mirror of
https://github.com/freebsd/freebsd-src
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103ba509e7
Release notes at
https://www.nlnetlabs.nl/news/2023/Aug/30/unbound-1.19.0-released/
MFC after: 2 weeks
Merge commit '16fd0b24910488e59ca1941387b9ac7fb646a837' into unbound
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/*
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* util/rfc_1982.c - 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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#include "config.h"
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#include "util/rfc_1982.h"
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int
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compare_1982(uint32_t a, uint32_t b)
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{
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/* for 32 bit values */
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const uint32_t cutoff = ((uint32_t) 1 << (32 - 1));
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if (a == b) {
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return 0;
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} else if ((a < b && b - a < cutoff) || (a > b && a - b > cutoff)) {
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return -1;
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} else {
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return 1;
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}
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}
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uint32_t
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subtract_1982(uint32_t a, uint32_t b)
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{
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/* for 32 bit values */
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const uint32_t cutoff = ((uint32_t) 1 << (32 - 1));
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if(a == b)
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return 0;
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if(a < b && b - a < cutoff) {
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return b-a;
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}
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if(a > b && a - b > cutoff) {
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return ((uint32_t)0xffffffff) - (a-b-1);
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}
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/* wrong case, b smaller than a */
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return 0;
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}
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