mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-12-27 11:38:58 +06:00
251 lines
7.4 KiB
C
251 lines
7.4 KiB
C
/*
|
|
* fnv - Fowler/Noll/Vo- hash code
|
|
*
|
|
* @(#) $Revision: 5.4 $
|
|
* @(#) $Id: fnv.h,v 5.4 2009/07/30 22:49:13 chongo Exp $
|
|
* @(#) $Source: /usr/local/src/cmd/fnv/RCS/fnv.h,v $
|
|
*
|
|
***
|
|
*
|
|
* Fowler/Noll/Vo- hash
|
|
*
|
|
* The basis of this hash algorithm was taken from an idea sent
|
|
* as reviewer comments to the IEEE POSIX P1003.2 committee by:
|
|
*
|
|
* Phong Vo (http://www.research.att.com/info/kpv/)
|
|
* Glenn Fowler (http://www.research.att.com/~gsf/)
|
|
*
|
|
* In a subsequent ballot round:
|
|
*
|
|
* Landon Curt Noll (http://www.isthe.com/chongo/)
|
|
*
|
|
* improved on their algorithm. Some people tried this hash
|
|
* and found that it worked rather well. In an EMail message
|
|
* to Landon, they named it the ``Fowler/Noll/Vo'' or FNV hash.
|
|
*
|
|
* FNV hashes are designed to be fast while maintaining a low
|
|
* collision rate. The FNV speed allows one to quickly hash lots
|
|
* of data while maintaining a reasonable collision rate. See:
|
|
*
|
|
* http://www.isthe.com/chongo/tech/comp/fnv/index.html
|
|
*
|
|
* for more details as well as other forms of the FNV hash.
|
|
*
|
|
***
|
|
*
|
|
* NOTE: The FNV-0 historic hash is not recommended. One should use
|
|
* the FNV-1 hash instead.
|
|
*
|
|
* To use the 32 bit FNV-0 historic hash, pass FNV0_32_INIT as the
|
|
* Fnv32_t hashval argument to fnv_32_buf() or fnv_32_str().
|
|
*
|
|
* To use the 64 bit FNV-0 historic hash, pass FNV0_64_INIT as the
|
|
* Fnv64_t hashval argument to fnv_64_buf() or fnv_64_str().
|
|
*
|
|
* To use the recommended 32 bit FNV-1 hash, pass FNV1_32_INIT as the
|
|
* Fnv32_t hashval argument to fnv_32_buf() or fnv_32_str().
|
|
*
|
|
* To use the recommended 64 bit FNV-1 hash, pass FNV1_64_INIT as the
|
|
* Fnv64_t hashval argument to fnv_64_buf() or fnv_64_str().
|
|
*
|
|
* To use the recommended 32 bit FNV-1a hash, pass FNV1_32A_INIT as the
|
|
* Fnv32_t hashval argument to fnv_32a_buf() or fnv_32a_str().
|
|
*
|
|
* To use the recommended 64 bit FNV-1a hash, pass FNV1A_64_INIT as the
|
|
* Fnv64_t hashval argument to fnv_64a_buf() or fnv_64a_str().
|
|
*
|
|
***
|
|
*
|
|
* Please do not copyright this code. This code is in the public domain.
|
|
*
|
|
* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
|
|
* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
|
|
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
|
|
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
|
|
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
* PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* By:
|
|
* chongo <Landon Curt Noll> /\oo/\
|
|
* http://www.isthe.com/chongo/
|
|
*
|
|
* Share and Enjoy! :-)
|
|
*/
|
|
|
|
#if !defined(__FNV_H__)
|
|
#define __FNV_H__
|
|
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
|
|
#define FNV_VERSION "5.0.2" /* @(#) FNV Version */
|
|
|
|
|
|
/*
|
|
* 32 bit FNV-0 hash type
|
|
*/
|
|
typedef uint32_t Fnv32_t;
|
|
|
|
|
|
/*
|
|
* 32 bit FNV-0 zero initial basis
|
|
*
|
|
* This historic hash is not recommended. One should use
|
|
* the FNV-1 hash and initial basis instead.
