d085385e60
Release notes: https://github.com/facebook/zstd/releases/tag/v1.5.0
(cherry picked from commit 5bea1370f0)
285 lines
11 KiB
C++
285 lines
11 KiB
C++
/*
|
|
* xxHash - Extremely Fast Hash algorithm
|
|
* Header File
|
|
* Copyright (c) Yann Collet, Facebook, Inc.
|
|
*
|
|
* You can contact the author at :
|
|
* - xxHash source repository : https://github.com/Cyan4973/xxHash
|
|
*
|
|
* This source code is licensed under both the BSD-style license (found in the
|
|
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
|
|
* in the COPYING file in the root directory of this source tree).
|
|
* You may select, at your option, one of the above-listed licenses.
|
|
*/
|
|
|
|
/* 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-bits version, named XXH64, is available since r35.
|
|
It offers much better speed, but for 64-bits 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
|
|
*/
|
|
|
|
#if defined (__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
#ifndef XXHASH_H_5627135585666179
|
|
#define XXHASH_H_5627135585666179 1
|
|
|
|
|
|
/* ****************************
|
|
* Definitions
|
|
******************************/
|
|
#include "zstd_deps.h"
|
|
typedef enum { XXH_OK=0, XXH_ERROR } XXH_errorcode;
|
|
|
|
|
|
/* ****************************
|
|
* API modifier
|
|
******************************/
|
|
/** XXH_PRIVATE_API
|
|
* This is useful if you want to include xxhash functions in `static` mode
|
|
* in order to inline them, and remove their symbol from the public list.
|
|
* Methodology :
|
|
* #define XXH_PRIVATE_API
|
|
* #include "xxhash.h"
|
|
* `xxhash.c` is automatically included.
|
|
* It's not useful to compile and link it as a separate module anymore.
|
|
*/
|
|
#ifdef 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
|
|
# define XXH_PUBLIC_API static /* this version may generate warnings for unused static functions; disable the relevant warning */
|
|
# endif
|
|
#else
|
|
# define XXH_PUBLIC_API /* do nothing */
|
|
#endif /* 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 another library which also includes xxHash,
|
|
|
|
you can use XXH_NAMESPACE, to automatically prefix any public symbol from xxhash library
|
|
with the value of XXH_NAMESPACE (so avoid to keep it NULL and avoid 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 XXH32 XXH_NAME2(XXH_NAMESPACE, XXH32)
|
|
# define XXH64 XXH_NAME2(XXH_NAMESPACE, XXH64)
|
|
# define XXH_versionNumber XXH_NAME2(XXH_NAMESPACE, XXH_versionNumber)
|
|
# define XXH32_createState XXH_NAME2(XXH_NAMESPACE, XXH32_createState)
|
|
# define XXH64_createState XXH_NAME2(XXH_NAMESPACE, XXH64_createState)
|
|
# define XXH32_freeState XXH_NAME2(XXH_NAMESPACE, XXH32_freeState)
|
|
# define XXH64_freeState XXH_NAME2(XXH_NAMESPACE, XXH64_freeState)
|
|
# define XXH32_reset XXH_NAME2(XXH_NAMESPACE, XXH32_reset)
|
|
# define XXH64_reset XXH_NAME2(XXH_NAMESPACE, XXH64_reset)
|
|
# define XXH32_update XXH_NAME2(XXH_NAMESPACE, XXH32_update)
|
|
# define XXH64_update XXH_NAME2(XXH_NAMESPACE, XXH64_update)
|
|
# define XXH32_digest XXH_NAME2(XXH_NAMESPACE, XXH32_digest)
|
|
# define XXH64_digest XXH_NAME2(XXH_NAMESPACE, XXH64_digest)
|
|
# define XXH32_copyState XXH_NAME2(XXH_NAMESPACE, XXH32_copyState)
|
|
# define XXH64_copyState XXH_NAME2(XXH_NAMESPACE, XXH64_copyState)
|
|
# define XXH32_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH32_canonicalFromHash)
|
|
# define XXH64_canonicalFromHash XXH_NAME2(XXH_NAMESPACE, XXH64_canonicalFromHash)
|
|
# define XXH32_hashFromCanonical XXH_NAME2(XXH_NAMESPACE, XXH32_hashFromCanonical)
|
|
# 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 2
|
|
#define XXH_VERSION_NUMBER (XXH_VERSION_MAJOR *100*100 + XXH_VERSION_MINOR *100 + XXH_VERSION_RELEASE)
|
|
XXH_PUBLIC_API unsigned XXH_versionNumber (void);
|
|
|
|
|
|
/* ****************************
|
|
* Simple Hash Functions
|
|
******************************/
|
|
typedef unsigned int XXH32_hash_t;
|
|
typedef unsigned long long XXH64_hash_t;
|
|
|
|
XXH_PUBLIC_API XXH32_hash_t XXH32 (const void* input, size_t length, unsigned int seed);
|
|
XXH_PUBLIC_API XXH64_hash_t XXH64 (const void* input, size_t length, unsigned long long seed);
|
|
|
|
/*!
