mirror of
https://github.com/freebsd/freebsd-src
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8f76bb7dad
Release notes at
https://www.nlnetlabs.nl/news/2023/Aug/30/unbound-1.18.0-released/
MFC after: 2 weeks
Merge commit '401770e05c71ecb5ae61a59d316069b4b78bf622' into main
64 lines
2.4 KiB
C
64 lines
2.4 KiB
C
/*
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* util/rfc_1982.h - RFC 1982 Serial Number Arithmetic
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*
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* Copyright (c) 2023, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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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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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains functions for RFC 1982 serial number arithmetic.
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*/
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#ifndef RFC_1982_H
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#define RFC_1982_H
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/**
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* RFC 1982 comparison, uses unsigned integers, and tries to avoid
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* compiler optimization (eg. by avoiding a-b<0 comparisons).
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* @param a: value to compare.
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* @param b: value to compare.
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* @return 0 if equal, 1 if a > b, else -1.
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*/
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int compare_1982(uint32_t a, uint32_t b);
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/**
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* RFC 1982 subtraction, uses unsigned integers, and tries to avoid
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* compiler optimization (eg. by avoiding a-b<0 comparisons).
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* @param a: value to subtract from.
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* @param b: value to subtract.
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* @return the difference between them if we know that b is larger than a,
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* that is the distance between them in serial number arithmetic.
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*/
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uint32_t subtract_1982(uint32_t a, uint32_t b);
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#endif /* RFC_1982_H */
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