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522 lines
16 KiB
522 lines
16 KiB
/*
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xxHash - Fast Hash algorithm
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Copyright (C) 2012-2014, 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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- xxHash source repository : http://code.google.com/p/xxhash/
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*/
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#include "archive_platform.h"
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#include <stdlib.h>
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#include <string.h>
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#include "archive_xxhash.h"
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#ifdef HAVE_LIBLZ4
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/***************************************
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** Tuning parameters
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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, the compiler will be more cautious, and insert extra code to ensure aligned access is respected.
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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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** You can also enable this parameter if you know your input data will always be aligned (boundaries of 4, for U32).
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*/
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#if defined(__ARM_FEATURE_UNALIGNED) || defined(__i386) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64)
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# define XXH_USE_UNALIGNED_ACCESS 1
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#endif
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/* XXH_ACCEPT_NULL_INPUT_POINTER :
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** If the input pointer is a null pointer, xxHash default behavior is to trigger a memory access error, since it is a bad pointer.
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** When this option is enabled, xxHash output for null input pointers will be the same as a null-length input.
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** This option has a very small performance cost (only measurable on small inputs).
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** By default, this option is disabled. To enable it, uncomment below define :
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** #define XXH_ACCEPT_NULL_INPUT_POINTER 1
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** XXH_FORCE_NATIVE_FORMAT :
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** By default, xxHash library provides endian-independent Hash values, based on little-endian convention.
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** Results are therefore identical for little-endian and big-endian CPU.
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** This comes at a performance cost for big-endian CPU, since some swapping is required to emulate little-endian format.
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** Should endian-independence be of no importance for your application, you may set the #define below to 1.
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** It will improve speed for Big-endian CPU.
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** This option has no impact on Little_Endian CPU.
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*/
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#define XXH_FORCE_NATIVE_FORMAT 0
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/***************************************
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** Compiler Specific Options
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****************************************/
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/* Disable some Visual warning messages */
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#ifdef _MSC_VER /* Visual Studio */
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# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
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#endif
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#ifdef _MSC_VER /* Visual Studio */
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# define FORCE_INLINE __forceinline
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#else
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# ifdef __GNUC__
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# define FORCE_INLINE inline __attribute__((always_inline))
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# else
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# define FORCE_INLINE inline
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# endif
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#endif
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/***************************************
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** Includes & Memory related functions
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****************************************/
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#define XXH_malloc malloc
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#define XXH_free free
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#define XXH_memcpy memcpy
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static unsigned int XXH32 (const void*, unsigned int, unsigned int);
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static void* XXH32_init (unsigned int);
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static XXH_errorcode XXH32_update (void*, const void*, unsigned int);
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static unsigned int XXH32_digest (void*);
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/*static int XXH32_sizeofState(void);*/
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static XXH_errorcode XXH32_resetState(void*, unsigned int);
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#define XXH32_SIZEOFSTATE 48
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typedef struct { long long ll[(XXH32_SIZEOFSTATE+(sizeof(long long)-1))/sizeof(long long)]; } XXH32_stateSpace_t;
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static unsigned int XXH32_intermediateDigest (void*);
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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(XXH_USE_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(XXH_USE_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 _U32_S { U32 v; } _PACKED U32_S;
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#if !defined(XXH_USE_UNALIGNED_ACCESS) && !defined(__GNUC__)
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# pragma pack(pop)
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#endif
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/****************************************
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** Compiler-specific Functions and Macros
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*****************************************/
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#define GCC_VERSION ((__GNUC__-0) * 100 + (__GNUC_MINOR__ - 0))
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#if GCC_VERSION >= 409
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__attribute__((__no_sanitize_undefined__))
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#endif
