sys/seq: Serial Number Arithmetic
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Cenk Gündoğan
parent
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commit
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396
sys/include/seq.h
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396
sys/include/seq.h
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/*
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* Copyright (C) 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
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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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/**
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* @defgroup sys_seq Serial Number Arithmetic
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* @ingroup sys
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* @brief Serial Number Arithmetic (RFC 1982)
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* @{
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*
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* @file
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* @brief Serial Number Arithmetic (RFC 1982)
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* @see <a href="https://tools.ietf.org/html/rfc1982">
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* RFC 1982 - Serial Number Arithmetic
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* </a>
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*
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* @author Cenk Gündoğan <cnkgndgn@gmail.com>
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*/
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#ifndef SEQ_H
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#define SEQ_H
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#include <stdint.h>
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#include <errno.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Maximum for the addition of a positive integer. X denotes the size of the space
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*/
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#define SEQ_LIMIT(X) (X >> 1)
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/**
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* @brief A 8 bit sequence number
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*/
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typedef uint8_t seq8_t;
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/**
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* @brief A 16 bit sequence number
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*/
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typedef uint16_t seq16_t;
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/**
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* @brief A 32 bit sequence number
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*/
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typedef uint32_t seq32_t;
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/**
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* @brief A 64 bit sequence number
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*/
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typedef uint64_t seq64_t;
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/**
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* @brief Addition of a 8 bit sequence number @p s and a positive integer @p n
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* in the serial number @p space
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.1">
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* 3.1. Addition
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* </a>
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* @param[in] s sequence number
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* @param[in] n positive integer in the range of [0 .. ((@p space / 2) - 1)]
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return s + n, if valid
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* @return s, if n is out of range
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*/
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seq8_t seq8_adds(seq8_t s, uint8_t n, uint8_t space);
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/**
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* @brief Addition of a 8 bit sequence number @p s and a positive integer @p n
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* in the serial number space UINT8_MAX
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.1">
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* 3.1. Addition
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* </a>
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* @param[in] s sequence number
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* @param[in] n positive integer in the range of [0 .. 127]
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* @return s + n, if valid
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* @return s, if n is out of range
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*/
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static inline seq8_t seq8_add(seq8_t s, uint8_t n)
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{
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return seq8_adds(s, n, UINT8_MAX);
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}
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/**
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* @brief Increment a sequence number @p s by 1 in the serial number @p space
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* @param[in] s sequence number
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return s + 1
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*/
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static inline seq8_t seq8_incs(seq8_t s, uint8_t space)
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{
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return seq8_adds(s, 1, space);
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}
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/**
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* @brief Increment a sequence number @p s by 1 in the serial number space UINT8_MAX
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* @param[in] s sequence number
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* @return s + 1
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*/
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static inline seq8_t seq8_inc(seq8_t s)
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{
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return seq8_adds(s, 1, UINT8_MAX);
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}
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/**
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* @brief Compare sequence numbers @p s1, @p s2 in the serial number @p space
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.2">
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* 3.2. Comparison
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* </a>
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* @param[in] s1 first sequence number
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* @param[in] s2 second sequence number
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return -1, if s1 < s2
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* @return 0, if s1 == s2
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* @return 1, if s1 > s2
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* @return -EINVAL, if comparison of the pair (s1,s2) is undefined
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*/
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int seq8_compares(seq8_t s1, seq8_t s2, uint8_t space);
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/**
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* @brief Compare sequence numbers @p s1, @p s2 in the serial number space UINT8_MAX
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.2">
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* 3.2. Comparison
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* </a>
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* @param[in] s1 first sequence number
