13e966d968
Correction : large files support on 32-bits unix (reported by Karthik Rajeswaran) lz4c : reduce the amount of displayed information in default mode; introduce a verbose mode lz4c : changed help message Updated xxHash to r31 Made bench.c compatible with tcc Corrected : a few minor warnings found by CppCheck, as suggested by Brian White lz4.c : Pushed BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE farther in the code, since it is reported as providing little benefit Corrected : minor 64K input condition, detected by Mat Hostetter git-svn-id: https://lz4.googlecode.com/svn/trunk@99 650e7d94-2a16-8b24-b05c-7c0b3f6821cd
697 lines
25 KiB
C
697 lines
25 KiB
C
/*
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LZ4 - Fast LZ compression algorithm
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Copyright (C) 2011-2013, Yann Collet.
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BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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You can contact the author at :
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- LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
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- LZ4 source repository : http://code.google.com/p/lz4/
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*/
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/*
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Note : this source file requires "lz4_encoder.h"
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*/
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//**************************************
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// Tuning parameters
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//**************************************
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// MEMORY_USAGE :
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// Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
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// Increasing memory usage improves compression ratio
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// Reduced memory usage can improve speed, due to cache effect
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// Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
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#define MEMORY_USAGE 14
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// HEAPMODE :
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// Select how default compression function will allocate memory for its hash table,
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// in memory stack (0:default, fastest), or in memory heap (1:requires memory allocation (malloc)).
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// Default allocation strategy is to use stack (HEAPMODE 0)
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// Note : explicit functions *_stack* and *_heap* are unaffected by this setting
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#define HEAPMODE 0
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//**************************************
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// CPU Feature Detection
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//**************************************
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// 32 or 64 bits ?
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#if (defined(__x86_64__) || defined(_M_X64) || defined(_WIN64) \
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|| defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__) \
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|| defined(__64BIT__) || defined(_LP64) || defined(__LP64__) \
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|| defined(__ia64) || defined(__itanium__) || defined(_M_IA64) ) // Detects 64 bits mode
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# define LZ4_ARCH64 1
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#else
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# define LZ4_ARCH64 0
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#endif
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// Little Endian or Big Endian ?
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// Overwrite the #define below if you know your architecture endianess
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#if defined (__GLIBC__)
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# include <endian.h>
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# if (__BYTE_ORDER == __BIG_ENDIAN)
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# define LZ4_BIG_ENDIAN 1
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# endif
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#elif (defined(__BIG_ENDIAN__) || defined(__BIG_ENDIAN) || defined(_BIG_ENDIAN)) && !(defined(__LITTLE_ENDIAN__) || defined(__LITTLE_ENDIAN) || defined(_LITTLE_ENDIAN))
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# define LZ4_BIG_ENDIAN 1
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#elif defined(__sparc) || defined(__sparc__) \
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|| defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) \
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|| defined(__hpux) || defined(__hppa) \
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|| defined(_MIPSEB) || defined(__s390__)
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# define LZ4_BIG_ENDIAN 1
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#else
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// Little Endian assumed. PDP Endian and other very rare endian format are unsupported.
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#endif
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// Unaligned memory access is automatically enabled for "common" CPU, such as x86.
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// For others CPU, such as ARM, the compiler may be more cautious, inserting unnecessary extra code to ensure aligned access property
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// If you know your target CPU supports unaligned memory access, you want to force this option manually to improve performance
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#if defined(__ARM_FEATURE_UNALIGNED)
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# define LZ4_FORCE_UNALIGNED_ACCESS 1
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#endif
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// Define this parameter if your target system or compiler does not support hardware bit count
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#if defined(_MSC_VER) && defined(_WIN32_WCE) // Visual Studio for Windows CE does not support Hardware bit count
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# define LZ4_FORCE_SW_BITCOUNT
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#endif
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// BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE :
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// This option may provide a small boost to performance for some big endian cpu, although probably modest.
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// You may set this option to 1 if data will remain within closed environment.
