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git-svn-id: https://svn.eduke32.com/eduke32@4697 1a8010ca-5511-0410-912e-c29ae57300e0
878 lines
31 KiB
C
878 lines
31 KiB
C
/*
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LZ4 - Fast LZ compression algorithm
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Copyright (C) 2011-2014, 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 source repository : http://code.google.com/p/lz4/
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- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
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*/
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/**************************************
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Tuning parameters
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**************************************/
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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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*/
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#define MEMORY_USAGE 14
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/*
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* HEAPMODE :
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* Select how default compression functions will allocate memory for their 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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*/
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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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/*
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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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*/
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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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/*
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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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*/
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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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/*
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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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*/
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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 FORCE_INLINE 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 FORCE_INLINE static inline __attribute__((always_inline))
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# else
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# define FORCE_INLINE static inline
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# endif
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#endif
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#ifdef _MSC_VER /* Visual Studio */
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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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Memory routines
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**************************************/
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#include "compat.h"
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#include <stdlib.h> /* malloc, calloc, free */
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#define ALLOCATOR(n,s) Xcalloc(n,s)
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#define FREEMEM Bfree
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#include <string.h> /* memset, memcpy */
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#define MEM_INIT Bmemset
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/**************************************
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Includes
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**************************************/
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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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# if defined(__IBMC__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
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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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# if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
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# pragma pack(0)
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# else
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# pragma pack(pop)
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# endif
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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 LZ4_HASHLOG (MEMORY_USAGE-2)
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#define HASHTABLESIZE (1 << MEMORY_USAGE)
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#define HASHNBCELLS4 (1 << LZ4_HASHLOG)
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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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static const int LZ4_minLength = (MFLIMIT+1);
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#define KB *(1U<<10)
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#define MB *(1U<<20)
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#define GB *(1U<<30)
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#define LZ4_64KLIMIT ((64 KB) + (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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Structures and local types
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**************************************/
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typedef struct {
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U32 hashTable[HASHNBCELLS4];
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const BYTE* bufferStart;
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const BYTE* base;
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const BYTE* nextBlock;
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} LZ4_Data_Structure;
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typedef enum { notLimited = 0, limited = 1 } limitedOutput_directive;
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typedef enum { byPtr, byU32, byU16 } tableType_t;
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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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/**************************************
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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(d,s) { AARCH(d) = AARCH(s); d+=STEPSIZE; s+=STEPSIZE; }
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#define LZ4_COPY8(d,s) { LZ4_COPYSTEP(d,s); if (STEPSIZE<8) LZ4_COPYSTEP(d,s); }
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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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#if LZ4_ARCH64 || !defined(__GNUC__)
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# define LZ4_WILDCOPY(d,s,e) { do { LZ4_COPY8(d,s) } while (d<e); } /* at the end, d>=e; */
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#else
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# define LZ4_WILDCOPY(d,s,e) { if (likely(e-d <= 8)) LZ4_COPY8(d,s) else do { LZ4_COPY8(d,s) } while (d<e); }
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#endif
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#define LZ4_SECURECOPY(d,s,e) { if (d<e) LZ4_WILDCOPY(d,s,e); }
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/****************************
