(token&ML_MASK)) == ML_MASK) + { + while ((!endOnInput) || (ip<iend-(LASTLITERALS+1))) // Ensure enough bytes remain for LASTLITERALS + token + { + unsigned s = *ip++; + length += s; + if (s==255) continue; + break; + } + } + + // copy repeated sequence + if unlikely((op-ref)<(int)STEPSIZE) + { + const size_t dec64 = dec64table[(sizeof(void*)==4) ? 0 : op-ref]; + op[0] = ref[0]; + op[1] = ref[1]; + op[2] = ref[2]; + op[3] = ref[3]; + op += 4, ref += 4; ref -= dec32table[op-ref]; + A32(op) = A32(ref); + op += STEPSIZE-4; ref -= dec64; + } else { LZ4_COPYSTEP(op,ref); } + cpy = op + length - (STEPSIZE-4); + + if unlikely(cpy>oend-COPYLENGTH-(STEPSIZE-4)) + { + if (cpy > oend-LASTLITERALS) goto _output_error; // Error : last 5 bytes must be literals + LZ4_SECURECOPY(op, ref, (oend-COPYLENGTH)); + while(op<cpy) *op++=*ref++; + op=cpy; + continue; + } + LZ4_WILDCOPY(op, ref, cpy); + op=cpy; // correction + } + + // end of decoding + if (endOnInput) + return (int) (((char*)op)-dest); // Nb of output bytes decoded + else + return (int) (((char*)ip)-source); // Nb of input bytes read + + // Overflow error detected +_output_error: + return (int) (-(((char*)ip)-source))-1; +} + + +int LZ4_decompress_safe(const char* source, char* dest, int inputSize, int maxOutputSize) +{ + return LZ4_decompress_generic(source, dest, inputSize, maxOutputSize, endOnInputSize, noPrefix, full, 0); +} + +int LZ4_decompress_safe_withPrefix64k(const char* source, char* dest, int inputSize, int maxOutputSize) +{ + return LZ4_decompress_generic(source, dest, inputSize, maxOutputSize, endOnInputSize, withPrefix, full, 0); +} + +int LZ4_decompress_safe_partial(const char* source, char* dest, int inputSize, int targetOutputSize, int maxOutputSize) +{ + return LZ4_decompress_generic(source, dest, inputSize, maxOutputSize, endOnInputSize, noPrefix, partial, targetOutputSize); +} + +int LZ4_decompress_fast_withPrefix64k(const char* source, char* dest, int outputSize) +{ + return LZ4_decompress_generic(source, dest, 0, outputSize, endOnOutputSize, withPrefix, full, 0); +} + +int LZ4_decompress_fast(const char* source, char* dest, int outputSize) +{ +#ifdef _MSC_VER // This version is faster with Visual + return LZ4_decompress_generic(source, dest, 0, outputSize, endOnOutputSize, noPrefix, full, 0); +#else + return LZ4_decompress_generic(source, dest, 0, outputSize, endOnOutputSize, withPrefix, full, 0); +#endif +} +#endif |