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// This option is useless on Little_Endian CPU (such as x86)
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//#define BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE 1
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//**************************************
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// Compiler Options
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//**************************************
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#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) // C99
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/* "restrict" is a known keyword */
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#else
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# define restrict // Disable restrict
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#endif
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#ifdef _MSC_VER // Visual Studio
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# define forceinline static __forceinline
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# include <intrin.h> // For Visual 2005
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# if LZ4_ARCH64 // 64-bits
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# pragma intrinsic(_BitScanForward64) // For Visual 2005
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# pragma intrinsic(_BitScanReverse64) // For Visual 2005
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# else // 32-bits
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# pragma intrinsic(_BitScanForward) // For Visual 2005
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# pragma intrinsic(_BitScanReverse) // For Visual 2005
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# endif
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# pragma warning(disable : 4127) // disable: C4127: conditional expression is constant
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#else
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# ifdef __GNUC__
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# define forceinline static inline __attribute__((always_inline))
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# else
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# define forceinline static inline
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# endif
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#endif
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#ifdef _MSC_VER
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# define lz4_bswap16(x) _byteswap_ushort(x)
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#else
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# define lz4_bswap16(x) ((unsigned short int) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
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#endif
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#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
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#if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__)
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# define expect(expr,value) (__builtin_expect ((expr),(value)) )
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#else
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# define expect(expr,value) (expr)
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#endif
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#define likely(expr) expect((expr) != 0, 1)
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#define unlikely(expr) expect((expr) != 0, 0)
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//**************************************
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// Includes
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//**************************************
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#include <stdlib.h> // for malloc
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#include <string.h> // for memset
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#include "lz4.h"
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//**************************************
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// Basic Types
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//**************************************
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#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L // C99
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# include <stdint.h>
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typedef uint8_t BYTE;
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typedef uint16_t U16;
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typedef uint32_t U32;
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typedef int32_t S32;
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typedef uint64_t U64;
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#else
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typedef unsigned char BYTE;
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typedef unsigned short U16;
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typedef unsigned int U32;
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typedef signed int S32;
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typedef unsigned long long U64;
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#endif
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#if defined(__GNUC__) && !defined(LZ4_FORCE_UNALIGNED_ACCESS)
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# define _PACKED __attribute__ ((packed))
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#else
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# define _PACKED
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#endif
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#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
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# ifdef __IBMC__
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# pragma pack(1)
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# else
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# pragma pack(push, 1)
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# endif
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#endif
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typedef struct { U16 v; } _PACKED U16_S;
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typedef struct { U32 v; } _PACKED U32_S;
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typedef struct { U64 v; } _PACKED U64_S;
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typedef struct {size_t v;} _PACKED size_t_S;
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#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
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# pragma pack(pop)
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#endif
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#define A16(x) (((U16_S *)(x))->v)
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#define A32(x) (((U32_S *)(x))->v)
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#define A64(x) (((U64_S *)(x))->v)
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#define AARCH(x) (((size_t_S *)(x))->v)
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//**************************************
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// Constants
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//**************************************
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#define HASHTABLESIZE (1 << MEMORY_USAGE)
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#define MINMATCH 4
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#define COPYLENGTH 8
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#define LASTLITERALS 5
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#define MFLIMIT (COPYLENGTH+MINMATCH)
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#define MINLENGTH (MFLIMIT+1)
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#define LZ4_64KLIMIT ((1<<16) + (MFLIMIT-1))
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#define SKIPSTRENGTH 6 // Increasing this value will make the compression run slower on incompressible data
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#define MAXD_LOG 16
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#define MAX_DISTANCE ((1 << MAXD_LOG) - 1)
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#define ML_BITS 4
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#define ML_MASK ((1U<<ML_BITS)-1)
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#define RUN_BITS (8-ML_BITS)
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#define RUN_MASK ((1U<<RUN_BITS)-1)
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//**************************************
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// Architecture-specific macros
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//**************************************
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#define STEPSIZE sizeof(size_t)
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#define LZ4_COPYSTEP(s,d) { AARCH(d) = AARCH(s); d+=STEPSIZE; s+=STEPSIZE; }
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#define LZ4_COPY8(s,d) { LZ4_COPYSTEP(s,d); if (STEPSIZE<8) LZ4_COPYSTEP(s,d); }
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#define LZ4_SECURECOPY(s,d,e) { if ((STEPSIZE==8)&&(d<e)) LZ4_WILDCOPY(s,d,e); }
