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108 lines
3.3 KiB
Groff
108 lines
3.3 KiB
Groff
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.\"-
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.\" Copyright (c) 2022 Dag-Erling Smørgrav
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd May 15, 2022
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.Dt CRYB_FNV 3
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.Os
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.Sh NAME
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.Nm cryb_fnv0_32_hash ,
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.Nm cryb_fnv0_64_hash ,
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.Nm cryb_fnv1_32_hash ,
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.Nm cryb_fnv1_64_hash ,
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.Nm cryb_fnv1a_32_hash ,
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.Nm cryb_fnv1a_64_hash
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.Nd non-cryptographic hash functions
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.Sh LIBRARY
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.Lb libcryb-hash
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.Sh SYNOPSIS
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.In stddef.h
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.In stdint.h
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.In cryb/hash.h
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.Ft uint32_t
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.Fn cryb_fnv0_32_hash "const void *data" "size_t len"
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.Ft uint64_t
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.Fn cryb_fnv0_64_hash "const void *data" "size_t len"
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.Ft uint32_t
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.Fn cryb_fnv1_32_hash "const void *data" "size_t len"
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.Ft uint64_t
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.Fn cryb_fnv1_64_hash "const void *data" "size_t len"
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.Ft uint32_t
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.Fn cryb_fnv1a_32_hash "const void *data" "size_t len"
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.Ft uint64_t
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.Fn cryb_fnv1a_64_hash "const void *data" "size_t len"
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.Sh DESCRIPTION
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The
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.Fn cryb_fnv0_32_hash ,
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.Fn cryb_fnv1_32_hash ,
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and
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.Fn cryb_fnv1a_32_hash ,
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functions return a 32-bit hash of the
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.Va len
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first bytes of the object pointed to by
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.Va data
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using the Fowler-Noll-Vo (FNV) 0, 1, and 1a algorithms respectively.
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.Pp
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The
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.Fn cryb_fnv0_64_hash ,
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.Fn cryb_fnv1_64_hash ,
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and
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.Fn cryb_fnv1a_64_hash ,
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functions return a 64-bit hash of the
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.Va len
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first bytes of the object pointed to by
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.Va data
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using the FNV 0, 1, and 1a algorithms respectively.
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.Sh IMPLEMENTATION NOTES
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The
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.In cryb/hash.h
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header provides macros which allows these functions to be referred to
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without their
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.Dq Li cryb_
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prefix.
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.Sh SEE ALSO
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.Xr cryb_hash 3
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.Sh STANDARDS
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.Rs
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.%A Fowler, Glenn
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.%A Noll, Landon Curt
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.%A Vo, Kiem-Phong
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.%A Eastlake, Donald
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.%A Hansen, Tony
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.%T The FNV Non-Cryptographic Hash Algorithm
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.%D May 29, 2019
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.%O draft-eastlake-fnv-17
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.%U https://datatracker.ietf.org/doc/html/draft-eastlake-fnv-17
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.Re
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.Sh AUTHORS
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The
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.Fn cryb_pearson_hash
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and
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.Fn cryb_pearson_hash_str
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functions and this manual page were written by
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.An Dag-Erling Sm\(/orgrav Aq Mt des@des.no .
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