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* @param[in] s2 second sequence number
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* @return -1, if s1 < s2
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* @return 0, if s1 == s2
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* @return 1, if s1 > s2
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* @return -EINVAL, if comparison of the pair (s1,s2) is undefined
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*/
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static inline int seq8_compare(seq8_t s1, seq8_t s2)
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{
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return seq8_compares(s1, s2, UINT8_MAX);
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}
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/**
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* @brief Addition of a 16 bit sequence number @p s and a positive integer @p n
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* in the serial number @p space
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.1">
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* 3.1. Addition
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* </a>
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* @param[in] s sequence number
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* @param[in] n positive integer in the range of [0 .. ((@p space / 2) - 1)]
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return s + n, if valid
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* @return s, if n is out of range
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*/
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seq16_t seq16_adds(seq16_t s, uint16_t n, uint16_t space);
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/**
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* @brief Addition of a 16 bit sequence number @p s and a positive integer @p n
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* in the serial number space UINT16_MAX
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.1">
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* 3.1. Addition
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* </a>
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* @param[in] s sequence number
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* @param[in] n positive integer in the range of [0 .. 127]
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* @return s + n, if valid
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* @return s, if n is out of range
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*/
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static inline seq16_t seq16_add(seq16_t s, uint16_t n)
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{
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return seq16_adds(s, n, UINT16_MAX);
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}
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/**
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* @brief Increment a sequence number @p s by 1 in the serial number @p space
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* @param[in] s sequence number
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return s + 1
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*/
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static inline seq16_t seq16_incs(seq16_t s, uint16_t space)
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{
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return seq16_adds(s, 1, space);
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}
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/**
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* @brief Increment a sequence number @p s by 1 in the serial number space UINT16_MAX
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* @param[in] s sequence number
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* @return s + 1
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*/
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static inline seq16_t seq16_inc(seq16_t s)
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{
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return seq16_adds(s, 1, UINT16_MAX);
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}
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/**
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* @brief Compare sequence numbers @p s1, @p s2 in the serial number @p space
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.2">
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* 3.2. Comparison
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* </a>
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* @param[in] s1 first sequence number
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* @param[in] s2 second sequence number
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return -1, if s1 < s2
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* @return 0, if s1 == s2
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* @return 1, if s1 > s2
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* @return -EINVAL, if comparison of the pair (s1,s2) is undefined
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*/
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int seq16_compares(seq16_t s1, seq16_t s2, uint16_t space);
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/**
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* @brief Compare sequence numbers @p s1, @p s2 in the serial number space UINT16_MAX
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.2">
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* 3.2. Comparison
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* </a>
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* @param[in] s1 first sequence number
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* @param[in] s2 second sequence number
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* @return -1, if s1 < s2
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* @return 0, if s1 == s2
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* @return 1, if s1 > s2
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* @return -EINVAL, if comparison of the pair (s1,s2) is undefined
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*/
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static inline int seq16_compare(seq16_t s1, seq16_t s2)
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{
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return seq16_compares(s1, s2, UINT16_MAX);
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}
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/**
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* @brief Addition of a 32 bit sequence number @p s and a positive integer @p n
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* in the serial number @p space
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.1">
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* 3.1. Addition
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* </a>
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* @param[in] s sequence number
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* @param[in] n positive integer in the range of [0 .. ((@p space / 2) - 1)]
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return s + n, if valid
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* @return s, if n is out of range
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*/
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seq32_t seq32_adds(seq32_t s, uint32_t n, uint32_t space);
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/**
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* @brief Addition of a 32 bit sequence number @p s and a positive integer @p n
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* in the serial number space UINT32_MAX
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.1">
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* 3.1. Addition
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* </a>
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* @param[in] s sequence number
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* @param[in] n positive integer in the range of [0 .. 127]
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* @return s + n, if valid