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#if LZ4_ARCH64 // 64-bit
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# define HTYPE U32
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# define INITBASE(base) const BYTE* const base = ip
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#else // 32-bit
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# define HTYPE const BYTE*
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# define INITBASE(base) const int base = 0
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#endif
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#if (defined(LZ4_BIG_ENDIAN) && !defined(BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE))
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# define LZ4_READ_LITTLEENDIAN_16(d,s,p) { U16 v = A16(p); v = lz4_bswap16(v); d = (s) - v; }
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# define LZ4_WRITE_LITTLEENDIAN_16(p,i) { U16 v = (U16)(i); v = lz4_bswap16(v); A16(p) = v; p+=2; }
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#else // Little Endian
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# define LZ4_READ_LITTLEENDIAN_16(d,s,p) { d = (s) - A16(p); }
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# define LZ4_WRITE_LITTLEENDIAN_16(p,v) { A16(p) = v; p+=2; }
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#endif
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//**************************************
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// Macros
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//**************************************
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#define LZ4_WILDCOPY(s,d,e) { do { LZ4_COPY8(s,d) } while (d<e); }
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#define LZ4_BLINDCOPY(s,d,l) { BYTE* e=(d)+(l); LZ4_WILDCOPY(s,d,e); d=e; }
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//****************************
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// Private functions
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//****************************
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#if LZ4_ARCH64
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forceinline int LZ4_NbCommonBytes (register U64 val)
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{
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# if defined(LZ4_BIG_ENDIAN)
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# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
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unsigned long r = 0;
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_BitScanReverse64( &r, val );
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return (int)(r>>3);
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# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
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return (__builtin_clzll(val) >> 3);
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# else
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int r;
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if (!(val>>32)) { r=4; } else { r=0; val>>=32; }
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if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
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r += (!val);
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return r;
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# endif
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# else
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# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
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unsigned long r = 0;
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_BitScanForward64( &r, val );
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return (int)(r>>3);
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# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
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return (__builtin_ctzll(val) >> 3);
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# else
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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 };
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return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58];
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# endif
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# endif
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}
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#else
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forceinline int LZ4_NbCommonBytes (register U32 val)
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{
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# if defined(LZ4_BIG_ENDIAN)
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# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
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unsigned long r = 0;
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_BitScanReverse( &r, val );
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return (int)(r>>3);
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# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
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return (__builtin_clz(val) >> 3);
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# else
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int r;
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if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
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r += (!val);
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return r;
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# endif
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# else
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# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
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unsigned long r;
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_BitScanForward( &r, val );
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return (int)(r>>3);
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# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
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return (__builtin_ctz(val) >> 3);
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# else
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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 };
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return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
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# endif
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# endif
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}
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#endif
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//******************************
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// Compression functions
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//******************************
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/*
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int LZ4_compress_stack(
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const char* source,
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char* dest,
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int inputSize)
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Compress 'inputSize' bytes from 'source' into an output buffer 'dest'.
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Destination buffer must be already allocated, and sized at a minimum of LZ4_compressBound(inputSize).
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return : the number of bytes written in buffer 'dest'
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*/
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#define FUNCTION_NAME LZ4_compress_stack
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#include "lz4_encoder.h"
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/*
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int LZ4_compress_stack_limitedOutput(
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const char* source,
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char* dest,
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int inputSize,
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int maxOutputSize)
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Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
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If it cannot achieve it, compression will stop, and result of the function will be zero.
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return : the number of bytes written in buffer 'dest', or 0 if the compression fails
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*/
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#define FUNCTION_NAME LZ4_compress_stack_limitedOutput
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#define LIMITED_OUTPUT
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#include "lz4_encoder.h"
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/*
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int LZ4_compress64k_stack(
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const char* source,
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char* dest,
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int inputSize)
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Compress 'inputSize' bytes from 'source' into an output buffer 'dest'.