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static inline U32 A32(const void * x)
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{
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return (((const U32_S *)(x))->v);
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}
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/* Note : although _rotl exists for minGW (GCC under windows), performance seems poor */
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#if defined(_MSC_VER)
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# define XXH_rotl32(x,r) _rotl(x,r)
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#else
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# define XXH_rotl32(x,r) ((x << r) | (x >> (32 - r)))
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#endif
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#if defined(_MSC_VER) /* Visual Studio */
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# define XXH_swap32 _byteswap_ulong
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#elif GCC_VERSION >= 403
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# define XXH_swap32 __builtin_bswap32
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#else
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static inline U32 XXH_swap32 (U32 x) {
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return ((x << 24) & 0xff000000 ) |
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((x << 8) & 0x00ff0000 ) |
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((x >> 8) & 0x0000ff00 ) |
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((x >> 24) & 0x000000ff );}
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#endif
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/***************************************
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** Constants
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****************************************/
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#define PRIME32_1 2654435761U
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#define PRIME32_2 2246822519U
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#define PRIME32_3 3266489917U
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#define PRIME32_4 668265263U
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#define PRIME32_5 374761393U
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/***************************************
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** Architecture Macros
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****************************************/
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typedef enum { XXH_bigEndian=0, XXH_littleEndian=1 } XXH_endianess;
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#ifndef XXH_CPU_LITTLE_ENDIAN /* It is possible to define XXH_CPU_LITTLE_ENDIAN externally, for example using a compiler switch */
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static const int one = 1;
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# define XXH_CPU_LITTLE_ENDIAN (*(const char*)(&one))
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#endif
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/***************************************
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** Macros
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****************************************/
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#define XXH_STATIC_ASSERT(c) { enum { XXH_static_assert = 1/(!!(c)) }; } /* use only *after* variable declarations */
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/*****************************
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** Memory reads
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******************************/
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typedef enum { XXH_aligned, XXH_unaligned } XXH_alignment;
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static
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FORCE_INLINE U32 XXH_readLE32_align(const U32* ptr, XXH_endianess endian, XXH_alignment align)
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{
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if (align==XXH_unaligned)
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return endian==XXH_littleEndian ? A32(ptr) : XXH_swap32(A32(ptr));
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else
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return endian==XXH_littleEndian ? *ptr : XXH_swap32(*ptr);
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}
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static
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FORCE_INLINE U32 XXH_readLE32(const U32* ptr, XXH_endianess endian) { return XXH_readLE32_align(ptr, endian, XXH_unaligned); }
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/*****************************
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** Simple Hash Functions
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******************************/
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static
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FORCE_INLINE U32 XXH32_endian_align(const void* input, unsigned int len, U32 seed, XXH_endianess endian, XXH_alignment align)
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{
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const BYTE* p = (const BYTE*)input;
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const BYTE* bEnd = p + len;
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U32 h32;
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#define XXH_get32bits(p) XXH_readLE32_align((const U32*)p, endian, align)
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#ifdef XXH_ACCEPT_NULL_INPUT_POINTER
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if (p==NULL) { len=0; bEnd=p=(const BYTE*)(size_t)16; }
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#endif
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if (len>=16)
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{
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const BYTE* const limit = bEnd - 16;
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U32 v1 = seed + PRIME32_1 + PRIME32_2;
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U32 v2 = seed + PRIME32_2;
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U32 v3 = seed + 0;
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U32 v4 = seed - PRIME32_1;
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do
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{
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v1 += XXH_get32bits(p) * PRIME32_2; v1 = XXH_rotl32(v1, 13); v1 *= PRIME32_1; p+=4;
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v2 += XXH_get32bits(p) * PRIME32_2; v2 = XXH_rotl32(v2, 13); v2 *= PRIME32_1; p+=4;
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v3 += XXH_get32bits(p) * PRIME32_2; v3 = XXH_rotl32(v3, 13); v3 *= PRIME32_1; p+=4;
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v4 += XXH_get32bits(p) * PRIME32_2; v4 = XXH_rotl32(v4, 13); v4 *= PRIME32_1; p+=4;
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} while (p<=limit);
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h32 = XXH_rotl32(v1, 1) + XXH_rotl32(v2, 7) + XXH_rotl32(v3, 12) + XXH_rotl32(v4, 18);
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}
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else
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{