|
|
XXH32() :
|
|
Calculate the 32-bits 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
|
|
XXH64() :
|
|
Calculate the 64-bits hash of sequence of length "len" stored at memory address "input".
|
|
"seed" can be used to alter the result predictably.
|
|
This function runs 2x faster on 64-bits systems, but slower on 32-bits systems (see benchmark).
|
|
*/
|
|
|
|
|
|
/* ****************************
|
|
* Streaming Hash Functions
|
|
******************************/
|
|
typedef struct XXH32_state_s XXH32_state_t; /* incomplete type */
|
|
typedef struct XXH64_state_s XXH64_state_t; /* incomplete type */
|
|
|
|
/*! State allocation, compatible with dynamic libraries */
|
|
|
|
XXH_PUBLIC_API XXH32_state_t* XXH32_createState(void);
|
|
XXH_PUBLIC_API XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr);
|
|
|
|
XXH_PUBLIC_API XXH64_state_t* XXH64_createState(void);
|
|
XXH_PUBLIC_API XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr);
|
|
|
|
|
|
/* hash streaming */
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
/*
|
|
These 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 input, prefer `XXH32()` and `XXH64()` .
|
|
|
|
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.
|
|
Obviously, input must be allocated and read accessible.
|
|
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.
|
|
*/
|
|
|
|
|
|
/* **************************
|
|
* Utils
|
|
****************************/
|
|
#if !(defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) /* ! C99 */
|
|
# define restrict /* disable restrict */
|
|
#endif
|
|
|
|
XXH_PUBLIC_API void XXH32_copyState(XXH32_state_t* restrict dst_state, const XXH32_state_t* restrict src_state);
|
|
XXH_PUBLIC_API void XXH64_copyState(XXH64_state_t* restrict dst_state, const XXH64_state_t* restrict src_state);
|
|
|
|
|
|
/* **************************
|
|
* Canonical representation
|
|
****************************/
|
|
/* 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.
|
|
*/
|
|
typedef struct { unsigned char digest[4]; } XXH32_canonical_t;
|
|
typedef struct { unsigned char digest[8]; } XXH64_canonical_t;
|
|
|
|
XXH_PUBLIC_API void XXH32_canonicalFromHash(XXH32_canonical_t* dst, XXH32_hash_t hash);
|
|
XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t hash);
|
|
|
|
XXH_PUBLIC_API XXH32_hash_t XXH32_hashFromCanonical(const XXH32_canonical_t* src);
|
|
XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src);
|
|
|
|
#endif /* XXHASH_H_5627135585666179 */
|
|
|
|
|
|
|
|
/* ================================================================================================
|
|
This section contains definitions which are not guaranteed to remain stable.
|
|
They may change in future versions, becoming incompatible with a different version of the library.
|
|
They shall only be used with static linking.
|
|
Never use these definitions in association with dynamic linking !
|
|
=================================================================================================== */
|
|
#if defined(XXH_STATIC_LINKING_ONLY) && !defined(XXH_STATIC_H_3543687687345)
|
|
#define XXH_STATIC_H_3543687687345
|
|
|
|
/* These definitions are only meant to allow allocation of XXH state
|
|
statically, on stack, or in a struct for example.
|
|
Do not use members directly. */
|
|
|
|
struct XXH32_state_s {
|
|
unsigned total_len_32;
|
|
unsigned large_len;
|
|
unsigned v1;
|
|
unsigned v2;
|
|
unsigned v3;
|
|
unsigned v4;
|
|
unsigned mem32[4]; /* buffer defined as U32 for alignment */
|
|
unsigned memsize;
|
|
unsigned reserved; /* never read nor write, will be removed in a future version */
|
|
}; /* typedef'd to XXH32_state_t */
|
|
|
|
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]; /* buffer defined as U64 for alignment */
|
|
unsigned memsize;
|
|
unsigned reserved[2]; /* never read nor write, will be removed in a future version */
|
|
}; /* typedef'd to XXH64_state_t */
|
|
|
|
|
|
# ifdef XXH_PRIVATE_API
|
|
# include "xxhash.c" /* include xxhash functions as `static`, for inlining */
|
|
# endif
|
|
|
|
#endif /* XXH_STATIC_LINKING_ONLY && XXH_STATIC_H_3543687687345 */
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|