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This function compresses better than LZ4_compress_stack(), on the condition that
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'inputSize' must be < to LZ4_64KLIMIT, or the function will fail.
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Destination buffer must be already allocated, and sized at a minimum of LZ4_compressBound(inputSize).
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return : the number of bytes written in buffer 'dest', or 0 if compression fails
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*/
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#define FUNCTION_NAME LZ4_compress64k_stack
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#define COMPRESS_64K
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#include "lz4_encoder.h"
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/*
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int LZ4_compress64k_stack_limitedOutput(
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const char* source,
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char* dest,
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int inputSize,
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int maxOutputSize)
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Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
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This function compresses better than LZ4_compress_stack_limitedOutput(), on the condition that
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'inputSize' must be < to LZ4_64KLIMIT, or the function will fail.
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If it cannot achieve it, compression will stop, and result of the function will be zero.
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return : the number of bytes written in buffer 'dest', or 0 if the compression fails
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*/
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#define FUNCTION_NAME LZ4_compress64k_stack_limitedOutput
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#define COMPRESS_64K
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#define LIMITED_OUTPUT
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#include "lz4_encoder.h"
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/*
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void* LZ4_createHeapMemory();
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int LZ4_freeHeapMemory(void* ctx);
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Used to allocate and free hashTable memory
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to be used by the LZ4_compress_heap* family of functions.
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LZ4_createHeapMemory() returns NULL is memory allocation fails.
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*/
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void* LZ4_create() { return malloc(HASHTABLESIZE); }
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int LZ4_free(void* ctx) { free(ctx); return 0; }
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/*
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int LZ4_compress_heap(
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void* ctx,
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const char* source,
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char* dest,
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int inputSize)
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Compress 'inputSize' bytes from 'source' into an output buffer 'dest'.
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The memory used for compression must be created by LZ4_createHeapMemory() and provided by pointer 'ctx'.
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Destination buffer must be already allocated, and sized at a minimum of LZ4_compressBound(inputSize).
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return : the number of bytes written in buffer 'dest'
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*/
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#define FUNCTION_NAME LZ4_compress_heap
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#define USE_HEAPMEMORY
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#include "lz4_encoder.h"
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/*
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int LZ4_compress_heap_limitedOutput(
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void* ctx,
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const char* source,
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char* dest,
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int inputSize,
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int maxOutputSize)
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Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
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If it cannot achieve it, compression will stop, and result of the function will be zero.
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The memory used for compression must be created by LZ4_createHeapMemory() and provided by pointer 'ctx'.
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return : the number of bytes written in buffer 'dest', or 0 if the compression fails
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*/
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#define FUNCTION_NAME LZ4_compress_heap_limitedOutput
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#define LIMITED_OUTPUT
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#define USE_HEAPMEMORY
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#include "lz4_encoder.h"
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/*
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int LZ4_compress64k_heap(
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void* ctx,
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const char* source,
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char* dest,
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int inputSize)
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Compress 'inputSize' bytes from 'source' into an output buffer 'dest'.
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The memory used for compression must be created by LZ4_createHeapMemory() and provided by pointer 'ctx'.
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'inputSize' must be < to LZ4_64KLIMIT, or the function will fail.
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Destination buffer must be already allocated, and sized at a minimum of LZ4_compressBound(inputSize).
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return : the number of bytes written in buffer 'dest'
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*/
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#define FUNCTION_NAME LZ4_compress64k_heap
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#define COMPRESS_64K
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#define USE_HEAPMEMORY
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#include "lz4_encoder.h"
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/*
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int LZ4_compress64k_heap_limitedOutput(
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void* ctx,
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const char* source,
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char* dest,
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int inputSize,
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int maxOutputSize)
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Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
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If it cannot achieve it, compression will stop, and result of the function will be zero.
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The memory used for compression must be created by LZ4_createHeapMemory() and provided by pointer 'ctx'.
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'inputSize' must be < to LZ4_64KLIMIT, or the function will fail.
