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