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* @return s, if n is out of range
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*/
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static inline seq32_t seq32_add(seq32_t s, uint32_t n)
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{
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return seq32_adds(s, n, UINT32_MAX);
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}
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/**
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* @brief Increment a sequence number @p s by 1 in the serial number @p space
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* @param[in] s sequence number
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return s + 1
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*/
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static inline seq32_t seq32_incs(seq32_t s, uint32_t space)
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{
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return seq32_adds(s, 1, space);
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}
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/**
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* @brief Increment a sequence number @p s by 1 in the serial number space UINT32_MAX
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* @param[in] s sequence number
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* @return s + 1
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*/
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static inline seq32_t seq32_inc(seq32_t s)
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{
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return seq32_adds(s, 1, UINT32_MAX);
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}
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/**
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* @brief Compare sequence numbers @p s1, @p s2 in the serial number @p space
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.2">
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* 3.2. Comparison
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* </a>
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* @param[in] s1 first sequence number
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* @param[in] s2 second sequence number
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return -1, if s1 < s2
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* @return 0, if s1 == s2
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* @return 1, if s1 > s2
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* @return -EINVAL, if comparison of the pair (s1,s2) is undefined
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*/
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int seq32_compares(seq32_t s1, seq32_t s2, uint32_t space);
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/**
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* @brief Compare sequence numbers @p s1, @p s2 in the serial number space UINT32_MAX
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.2">
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* 3.2. Comparison
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* </a>
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* @param[in] s1 first sequence number
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* @param[in] s2 second sequence number
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* @return -1, if s1 < s2
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* @return 0, if s1 == s2
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* @return 1, if s1 > s2
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* @return -EINVAL, if comparison of the pair (s1,s2) is undefined
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*/
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static inline int seq32_compare(seq32_t s1, seq32_t s2)
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{
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return seq32_compares(s1, s2, UINT32_MAX);
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}
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/**
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* @brief Addition of a 64 bit sequence number @p s and a positive integer @p n
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* in the serial number @p space
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.1">
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* 3.1. Addition
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* </a>
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* @param[in] s sequence number
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* @param[in] n positive integer in the range of [0 .. ((@p space / 2) - 1)]
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return s + n, if valid
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* @return s, if n is out of range
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*/
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seq64_t seq64_adds(seq64_t s, uint64_t n, uint64_t space);
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/**
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* @brief Addition of a 64 bit sequence number @p s and a positive integer @p n
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* in the serial number space UINT64_MAX
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.1">
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* 3.1. Addition
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* </a>
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* @param[in] s sequence number
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* @param[in] n positive integer in the range of [0 .. 127]
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* @return s + n, if valid
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* @return s, if n is out of range
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*/
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static inline seq64_t seq64_add(seq64_t s, uint64_t n)
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{
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return seq64_adds(s, n, UINT64_MAX);
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}
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/**
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* @brief Increment a sequence number @p s by 1 in the serial number @p space
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* @param[in] s sequence number
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return s + 1
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*/
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static inline seq64_t seq64_incs(seq64_t s, uint64_t space)
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{
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return seq64_adds(s, 1, space);
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}
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/**
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* @brief Increment a sequence number @p s by 1 in the serial number space UINT64_MAX
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* @param[in] s sequence number
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* @return s + 1
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*/
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static inline seq64_t seq64_inc(seq64_t s)
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{
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return seq64_adds(s, 1, UINT64_MAX);
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}
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/**
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* @brief Compare sequence numbers @p s1, @p s2 in the serial number @p space
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.2">
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* 3.2. Comparison
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* </a>
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* @param[in] s1 first sequence number
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* @param[in] s2 second sequence number