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h32 = seed + PRIME32_5;
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}
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h32 += (U32) len;
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while (p<=bEnd-4)
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{
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h32 += XXH_get32bits(p) * PRIME32_3;
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h32 = XXH_rotl32(h32, 17) * PRIME32_4 ;
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p+=4;
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}
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while (p<bEnd)
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{
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h32 += (*p) * PRIME32_5;
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h32 = XXH_rotl32(h32, 11) * PRIME32_1 ;
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p++;
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}
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h32 ^= h32 >> 15;
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h32 *= PRIME32_2;
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h32 ^= h32 >> 13;
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h32 *= PRIME32_3;
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h32 ^= h32 >> 16;
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return h32;
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}
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U32 XXH32(const void* input, unsigned int len, U32 seed)
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{
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#if 0
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// Simple version, good for code maintenance, but unfortunately slow for small inputs
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void* state = XXH32_init(seed);
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XXH32_update(state, input, len);
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return XXH32_digest(state);
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#else
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XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
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# if !defined(XXH_USE_UNALIGNED_ACCESS)
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if ((((size_t)input) & 3) == 0) /* Input is aligned, let's leverage the speed advantage */
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{
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if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
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return XXH32_endian_align(input, len, seed, XXH_littleEndian, XXH_aligned);
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else
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return XXH32_endian_align(input, len, seed, XXH_bigEndian, XXH_aligned);
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}
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# endif
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if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
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return XXH32_endian_align(input, len, seed, XXH_littleEndian, XXH_unaligned);
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else
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return XXH32_endian_align(input, len, seed, XXH_bigEndian, XXH_unaligned);
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#endif
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}
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/*****************************
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** Advanced Hash Functions
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******************************/
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struct XXH_state32_t
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{
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U64 total_len;
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U32 seed;
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U32 v1;
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U32 v2;
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U32 v3;
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U32 v4;
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int memsize;
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char memory[16];
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};
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#if 0
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static
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int XXH32_sizeofState(void)
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{
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XXH_STATIC_ASSERT(XXH32_SIZEOFSTATE >= sizeof(struct XXH_state32_t)); /* A compilation error here means XXH32_SIZEOFSTATE is not large enough */
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return sizeof(struct XXH_state32_t);
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}
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#endif
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static
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XXH_errorcode XXH32_resetState(void* state_in, U32 seed)
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{
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struct XXH_state32_t * state = (struct XXH_state32_t *) state_in;
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state->seed = seed;
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state->v1 = seed + PRIME32_1 + PRIME32_2;
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state->v2 = seed + PRIME32_2;
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state->v3 = seed + 0;
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state->v4 = seed - PRIME32_1;
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state->total_len = 0;
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state->memsize = 0;
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return XXH_OK;
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}
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static
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void* XXH32_init (U32 seed)
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{
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void* state = XXH_malloc (sizeof(struct XXH_state32_t));
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XXH32_resetState(state, seed);
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return state;
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}
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static
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FORCE_INLINE XXH_errorcode XXH32_update_endian (void* state_in, const void* input, int len, XXH_endianess endian)
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{
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struct XXH_state32_t * state = (struct XXH_state32_t *) state_in;
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const BYTE* p = (const BYTE*)input;
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const BYTE* const bEnd = p + len;
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#ifdef XXH_ACCEPT_NULL_INPUT_POINTER
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if (input==NULL) return XXH_ERROR;
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#endif
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state->total_len += len;
