fork of https://github.com/rust-rocksdb/rust-rocksdb for nextgraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
328 lines
13 KiB
328 lines
13 KiB
/*
|
|
xxHash - Extremely Fast Hash algorithm
|
|
Header File
|
|
Copyright (C) 2012-2016, Yann Collet.
|
|
|
|
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above
|
|
copyright notice, this list of conditions and the following disclaimer
|
|
in the documentation and/or other materials provided with the
|
|
distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
You can contact the author at :
|
|
- xxHash source repository : https://github.com/Cyan4973/xxHash
|
|
*/
|
|
|
|
/* Notice extracted from xxHash homepage :
|
|
|
|
xxHash is an extremely fast Hash algorithm, running at RAM speed limits.
|
|
It also successfully passes all tests from the SMHasher suite.
|
|
|
|
Comparison (single thread, Windows Seven 32 bits, using SMHasher on a Core 2 Duo @3GHz)
|
|
|
|
Name Speed Q.Score Author
|
|
xxHash 5.4 GB/s 10
|
|
CrapWow 3.2 GB/s 2 Andrew
|
|
MumurHash 3a 2.7 GB/s 10 Austin Appleby
|
|
SpookyHash 2.0 GB/s 10 Bob Jenkins
|
|
SBox 1.4 GB/s 9 Bret Mulvey
|
|
Lookup3 1.2 GB/s 9 Bob Jenkins
|
|
SuperFastHash 1.2 GB/s 1 Paul Hsieh
|
|
CityHash64 1.05 GB/s 10 Pike & Alakuijala
|
|
FNV 0.55 GB/s 5 Fowler, Noll, Vo
|
|
CRC32 0.43 GB/s 9
|
|
MD5-32 0.33 GB/s 10 Ronald L. Rivest
|
|
SHA1-32 0.28 GB/s 10
|
|
|
|
Q.Score is a measure of quality of the hash function.
|
|
It depends on successfully passing SMHasher test set.
|
|
10 is a perfect score.
|
|
|
|
A 64-bit version, named XXH64, is available since r35.
|
|
It offers much better speed, but for 64-bit applications only.
|
|
Name Speed on 64 bits Speed on 32 bits
|
|
XXH64 13.8 GB/s 1.9 GB/s
|
|
XXH32 6.8 GB/s 6.0 GB/s
|
|
*/
|
|
|
|
#ifndef XXHASH_H_5627135585666179
|
|
#define XXHASH_H_5627135585666179 1
|
|
|
|
#if defined (__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
/* ****************************
|
|
* Definitions
|
|
******************************/
|
|
#include <stddef.h> /* size_t */
|
|
typedef enum { XXH_OK=0, XXH_ERROR } XXH_errorcode;
|
|
|
|
|
|
/* ****************************
|
|
* API modifier
|
|
******************************/
|
|
/** XXH_INLINE_ALL (and XXH_PRIVATE_API)
|
|
* This is useful to include xxhash functions in `static` mode
|
|
* in order to inline them, and remove their symbol from the public list.
|
|
* Inlining can offer dramatic performance improvement on small keys.
|
|
* Methodology :
|
|
* #define XXH_INLINE_ALL
|
|
* #include "xxhash.h"
|
|
* `xxhash.c` is automatically included.
|
|
* It's not useful to compile and link it as a separate module.
