mirror of
https://github.com/ZDoom/Raze.git
synced 2024-12-15 07:01:15 +00:00
229 lines
9.2 KiB
C
229 lines
9.2 KiB
C
/*
|
|
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-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
|
|
*/
|
|
|
|
#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_PRIVATE_API
|
|
* Transforms all publics symbols within `xxhash.c` into private ones.
|
|
* Methodology :
|
|
* instead of : #include "xxhash.h"
|
|
* do :
|
|
* #define XXH_PRIVATE_API
|
|
* #include "xxhash.c" // note the .c , instead of .h
|
|
* also : don't compile and link xxhash.c separately
|
|
*/
|
|
#ifdef XXH_PRIVATE_API
|
|
# if defined(__GNUC__)
|
|
# define XXH_PUBLIC_API static __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_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.c`
|
|
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 also 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)
|
|
#endif
|
|
|
|
|
|
/* *************************************
|
|
* Version
|
|
***************************************/
|
|
#define XXH_VERSION_MAJOR 0
|
|
#define XXH_VERSION_MINOR 5
|
|
#define XXH_VERSION_RELEASE 0
|
|
#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
|
|
******************************/
|
|
|
|
XXH_PUBLIC_API unsigned int XXH32 (const void* input, size_t length, unsigned int seed);
|
|
XXH_PUBLIC_API unsigned long long 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 faster on 64-bits systems, but slower on 32-bits systems (see benchmark).
|
|
*/
|
|
|
|
|
|
/* ****************************
|
|
* Advanced Hash Functions
|
|
******************************/
|
|
typedef struct XXH32_state_s XXH32_state_t; /* incomplete */
|
|
typedef struct XXH64_state_s XXH64_state_t; /* incomplete */
|
|
|
|
|
|
/*!Static allocation
|
|
For static linking only, do not use in the context of DLL ! */
|
|
typedef struct { long long ll[ 6]; } XXH32_stateBody_t;
|
|
typedef struct { long long ll[11]; } XXH64_stateBody_t;
|
|
|
|
#define XXH32_CREATESTATE_STATIC(name) XXH32_stateBody_t name##xxhbody; void* name##xxhvoid = &(name##xxhbody); XXH32_state_t* name = (XXH32_state_t*)(name##xxhvoid) /* no final ; */
|
|
#define XXH64_CREATESTATE_STATIC(name) XXH64_stateBody_t name##xxhbody; void* name##xxhvoid = &(name##xxhbody); XXH64_state_t* name = (XXH64_state_t*)(name##xxhvoid) /* no final ; */
|
|
|
|
|
|
/*!Dynamic allocation
|
|
To be preferred in the context of DLL */
|
|
|
|
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 unsigned int 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 unsigned long long XXH64_digest (const XXH64_state_t* statePtr);
|
|
|
|
/*!
|
|
These functions generate the xxHash of an input provided in multiple segments,
|
|
as opposed to provided as a single block.
|
|
|
|
XXH state must first be allocated, using either static or dynamic method provided above.
|
|
|
|
Start a new hash by initializing state with a seed, using XXHnn_reset().
|
|
|
|
Then, feed the hash state by calling XXHnn_update() as many times as necessary.
|
|
Obviously, input must be valid, hence 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 XXHnn_digest().
|
|
This function returns the nn-bits hash.
|
|
It's nonetheless possible to continue inserting input into the hash state
|
|
and later on generate some new hashes, by calling again XXHnn_digest().
|
|
|
|
When done, free XXH state space if it was allocated dynamically.
|
|
*/
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* XXHASH_H_5627135585666179 */
|