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102 lines
2.0 KiB
C
102 lines
2.0 KiB
C
/**
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* serial number arithmetics (corresponding RFC1982) for version field in ABRO
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*
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* Copyright (C) 2013 INRIA.
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*
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* @ingroup sixlowpan
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* @{
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* @file serialnumber.c
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* @brief serial number arithmetics (corresponding RFC1982) for version field in ABRO
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* @author Martine Lenders <mlenders@inf.fu-berlin.de>
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* @author Oliver Hahm <oliver.hahm@inria.fr>
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* @}
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*/
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#include "serialnumber.h"
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int serial_add8(uint8_t s, uint8_t n)
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{
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if (n > 127) {
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return -1;
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}
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uint16_t sum = s + n;
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return (uint8_t)(sum % 256);
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}
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int serial_add16(uint16_t s, uint16_t n)
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{
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if (n > 32767) {
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return -1;
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}
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uint32_t sum = s + n;
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return (uint16_t)(sum % 65536);
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}
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int serial_add32(uint32_t s, uint32_t n)
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{
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if (n > 2147483647) {
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return -1;
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}
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uint64_t sum = s + n;
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return (uint32_t)(sum % 4294967296);
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}
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serial_comp_res_t serial_comp8(uint8_t s1, uint8_t s2)
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{
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if (s1 == s2) {
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return EQUAL;
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}
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if ((s1 < s2 && s1 - s2 < 128) || (s1 > s2 && s1 - s2 > 128)) {
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return LESS;
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}
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if ((s1 < s2 && s1 - s2 > 128) || (s1 > s2 && s1 - s2 < 128)) {
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return GREATER;
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}
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return UNDEF;
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}
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serial_comp_res_t serial_comp16(uint16_t s1, uint16_t s2)
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{
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if (s1 == s2) {
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return EQUAL;
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}
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if ((s1 < s2 && s1 - s2 < 32768) || (s1 > s2 && s1 - s2 > 32768)) {
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return LESS;
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}
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if ((s1 < s2 && s1 - s2 > 32768) || (s1 > s2 && s1 - s2 < 32768)) {
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return GREATER;
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}
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return UNDEF;
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}
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serial_comp_res_t serial_comp32(uint32_t s1, uint32_t s2)
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{
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if (s1 == s2) {
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return EQUAL;
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}
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if ((s1 < s2 && s1 - s2 < 2147483648) || (s1 > s2 && s1 - s2 > 2147483648)) {
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return LESS;
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}
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if ((s1 < s2 && s1 - s2 > 2147483648) || (s1 > s2 && s1 - s2 < 2147483648)) {
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return GREATER;
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}
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return UNDEF;
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}
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