|
|
*/
|
|
#if defined(XXH_INLINE_ALL) || defined(XXH_PRIVATE_API)
|
|
# ifndef XXH_STATIC_LINKING_ONLY
|
|
# define XXH_STATIC_LINKING_ONLY
|
|
# endif
|
|
# if defined(__GNUC__)
|
|
# define XXH_PUBLIC_API static __inline __attribute__((unused))
|
|
# elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
|
|
# define XXH_PUBLIC_API static inline
|
|
# elif defined(_MSC_VER)
|
|
# define XXH_PUBLIC_API static __inline
|
|
# else
|
|
/* this version may generate warnings for unused static functions */
|
|
# define XXH_PUBLIC_API static
|
|
# endif
|
|
#else
|
|
# define XXH_PUBLIC_API /* do nothing */
|
|
#endif /* XXH_INLINE_ALL || XXH_PRIVATE_API */
|
|
|
|
/*! XXH_NAMESPACE, aka Namespace Emulation :
|
|
*
|
|
* If you want to include _and expose_ xxHash functions from within your own library,
|
|
* but also want to avoid symbol collisions with other libraries which may also include xxHash,
|
|
*
|
|
* you can use XXH_NAMESPACE, to automatically prefix any public symbol from xxhash library
|
|
* with the value of XXH_NAMESPACE (therefore, avoid NULL and numeric values).
|
|
*
|
|
* Note that no change is required within the calling program as long as it includes `xxhash.h` :
|
|
* regular symbol name will be automatically translated by this header.
|
|
*/
|
|
#ifdef XXH_NAMESPACE
|
|
# define XXH_CAT(A,B) A##B
|
|
# define XXH_NAME2(A,B) XXH_CAT(A,B)
|
|
# define XXH_versionNumber XXH_NAME2(XXH_NAMESPACE, XXH_versionNumber)
|
|
# define XXH32 XXH_NAME2(XXH_NAMESPACE, XXH32)
|
|
# define XXH32_createState XXH_NAME2(XXH_NAMESPACE, XXH32_createState)
|
|
# define XXH32_freeState XXH_NAME2(XXH_NAMESPACE, XXH32_freeState)
|
|
# define XXH32_reset XXH_NAME2(XXH_NAMESPACE, XXH32_reset)
|
|
# define XXH32_update XXH_NAME2(XXH_NAMESPACE, XXH32_update)
|
|
# define XXH32_digest XXH_NAME2(XXH_NAMESPACE, XXH32_digest)
|
|
# define XXH32_copyState XXH_NAME2(XXH_NAMESPACE, XXH32_copyState)
|
|
# define XXH32_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH32_canonicalFromHash)
|
|
# define XXH32_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH32_hashFromCanonical)
|
|
# define XXH64 XXH_NAME2(XXH_NAMESPACE, XXH64)
|
|
# define XXH64_createState XXH_NAME2(XXH_NAMESPACE, XXH64_createState)
|
|
# define XXH64_freeState XXH_NAME2(XXH_NAMESPACE, XXH64_freeState)
|
|
# define XXH64_reset XXH_NAME2(XXH_NAMESPACE, XXH64_reset)
|
|
# define XXH64_update XXH_NAME2(XXH_NAMESPACE, XXH64_update)
|
|
# define XXH64_digest XXH_NAME2(XXH_NAMESPACE, XXH64_digest)
|
|
# define XXH64_copyState XXH_NAME2(XXH_NAMESPACE, XXH64_copyState)
|
|
# define XXH64_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH64_canonicalFromHash)
|
|
# define XXH64_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH64_hashFromCanonical)
|
|
#endif
|
|
|
|
|
|
/* *************************************
|
|
* Version
|
|
***************************************/
|
|
#define XXH_VERSION_MAJOR 0
|
|
#define XXH_VERSION_MINOR 6
|
|
#define XXH_VERSION_RELEASE 5
|
|
#define XXH_VERSION_NUMBER (XXH_VERSION_MAJOR *100*100 + XXH_VERSION_MINOR *100 + XXH_VERSION_RELEASE)
|
|
XXH_PUBLIC_API unsigned XXH_versionNumber (void);
|
|
|
|
|
|
/*-**********************************************************************
|
|
* 32-bit hash
|
|
************************************************************************/
|
|
typedef unsigned int XXH32_hash_t;
|
|
|
|
/*! XXH32() :
|
|
Calculate the 32-bit hash of sequence "length" bytes stored at memory address "input".