|
|
*/
|
|
#define FNV0_32_INIT ((Fnv32_t)0)
|
|
|
|
|
|
/*
|
|
* 32 bit FNV-1 and FNV-1a non-zero initial basis
|
|
*
|
|
* The FNV-1 initial basis is the FNV-0 hash of the following 32 octets:
|
|
*
|
|
* chongo <Landon Curt Noll> /\../\
|
|
*
|
|
* NOTE: The \'s above are not back-slashing escape characters.
|
|
* They are literal ASCII backslash 0x5c characters.
|
|
*
|
|
* NOTE: The FNV-1a initial basis is the same value as FNV-1 by definition.
|
|
*/
|
|
#define FNV1_32_INIT ((Fnv32_t)0x811c9dc5)
|
|
#define FNV1_32A_INIT FNV1_32_INIT
|
|
|
|
|
|
/*
|
|
* determine how 64 bit unsigned values are represented
|
|
*/
|
|
#include "longlong.h"
|
|
|
|
|
|
/*
|
|
* 64 bit FNV-0 hash
|
|
*/
|
|
#if defined(HAVE_64BIT_LONG_LONG)
|
|
typedef uint64_t Fnv64_t;
|
|
#else /* HAVE_64BIT_LONG_LONG */
|
|
typedef struct {
|
|
uint32_t w32[2]; /* w32[0] is low order, w32[1] is high order word */
|
|
} Fnv64_t;
|
|
#endif /* HAVE_64BIT_LONG_LONG */
|
|
|
|
|
|
/*
|
|
* 64 bit FNV-0 zero initial basis
|
|
*
|
|
* This historic hash is not recommended. One should use
|
|
* the FNV-1 hash and initial basis instead.
|
|
*/
|
|
#if defined(HAVE_64BIT_LONG_LONG)
|
|
#define FNV0_64_INIT ((Fnv64_t)0)
|
|
#else /* HAVE_64BIT_LONG_LONG */
|
|
extern const Fnv64_t fnv0_64_init;
|
|
#define FNV0_64_INIT (fnv0_64_init)
|
|
#endif /* HAVE_64BIT_LONG_LONG */
|
|
|
|
|
|
/*
|
|
* 64 bit FNV-1 non-zero initial basis
|
|
*
|
|
* The FNV-1 initial basis is the FNV-0 hash of the following 32 octets:
|
|
*
|
|
* chongo <Landon Curt Noll> /\../\
|
|
*
|
|
* NOTE: The \'s above are not back-slashing escape characters.
|
|
* They are literal ASCII backslash 0x5c characters.
|
|
*
|
|
* NOTE: The FNV-1a initial basis is the same value as FNV-1 by definition.