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return : the number of bytes written in buffer 'dest', or 0 if the compression fails
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*/
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#define FUNCTION_NAME LZ4_compress64k_heap_limitedOutput
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#define COMPRESS_64K
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#define LIMITED_OUTPUT
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#define USE_HEAPMEMORY
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#include "lz4_encoder.h"
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int LZ4_compress(const char* source, char* dest, int inputSize)
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{
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#if HEAPMODE
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void* ctx = LZ4_create();
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int result;
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if (ctx == NULL) return 0; // Failed allocation => compression not done
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if (inputSize < LZ4_64KLIMIT)
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result = LZ4_compress64k_heap(ctx, source, dest, inputSize);
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else result = LZ4_compress_heap(ctx, source, dest, inputSize);
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LZ4_free(ctx);
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return result;
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#else
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if (inputSize < (int)LZ4_64KLIMIT) return LZ4_compress64k_stack(source, dest, inputSize);
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return LZ4_compress_stack(source, dest, inputSize);
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#endif
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}
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int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize)
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{
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#if HEAPMODE
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void* ctx = LZ4_create();
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int result;
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if (ctx == NULL) return 0; // Failed allocation => compression not done
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if (inputSize < LZ4_64KLIMIT)
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result = LZ4_compress64k_heap_limitedOutput(ctx, source, dest, inputSize, maxOutputSize);
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else result = LZ4_compress_heap_limitedOutput(ctx, source, dest, inputSize, maxOutputSize);
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LZ4_free(ctx);
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return result;
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#else
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if (inputSize < (int)LZ4_64KLIMIT) return LZ4_compress64k_stack_limitedOutput(source, dest, inputSize, maxOutputSize);
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return LZ4_compress_stack_limitedOutput(source, dest, inputSize, maxOutputSize);
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#endif
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}
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//****************************
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// Decompression functions
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//****************************
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typedef enum { noPrefix = 0, withPrefix = 1 } prefix64k_directive;
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typedef enum { endOnOutputSize = 0, endOnInputSize = 1 } endCondition_directive;
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typedef enum { full = 0, partial = 1 } earlyEnd_directive;
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// This generic decompression function cover all use cases.
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// It shall be instanciated several times, using different sets of directives
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// Note that it is essential this generic function is really inlined,
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// in order to remove useless branches during compilation optimisation.
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forceinline int LZ4_decompress_generic(
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const char* source,
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char* dest,
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int inputSize, //
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int outputSize, // OutputSize must be != 0; if endOnInput==endOnInputSize, this value is the max size of Output Buffer.
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int endOnInput, // endOnOutputSize, endOnInputSize
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int prefix64k, // noPrefix, withPrefix
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int partialDecoding, // full, partial
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int targetOutputSize // only used if partialDecoding==partial
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)
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{
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// Local Variables
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const BYTE* restrict ip = (const BYTE*) source;
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const BYTE* ref;
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const BYTE* const iend = ip + inputSize;
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BYTE* op = (BYTE*) dest;
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BYTE* const oend = op + outputSize;
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BYTE* cpy;
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BYTE* oexit = op + targetOutputSize;
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size_t dec32table[] = {0, 3, 2, 3, 0, 0, 0, 0};
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#if LZ4_ARCH64
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size_t dec64table[] = {0, 0, 0, (size_t)-1, 0, 1, 2, 3};
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#endif
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// Special cases
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if ((partialDecoding) && (oexit> oend-MFLIMIT)) oexit = oend-MFLIMIT; // targetOutputSize too high => decode everything
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if ((endOnInput) && unlikely(outputSize==0)) return ((inputSize==1) && (*ip==0)) ? 0 : -1; // Empty output buffer
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if ((!endOnInput) && unlikely(outputSize==0)) return (*ip==0?1:-1);
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// Main Loop
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while (1)
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{
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unsigned token;
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size_t length;
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// get runlength
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token = *ip++;
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if ((length=(token>>ML_BITS)) == RUN_MASK)
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{
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unsigned s=255;
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while (((endOnInput)?ip<iend:1) && (s==255))
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{
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s = *ip++;
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length += s;
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}