|
|
The memory between input & input+length must be valid (allocated and read-accessible).
|
|
"seed" can be used to alter the result predictably.
|
|
Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark) : 5.4 GB/s */
|
|
XXH_PUBLIC_API XXH32_hash_t XXH32 (const void* input, size_t length, unsigned int seed);
|
|
|
|
/*====== Streaming ======*/
|
|
typedef struct XXH32_state_s XXH32_state_t; /* incomplete type */
|
|
XXH_PUBLIC_API XXH32_state_t* XXH32_createState(void);
|
|
XXH_PUBLIC_API XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr);
|
|
XXH_PUBLIC_API void XXH32_copyState(XXH32_state_t* dst_state, const XXH32_state_t* src_state);
|
|
|
|
XXH_PUBLIC_API XXH_errorcode XXH32_reset (XXH32_state_t* statePtr, unsigned int seed);
|
|
XXH_PUBLIC_API XXH_errorcode XXH32_update (XXH32_state_t* statePtr, const void* input, size_t length);
|
|
XXH_PUBLIC_API XXH32_hash_t XXH32_digest (const XXH32_state_t* statePtr);
|
|
|
|
/*
|
|
* Streaming functions generate the xxHash of an input provided in multiple segments.
|
|
* Note that, for small input, they are slower than single-call functions, due to state management.
|
|
* For small inputs, prefer `XXH32()` and `XXH64()`, which are better optimized.
|
|
*
|
|
* XXH state must first be allocated, using XXH*_createState() .
|
|
*
|
|
* Start a new hash by initializing state with a seed, using XXH*_reset().
|
|
*
|
|
* Then, feed the hash state by calling XXH*_update() as many times as necessary.
|
|
* The function returns an error code, with 0 meaning OK, and any other value meaning there is an error.
|
|
*
|
|
* Finally, a hash value can be produced anytime, by using XXH*_digest().
|
|
* This function returns the nn-bits hash as an int or long long.
|
|
*
|
|
* It's still possible to continue inserting input into the hash state after a digest,
|
|
* and generate some new hashes later on, by calling again XXH*_digest().
|
|
*
|
|
* When done, free XXH state space if it was allocated dynamically.
|
|
*/
|
|
|
|
/*====== Canonical representation ======*/
|
|
|
|
typedef struct { unsigned char digest[4]; } XXH32_canonical_t;
|
|
XXH_PUBLIC_API void XXH32_canonicalFromHash(XXH32_canonical_t* dst, XXH32_hash_t hash);
|
|
XXH_PUBLIC_API XXH32_hash_t XXH32_hashFromCanonical(const XXH32_canonical_t* src);
|
|
|
|
/* Default result type for XXH functions are primitive unsigned 32 and 64 bits.
|
|
* The canonical representation uses human-readable write convention, aka big-endian (large digits first).
|
|
* These functions allow transformation of hash result into and from its canonical format.
|
|
* This way, hash values can be written into a file / memory, and remain comparable on different systems and programs.
|
|
*/
|
|
|
|
|
|
#ifndef XXH_NO_LONG_LONG
|
|
/*-**********************************************************************
|
|
* 64-bit hash
|
|
************************************************************************/
|
|
typedef unsigned long long XXH64_hash_t;
|
|
|
|
/*! XXH64() :
|
|
Calculate the 64-bit hash of sequence of length "len" stored at memory address "input".
|
|
"seed" can be used to alter the result predictably.
|
|
This function runs faster on 64-bit systems, but slower on 32-bit systems (see benchmark).