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if (state->memsize + len < 16) /* fill in tmp buffer */
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{
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XXH_memcpy(state->memory + state->memsize, input, len);
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state->memsize += len;
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return XXH_OK;
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}
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if (state->memsize) /* some data left from previous update */
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{
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XXH_memcpy(state->memory + state->memsize, input, 16-state->memsize);
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{
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const U32* p32 = (const U32*)state->memory;
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state->v1 += XXH_readLE32(p32, endian) * PRIME32_2; state->v1 = XXH_rotl32(state->v1, 13); state->v1 *= PRIME32_1; p32++;
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state->v2 += XXH_readLE32(p32, endian) * PRIME32_2; state->v2 = XXH_rotl32(state->v2, 13); state->v2 *= PRIME32_1; p32++;
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state->v3 += XXH_readLE32(p32, endian) * PRIME32_2; state->v3 = XXH_rotl32(state->v3, 13); state->v3 *= PRIME32_1; p32++;
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state->v4 += XXH_readLE32(p32, endian) * PRIME32_2; state->v4 = XXH_rotl32(state->v4, 13); state->v4 *= PRIME32_1; p32++;
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}
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p += 16-state->memsize;
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state->memsize = 0;
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}
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if (p <= bEnd-16)
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{
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const BYTE* const limit = bEnd - 16;
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U32 v1 = state->v1;
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U32 v2 = state->v2;
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U32 v3 = state->v3;
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U32 v4 = state->v4;
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do
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{
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v1 += XXH_readLE32((const U32*)p, endian) * PRIME32_2; v1 = XXH_rotl32(v1, 13); v1 *= PRIME32_1; p+=4;
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v2 += XXH_readLE32((const U32*)p, endian) * PRIME32_2; v2 = XXH_rotl32(v2, 13); v2 *= PRIME32_1; p+=4;
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v3 += XXH_readLE32((const U32*)p, endian) * PRIME32_2; v3 = XXH_rotl32(v3, 13); v3 *= PRIME32_1; p+=4;
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v4 += XXH_readLE32((const U32*)p, endian) * PRIME32_2; v4 = XXH_rotl32(v4, 13); v4 *= PRIME32_1; p+=4;
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} while (p<=limit);
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state->v1 = v1;
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state->v2 = v2;
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state->v3 = v3;
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state->v4 = v4;
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}
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if (p < bEnd)
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{
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XXH_memcpy(state->memory, p, bEnd-p);
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state->memsize = (int)(bEnd-p);
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}
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return XXH_OK;
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}
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static
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XXH_errorcode XXH32_update (void* state_in, const void* input, unsigned int len)
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{
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XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
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if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
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return XXH32_update_endian(state_in, input, len, XXH_littleEndian);
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else
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return XXH32_update_endian(state_in, input, len, XXH_bigEndian);
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}
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static
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FORCE_INLINE U32 XXH32_intermediateDigest_endian (void* state_in, XXH_endianess endian)
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{
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struct XXH_state32_t * state = (struct XXH_state32_t *) state_in;
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const BYTE * p = (const BYTE*)state->memory;
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BYTE* bEnd = (BYTE*)state->memory + state->memsize;
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U32 h32;
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if (state->total_len >= 16)
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{
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h32 = XXH_rotl32(state->v1, 1) + XXH_rotl32(state->v2, 7) + XXH_rotl32(state->v3, 12) + XXH_rotl32(state->v4, 18);
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}
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else
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{
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h32 = state->seed + PRIME32_5;
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}
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h32 += (U32) state->total_len;
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while (p<=bEnd-4)
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{
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h32 += XXH_readLE32((const U32*)p, endian) * PRIME32_3;
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h32 = XXH_rotl32(h32, 17) * PRIME32_4;
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p+=4;
|
|
}
|
|
|
|
while (p<bEnd)
|
|
{
|
|
h32 += (*p) * PRIME32_5;
|
|
h32 = XXH_rotl32(h32, 11) * PRIME32_1;
|
|
p++;
|
|
}
|
|
|
|
h32 ^= h32 >> 15;
|
|
h32 *= PRIME32_2;
|
|
h32 ^= h32 >> 13;
|
|
h32 *= PRIME32_3;
|
|
h32 ^= h32 >> 16;
|
|
|
|
return h32;
|
|
}
|
|
|
|
static
|
|
U32 XXH32_intermediateDigest (void* state_in)
|
|
{
|
|
XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
|
|
|
|
if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
|
|
return XXH32_intermediateDigest_endian(state_in, XXH_littleEndian);
|
|
else
|
|
return XXH32_intermediateDigest_endian(state_in, XXH_bigEndian);
|
|
}
|
|
|
|
static
|
|
U32 XXH32_digest (void* state_in)
|
|
{
|
|
U32 h32 = XXH32_intermediateDigest(state_in);
|
|
|
|
XXH_free(state_in);
|
|
|
|
return h32;
|
|
}
|
|
|
|
const
|
|
struct archive_xxhash __archive_xxhash = {
|
|
XXH32,
|
|
XXH32_init,
|
|
XXH32_update,
|
|
XXH32_digest
|
|
};
|
|
#else
|
|
|
|
/*
|
|
* Define an empty version of the struct if we aren't using the LZ4 library.
|
|
*/
|
|
const
|
|
struct archive_xxhash __archive_xxhash = {
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
#endif /* HAVE_LIBLZ4 */
|