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Private local functions
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****************************/
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#if LZ4_ARCH64
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FORCE_INLINE 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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FORCE_INLINE 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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FORCE_INLINE int LZ4_hashSequence(U32 sequence, tableType_t tableType)
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{
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if (tableType == byU16)
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return (((sequence) * 2654435761U) >> ((MINMATCH*8)-(LZ4_HASHLOG+1)));
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else
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return (((sequence) * 2654435761U) >> ((MINMATCH*8)-LZ4_HASHLOG));
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}
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FORCE_INLINE int LZ4_hashPosition(const BYTE* p, tableType_t tableType) { return LZ4_hashSequence(A32(p), tableType); }
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FORCE_INLINE void LZ4_putPositionOnHash(const BYTE* p, U32 h, void* tableBase, tableType_t tableType, const BYTE* srcBase)
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{
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switch (tableType)
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{
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case byPtr: { const BYTE** hashTable = (const BYTE**) tableBase; hashTable[h] = p; break; }
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case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = (U32)(p-srcBase); break; }
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case byU16: { U16* hashTable = (U16*) tableBase; hashTable[h] = (U16)(p-srcBase); break; }
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}
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}
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FORCE_INLINE void LZ4_putPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase)
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{
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U32 h = LZ4_hashPosition(p, tableType);
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LZ4_putPositionOnHash(p, h, tableBase, tableType, srcBase);
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}
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FORCE_INLINE const BYTE* LZ4_getPositionOnHash(U32 h, void* tableBase, tableType_t tableType, const BYTE* srcBase)
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{
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if (tableType == byPtr) { const BYTE** hashTable = (const BYTE**) tableBase; return hashTable[h]; }
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if (tableType == byU32) { U32* hashTable = (U32*) tableBase; return hashTable[h] + srcBase; }
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{ U16* hashTable = (U16*) tableBase; return hashTable[h] + srcBase; } /* default, to ensure a return */
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}
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FORCE_INLINE const BYTE* LZ4_getPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase)
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{
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U32 h = LZ4_hashPosition(p, tableType);
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return LZ4_getPositionOnHash(h, tableBase, tableType, srcBase);
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}
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FORCE_INLINE int LZ4_compress_generic(
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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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limitedOutput_directive limitedOutput,
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tableType_t tableType,
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prefix64k_directive prefix)
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{
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const BYTE* ip = (const BYTE*) source;
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const BYTE* const base = (prefix==withPrefix) ? ((LZ4_Data_Structure*)ctx)->base : (const BYTE*) source;
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const BYTE* const lowLimit = ((prefix==withPrefix) ? ((LZ4_Data_Structure*)ctx)->bufferStart : (const BYTE*)source);
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const BYTE* anchor = (const BYTE*) source;
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const BYTE* const iend = ip + inputSize;
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const BYTE* const mflimit = iend - MFLIMIT;
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const BYTE* const matchlimit = iend - LASTLITERALS;
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BYTE* op = (BYTE*) dest;
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BYTE* const oend = op + maxOutputSize;
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int length;
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const int skipStrength = SKIPSTRENGTH;
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U32 forwardH;
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|
|
|
/* 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>=(int)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_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;
|
|
}
|
|
|
|
|
|
/*****************************
|
|
Using external allocation
|
|
*****************************/
|
|
|
|
int LZ4_sizeofState() { return 1 << MEMORY_USAGE; }
|
|
|
|
|
|
int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize)
|
|
{
|
|
if (((size_t)(state)&3) != 0) return 0; /* Error : state is not aligned on 4-bytes boundary */
|
|
MEM_INIT(state, 0, LZ4_sizeofState());
|
|
|
|
if (inputSize < (int)LZ4_64KLIMIT)
|
|
return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, byU16, noPrefix);
|
|
else
|
|
return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, (sizeof(void*)==8) ? byU32 : byPtr, noPrefix);
|
|
}
|
|
|
|
|
|
int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize)
|
|
{
|
|
if (((size_t)(state)&3) != 0) return 0; /* Error : state is not aligned on 4-bytes boundary */
|
|
MEM_INIT(state, 0, LZ4_sizeofState());
|
|
|
|
if (inputSize < (int)LZ4_64KLIMIT)
|
|
return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limited, byU16, noPrefix);
|
|
else
|
|
return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limited, (sizeof(void*)==8) ? byU32 : byPtr, noPrefix);
|
|
}
|
|
|
|
|
|
/****************************
|
|
Stream functions
|
|
****************************/
|
|
|
|
int LZ4_sizeofStreamState()
|
|
{
|
|
return sizeof(LZ4_Data_Structure);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
int LZ4_resetStreamState(void* state, const char* inputBuffer)
|
|
{
|
|
if ((((size_t)state) & 3) != 0) return 1; /* Error : pointer is not aligned on 4-bytes boundary */
|
|
LZ4_init((LZ4_Data_Structure*)state, (const BYTE*)inputBuffer);
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
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_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);
|
|
}
|
|
|
|
|
|
/****************************
|
|
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 */
|
|
const size_t dec32table[] = {4-0, 4-3, 4-2, 4-3, 4-0, 4-0, 4-0, 4-0}; /* 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;*/
|
|
ref += dec32table[op-ref];
|
|
A32(op+4) = A32(ref);
|
|
op += STEPSIZE; 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
|
|
}
|
|
|