|
|
*/
|
|
#if defined(HAVE_64BIT_LONG_LONG)
|
|
#define FNV1_64_INIT ((Fnv64_t)0xcbf29ce484222325ULL)
|
|
#define FNV1A_64_INIT FNV1_64_INIT
|
|
#else /* HAVE_64BIT_LONG_LONG */
|
|
extern const fnv1_64_init;
|
|
extern const Fnv64_t fnv1a_64_init;
|
|
#define FNV1_64_INIT (fnv1_64_init)
|
|
#define FNV1A_64_INIT (fnv1a_64_init)
|
|
#endif /* HAVE_64BIT_LONG_LONG */
|
|
|
|
|
|
/*
|
|
* hash types
|
|
*/
|
|
enum fnv_type {
|
|
FNV_NONE = 0, /* invalid FNV hash type */
|
|
FNV0_32 = 1, /* FNV-0 32 bit hash */
|
|
FNV1_32 = 2, /* FNV-1 32 bit hash */
|
|
FNV1a_32 = 3, /* FNV-1a 32 bit hash */
|
|
FNV0_64 = 4, /* FNV-0 64 bit hash */
|
|
FNV1_64 = 5, /* FNV-1 64 bit hash */
|
|
FNV1a_64 = 6, /* FNV-1a 64 bit hash */
|
|
};
|
|
|
|
|
|
/*
|
|
* these test vectors are used as part o the FNV test suite
|
|
*/
|
|
struct test_vector {
|
|
void *buf; /* start of test vector buffer */
|
|
int len; /* length of test vector */
|
|
};
|
|
struct fnv0_32_test_vector {
|
|
struct test_vector *test; /* test vector buffer to hash */
|
|
Fnv32_t fnv0_32; /* expected FNV-0 32 bit hash value */
|
|
};
|
|
struct fnv1_32_test_vector {
|
|
struct test_vector *test; /* test vector buffer to hash */
|
|
Fnv32_t fnv1_32; /* expected FNV-1 32 bit hash value */
|
|
};
|
|
struct fnv1a_32_test_vector {
|
|
struct test_vector *test; /* test vector buffer to hash */
|
|
Fnv32_t fnv1a_32; /* expected FNV-1a 32 bit hash value */
|
|
};
|
|
struct fnv0_64_test_vector {
|
|
struct test_vector *test; /* test vector buffer to hash */
|
|
Fnv64_t fnv0_64; /* expected FNV-0 64 bit hash value */
|
|
};
|
|
struct fnv1_64_test_vector {
|
|
struct test_vector *test; /* test vector buffer to hash */
|
|
Fnv64_t fnv1_64; /* expected FNV-1 64 bit hash value */
|
|
};
|
|
struct fnv1a_64_test_vector {
|
|
struct test_vector *test; /* test vector buffer to hash */
|
|
Fnv64_t fnv1a_64; /* expected FNV-1a 64 bit hash value */
|
|
};
|
|
|
|
|
|
/*
|
|
* external functions
|
|
*/
|
|
/* hash_32.c */
|
|
extern Fnv32_t fnv_32_buf(void *buf, size_t len, Fnv32_t hashval);
|
|
extern Fnv32_t fnv_32_str(char *buf, Fnv32_t hashval);
|
|
|
|
/* hash_32a.c */
|
|
extern Fnv32_t fnv_32a_buf(void *buf, size_t len, Fnv32_t hashval);
|
|
extern Fnv32_t fnv_32a_str(char *buf, Fnv32_t hashval);
|
|
|
|
/* hash_64.c */
|
|
extern Fnv64_t fnv_64_buf(void *buf, size_t len, Fnv64_t hashval);
|
|
extern Fnv64_t fnv_64_str(char *buf, Fnv64_t hashval);
|
|
|
|
/* hash_64a.c */
|
|
extern Fnv64_t fnv_64a_buf(void *buf, size_t len, Fnv64_t hashval);
|
|
extern Fnv64_t fnv_64a_str(char *buf, Fnv64_t hashval);
|
|
|
|
/* test_fnv.c */
|
|
extern struct test_vector fnv_test_str[];
|
|
extern struct fnv0_32_test_vector fnv0_32_vector[];
|
|
extern struct fnv1_32_test_vector fnv1_32_vector[];
|
|
extern struct fnv1a_32_test_vector fnv1a_32_vector[];
|
|
extern struct fnv0_64_test_vector fnv0_64_vector[];
|
|
extern struct fnv1_64_test_vector fnv1_64_vector[];
|
|
extern struct fnv1a_64_test_vector fnv1a_64_vector[];
|
|
extern void unknown_hash_type(char *prog, enum fnv_type type, int code);
|
|
extern void print_fnv32(Fnv32_t hval, Fnv32_t mask, int verbose, char *arg);
|
|
extern void print_fnv64(Fnv64_t hval, Fnv64_t mask, int verbose, char *arg);
|
|
|
|
|
|
#endif /* __FNV_H__ */
|