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updated xxhash source

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This commit is contained in:
Yann Collet
2016-01-05 01:44:36 +01:00
parent 96ffa424eb
commit 5835e1b5ba
4 changed files with 158 additions and 124 deletions
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programs/xxhash.h
+93 -59
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@@ -1,7 +1,7 @@
/*
xxHash - Extremely Fast Hash algorithm
Header File
Copyright (C) 2012-2015, Yann Collet.
Copyright (C) 2012-2016, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
@@ -71,34 +71,56 @@ extern "C" {
#endif
/*****************************
/* ****************************
* Definitions
*****************************/
******************************/
#include <stddef.h> /* size_t */
typedef enum { XXH_OK=0, XXH_ERROR } XXH_errorcode;
/*****************************
* Namespace Emulation
*****************************/
/* Motivations :
/* ****************************
* 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
If you need to include xxHash into your library,
but wish to avoid xxHash symbols to be present on your library interface
in an effort to avoid potential name collision if another library also includes xxHash,
/*!XXH_NAMESPACE, aka Namespace Emulation :
you can use XXH_NAMESPACE, which will automatically prefix any symbol from xxHash
with the value of XXH_NAMESPACE (so avoid to keep it NULL, and avoid numeric values).
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,
Note that no change is required within the calling program :
it can still call xxHash functions using their regular name.
They will be automatically translated by this header.
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)
@@ -112,63 +134,75 @@ They will be automatically translated by this header.
#endif
/*****************************
/* *************************************
* Version
***************************************/
#define XXH_VERSION_MAJOR 0 /* for breaking interface changes */
#define XXH_VERSION_MINOR 5 /* for new (non-breaking) interface capabilities */
#define XXH_VERSION_RELEASE 0 /* for tweaks, bug-fixes, or development */
#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
*****************************/
******************************/
unsigned int XXH32 (const void* input, size_t length, unsigned seed);
unsigned long long XXH64 (const void* input, size_t length, unsigned long long seed);
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.
This function successfully passes all SMHasher tests.
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".
Faster on 64-bits systems. Slower on 32-bits systems.
"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 { long long ll[ 6]; } XXH32_state_t;
typedef struct { long long ll[11]; } XXH64_state_t;
/*
These structures allow static allocation of XXH states.
States must then be initialized using XXHnn_reset() before first use.
If you prefer dynamic allocation, please refer to functions below.
*/
XXH32_state_t* XXH32_createState(void);
XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr);
XXH64_state_t* XXH64_createState(void);
XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr);
/*
These functions create and release memory for XXH state.
States must then be initialized using XXHnn_reset() before first use.
*/
******************************/
typedef struct XXH32_state_s XXH32_state_t; /* incomplete */
typedef struct XXH64_state_s XXH64_state_t; /* incomplete */
XXH_errorcode XXH32_reset (XXH32_state_t* statePtr, unsigned seed);
XXH_errorcode XXH32_update (XXH32_state_t* statePtr, const void* input, size_t length);
unsigned int XXH32_digest (const XXH32_state_t* statePtr);
/*!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;
XXH_errorcode XXH64_reset (XXH64_state_t* statePtr, unsigned long long seed);
XXH_errorcode XXH64_update (XXH64_state_t* statePtr, const void* input, size_t length);
unsigned long long XXH64_digest (const XXH64_state_t* statePtr);
#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 ; */
/*
These functions calculate the xxHash of an input provided in multiple smaller packets,
as opposed to an input provided as a single block.
/*!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 calculate the xxHash of an input provided in multiple segments,
as opposed to provided as a single block.
XXH state space must first be allocated, using either static or dynamic method provided above.
@@ -178,12 +212,12 @@ Then, feed the hash state by calling XXHnn_update() as many times as necessary.
Obviously, input must be valid, meaning allocated and read accessible.
The function returns an error code, with 0 meaning OK, and any other value meaning there is an error.
Finally, you can produce a hash anytime, by using XXHnn_digest().
This function returns the final nn-bits hash.
You can nonetheless continue feeding the hash state with more input,
and therefore get some new hashes, by calling again XXHnn_digest().
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 you are done, don't forget to free XXH state space, using typically XXHnn_freeState().
When you are done, don't forget to free XXH state space if it was allocated dynamically.
*/