2016-09-17 15:30:13 +00:00
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.\"-
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2017-04-29 00:31:15 +00:00
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.\" Copyright (c) 2015-2016 The University of Oslo
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2016-09-17 15:30:13 +00:00
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.\" Copyright (c) 2016 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 September 17, 2016
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.Dt CRYB_PEARSON_HASH 3
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.Os
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.Sh NAME
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.Nm cryb_pearson_hash ,
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.Nm cryb_pearson_hash_str
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.Nd 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 uint8_t
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.Fn cryb_pearson_hash "const void *data" "size_t len"
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.Ft uint8_t
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.Fn cryb_pearson_hash_str "const char *str"
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.Sh DESCRIPTION
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The
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.Fn cryb_pearson_hash
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function returns an 8-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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.Pp
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The
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.Fn cryb_pearson_hash_str
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function returns an 8-bit hash of the NUL-terminated string pointed to
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by
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.Va str ,
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not including the terminating NUL.
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It is equivalent to calling
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.Li cryb_pearson_hash(str, strlen(str)) .
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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 "Pearson, Peter K."
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.%D "June 1990"
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.%T "Fast Hashing of Variable-Length Text Strings"
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.%J "Communications of the ACM"
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.%V "33"
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.%N "6"
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.%P "677"
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.%O "doi:10.1145/78973.78978"
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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 for the University of Oslo by
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.An Dag-Erling Sm\(/orgrav Aq Mt d.e.smorgrav@usit.uio.no .
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