|
|
*/
|
|
XXH_PUBLIC_API XXH64_hash_t XXH64 (const void* input, size_t length, unsigned long long seed);
|
|
|
|
/*====== Streaming ======*/
|
|
typedef struct XXH64_state_s XXH64_state_t; /* incomplete type */
|
|
XXH_PUBLIC_API XXH64_state_t* XXH64_createState(void);
|
|
XXH_PUBLIC_API XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr);
|
|
XXH_PUBLIC_API void XXH64_copyState(XXH64_state_t* dst_state, const XXH64_state_t* src_state);
|
|
|
|
XXH_PUBLIC_API XXH_errorcode XXH64_reset (XXH64_state_t* statePtr, unsigned long long seed);
|
|
XXH_PUBLIC_API XXH_errorcode XXH64_update (XXH64_state_t* statePtr, const void* input, size_t length);
|
|
XXH_PUBLIC_API XXH64_hash_t XXH64_digest (const XXH64_state_t* statePtr);
|
|
|
|
/*====== Canonical representation ======*/
|
|
typedef struct { unsigned char digest[8]; } XXH64_canonical_t;
|
|
XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t hash);
|
|
XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src);
|
|
#endif /* XXH_NO_LONG_LONG */
|
|
|
|
|
|
|
|
#ifdef XXH_STATIC_LINKING_ONLY
|
|
|
|
/* ================================================================================================
|
|
This section contains declarations which are not guaranteed to remain stable.
|
|
They may change in future versions, becoming incompatible with a different version of the library.
|
|
These declarations should only be used with static linking.
|
|
Never use them in association with dynamic linking !
|
|
=================================================================================================== */
|
|
|
|
/* These definitions are only present to allow
|
|
* static allocation of XXH state, on stack or in a struct for example.
|
|
* Never **ever** use members directly. */
|
|
|
|
#if !defined (__VMS) \
|
|
&& (defined (__cplusplus) \
|
|
|| (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
|
|
# include <stdint.h>
|
|
|
|
struct XXH32_state_s {
|
|
uint32_t total_len_32;
|
|
uint32_t large_len;
|
|
uint32_t v1;
|
|
uint32_t v2;
|
|
uint32_t v3;
|
|
uint32_t v4;
|
|
uint32_t mem32[4];
|
|
uint32_t memsize;
|
|
uint32_t reserved; /* never read nor write, might be removed in a future version */
|
|
}; /* typedef'd to XXH32_state_t */
|
|
|
|
struct XXH64_state_s {
|
|
uint64_t total_len;
|
|
uint64_t v1;
|
|
uint64_t v2;
|
|
uint64_t v3;
|
|
uint64_t v4;
|
|
uint64_t mem64[4];
|
|
uint32_t memsize;
|
|
uint32_t reserved[2]; /* never read nor write, might be removed in a future version */
|
|
}; /* typedef'd to XXH64_state_t */
|
|
|
|
# else
|
|
|
|
struct XXH32_state_s {
|
|
unsigned total_len_32;
|
|
unsigned large_len;
|
|
unsigned v1;
|
|
unsigned v2;
|
|
unsigned v3;
|
|
unsigned v4;
|
|
unsigned mem32[4];
|
|
unsigned memsize;
|
|
unsigned reserved; /* never read nor write, might be removed in a future version */
|
|
}; /* typedef'd to XXH32_state_t */
|
|
|
|
# ifndef XXH_NO_LONG_LONG /* remove 64-bit support */
|
|
struct XXH64_state_s {
|
|
unsigned long long total_len;
|
|
unsigned long long v1;
|
|
unsigned long long v2;
|
|
unsigned long long v3;
|
|
unsigned long long v4;
|
|
unsigned long long mem64[4];
|
|
unsigned memsize;
|
|
unsigned reserved[2]; /* never read nor write, might be removed in a future version */
|
|
}; /* typedef'd to XXH64_state_t */
|
|
# endif
|
|
|
|
# endif
|
|
|
|
|
|
#if defined(XXH_INLINE_ALL) || defined(XXH_PRIVATE_API)
|
|
# include "xxhash.c" /* include xxhash function bodies as `static`, for inlining */
|
|
#endif
|
|
|
|
#endif /* XXH_STATIC_LINKING_ONLY */
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* XXHASH_H_5627135585666179 */
|
|
|