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* @param[in] space serial number space must be a power of 2 minus 1
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* @return -1, if s1 < s2
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* @return 0, if s1 == s2
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* @return 1, if s1 > s2
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* @return -EINVAL, if comparison of the pair (s1,s2) is undefined
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*/
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int seq64_compares(seq64_t s1, seq64_t s2, uint64_t space);
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/**
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* @brief Compare sequence numbers @p s1, @p s2 in the serial number space UINT64_MAX
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* @see <a href="https://tools.ietf.org/html/rfc1982#section-3.2">
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* 3.2. Comparison
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* </a>
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* @param[in] s1 first sequence number
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* @param[in] s2 second sequence number
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* @return -1, if s1 < s2
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* @return 0, if s1 == s2
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* @return 1, if s1 > s2
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* @return -EINVAL, if comparison of the pair (s1,s2) is undefined
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*/
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static inline int seq64_compare(seq64_t s1, seq64_t s2)
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{
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return seq64_compares(s1, s2, UINT64_MAX);
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}
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#ifdef __cplusplus
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}
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#endif
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/** @} */
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#endif /* SEQ_H */
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1
sys/seq/Makefile
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1
sys/seq/Makefile
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include $(RIOTBASE)/Makefile.base
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158
sys/seq/seq.c
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158
sys/seq/seq.c
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/*
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* Copyright (C) 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
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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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/**
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* @ingroup sys_seq
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* @{
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*
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* @file
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* @brief Serial Number Arithmetic (RFC 1982)
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*
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* @author Cenk Gündoğan <cnkgndgn@gmail.com>
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*
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* @}
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*/
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#include <assert.h>
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#include "seq.h"
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seq8_t seq8_adds(seq8_t s, uint8_t n, uint8_t space)
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{
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/* check if space is a power of 2 minus 1 */
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assert((space != 0) && ((space & (space + 1)) == 0));
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if (n > SEQ_LIMIT(space)) {
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return s;
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}
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return (space == UINT8_MAX) ? (s + n) : (s + n) % (space + 1);
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}
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int seq8_compares(seq8_t s1, seq8_t s2, uint8_t space)
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{
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/* check if space is a power of 2 minus 1 */
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assert((space != 0) && ((space & (space + 1)) == 0));
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if (s1 == s2) {
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return 0;
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}
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|
||||
if (((s1 < s2) && ((uint8_t)(s2 - s1) < (SEQ_LIMIT(space) + 1))) ||
|
||||
((s1 > s2) && ((uint8_t)(s1 - s2) > (SEQ_LIMIT(space) + 1)))) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (((s1 < s2) && ((uint8_t)(s2 - s1) > (SEQ_LIMIT(space) + 1))) ||
|
||||
((s1 > s2) && ((uint8_t)(s1 - s2) < (SEQ_LIMIT(space) + 1)))) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
seq16_t seq16_adds(seq16_t s, uint16_t n, uint16_t space)
|
||||
{
|
||||
/* check if space is a power of 2 minus 1 */
|
||||
assert((space != 0) && ((space & (space + 1)) == 0));
|
||||
|
||||
if (n > SEQ_LIMIT(space)) {
|
||||
return s;
|
||||
}
|
||||
|
||||
return (space == UINT16_MAX) ? (s + n) : (s + n) % (space + 1);
|
||||
}
|
||||
|
||||
int seq16_compares(seq16_t s1, seq16_t s2, uint16_t space)
|
||||
{
|
||||
/* check if space is a power of 2 minus 1 */
|
||||
assert((space != 0) && ((space & (space + 1)) == 0));
|
||||
|
||||
if (s1 == s2) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (((s1 < s2) && ((uint16_t)(s2 - s1) < (SEQ_LIMIT(space) + 1))) ||
|
||||
((s1 > s2) && ((uint16_t)(s1 - s2) > (SEQ_LIMIT(space) + 1)))) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (((s1 < s2) && ((uint16_t)(s2 - s1) > (SEQ_LIMIT(space) + 1))) ||
|
||||
((s1 > s2) && ((uint16_t)(s1 - s2) < (SEQ_LIMIT(space) + 1)))) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
seq32_t seq32_adds(seq32_t s, uint32_t n, uint32_t space)
|
||||
{
|
||||
/* check if space is a power of 2 minus 1 */
|
||||
assert((space != 0) && ((space & (space + 1)) == 0));
|
||||
|
||||
if (n > SEQ_LIMIT(space)) {
|
||||
return s;
|
||||
}
|
||||
|
||||
return (space == UINT32_MAX) ? (s + n) : (s + n) % (space + 1);
|
||||
}
|
||||
|
||||
int seq32_compares(seq32_t s1, seq32_t s2, uint32_t space)
|
||||
{
|
||||
/* check if space is a power of 2 minus 1 */
|
||||
assert((space != 0) && ((space & (space + 1)) == 0));
|
||||
|
||||
if (s1 == s2) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (((s1 < s2) && ((uint32_t)(s2 - s1) < (SEQ_LIMIT(space) + 1))) ||
|
||||
((s1 > s2) && ((uint32_t)(s1 - s2) > (SEQ_LIMIT(space) + 1)))) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (((s1 < s2) && ((uint32_t)(s2 - s1) > (SEQ_LIMIT(space) + 1))) ||
|
||||
((s1 > s2) && ((uint32_t)(s1 - s2) < (SEQ_LIMIT(space) + 1)))) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
seq64_t seq64_adds(seq64_t s, uint64_t n, uint64_t space)
|
||||
{
|
||||
/* check if space is a power of 2 minus 1 */
|
||||
assert((space != 0) && ((space & (space + 1)) == 0));
|
||||
|
||||
if (n > SEQ_LIMIT(space)) {
|
||||
return s;
|
||||
}
|
||||
|
||||
return (space == UINT64_MAX) ? (s + n) : (s + n) % (space + 1);
|
||||
}
|
||||
|
||||
int seq64_compares(seq64_t s1, seq64_t s2, uint64_t space)
|
||||
{
|
||||
/* check if space is a power of 2 minus 1 */
|
||||
assert((space != 0) && ((space & (space + 1)) == 0));
|
||||
|
||||
if (s1 == s2) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (((s1 < s2) && ((uint64_t)(s2 - s1) < (SEQ_LIMIT(space) + 1))) ||
|
||||
((s1 > s2) && ((uint64_t)(s1 - s2) > (SEQ_LIMIT(space) + 1)))) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (((s1 < s2) && ((uint64_t)(s2 - s1) > (SEQ_LIMIT(space) + 1))) ||
|
||||
((s1 > s2) && ((uint64_t)(s1 - s2) < (SEQ_LIMIT(space) + 1)))) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user