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}
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// copy literals
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cpy = op+length;
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if (((endOnInput) && ((cpy>(partialDecoding?oexit:oend-MFLIMIT)) || (ip+length>iend-(2+1+LASTLITERALS))) )
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|| ((!endOnInput) && (cpy>oend-COPYLENGTH)))
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{
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if (partialDecoding)
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{
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if (cpy > oend) goto _output_error; // Error : write attempt beyond end of output buffer
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if ((endOnInput) && (ip+length > iend)) goto _output_error; // Error : read attempt beyond end of input buffer
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}
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else
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{
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if ((!endOnInput) && (cpy != oend)) goto _output_error; // Error : block decoding must stop exactly there
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if ((endOnInput) && ((ip+length != iend) || (cpy > oend))) goto _output_error; // Error : input must be consumed
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}
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memcpy(op, ip, length);
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ip += length;
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op += length;
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break; // Necessarily EOF, due to parsing restrictions
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}
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LZ4_WILDCOPY(ip, op, cpy); ip -= (op-cpy); op = cpy;
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// get offset
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LZ4_READ_LITTLEENDIAN_16(ref,cpy,ip); ip+=2;
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if ((prefix64k==noPrefix) && unlikely(ref < (BYTE* const)dest)) goto _output_error; // Error : offset outside destination buffer
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// get matchlength
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if ((length=(token&ML_MASK)) == ML_MASK)
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{
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for ( ; (!endOnInput) || (ip<iend-(LASTLITERALS+1)) ; ) // Ensure enough bytes remain for LASTLITERALS + token
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{
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unsigned s = *ip++;
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length += s;
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if (s==255) continue;
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break;
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}
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}
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// copy repeated sequence
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if unlikely((op-ref)<(int)STEPSIZE)
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{
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#if LZ4_ARCH64
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size_t dec64 = dec64table[op-ref];
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#else
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const size_t dec64 = 0;
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#endif
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op[0] = ref[0];
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op[1] = ref[1];
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op[2] = ref[2];
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op[3] = ref[3];
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op += 4, ref += 4; ref -= dec32table[op-ref];
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A32(op) = A32(ref);
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op += STEPSIZE-4; ref -= dec64;
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} else { LZ4_COPYSTEP(ref,op); }
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cpy = op + length - (STEPSIZE-4);
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if unlikely(cpy>oend-(COPYLENGTH)-(STEPSIZE-4))
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{
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if (cpy > oend-LASTLITERALS) goto _output_error; // Error : last 5 bytes must be literals
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LZ4_SECURECOPY(ref, op, (oend-COPYLENGTH));
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while(op<cpy) *op++=*ref++;
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op=cpy;
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continue;
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}
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LZ4_WILDCOPY(ref, op, cpy);
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op=cpy; // correction
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}
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// end of decoding
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if (endOnInput)
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return (int) (((char*)op)-dest); // Nb of output bytes decoded
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else
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return (int) (((char*)ip)-source); // Nb of input bytes read
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// Overflow error detected
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_output_error:
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return (int) (-(((char*)ip)-source))-1;
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}
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int LZ4_decompress_safe(const char* source, char* dest, int inputSize, int maxOutputSize)
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{
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return LZ4_decompress_generic(source, dest, inputSize, maxOutputSize, endOnInputSize, noPrefix, full, 0);
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}
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int LZ4_decompress_fast(const char* source, char* dest, int outputSize)
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{
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return LZ4_decompress_generic(source, dest, 0, outputSize, endOnOutputSize, noPrefix, full, 0);
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}
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int LZ4_decompress_safe_withPrefix64k(const char* source, char* dest, int inputSize, int maxOutputSize)
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{
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return LZ4_decompress_generic(source, dest, inputSize, maxOutputSize, endOnInputSize, withPrefix, full, 0);
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}
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int LZ4_decompress_fast_withPrefix64k(const char* source, char* dest, int outputSize)
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{
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return LZ4_decompress_generic(source, dest, 0, outputSize, endOnOutputSize, withPrefix, full, 0);
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}
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int LZ4_decompress_safe_partial(const char* source, char* dest, int inputSize, int targetOutputSize, int maxOutputSize)
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{
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return LZ4_decompress_generic(source, dest, inputSize, maxOutputSize, endOnInputSize, noPrefix, partial, targetOutputSize);
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}
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