73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
#pragma once
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#include <cstdlib>
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#include <stdint.h>
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/**
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* @brief Generate random unassigned 16, 32 and 64 bit integer using
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* XorShift algorithm and rand() for generating a seed.
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*/
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class RandomNumberGenerator {
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public:
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uint16_t _seed_x16;
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uint32_t _seed_x32;
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uint64_t _seed_x64;
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/**
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* @brief Construct a new Random Number Generator object
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*/
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inline RandomNumberGenerator()
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: _seed_x16(rand()), _seed_x32(rand()), _seed_x64(rand()) {}
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/**
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* @brief generates a 16 bit unsigned integer between lower limit and
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* upper limit (1024 and 49151 for valid port numbers)
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*
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* @return uint16_t
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*/
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inline uint16_t gen_rdm_16_bit_in_interval(uint16_t _lower_limit,
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uint16_t _upper_limit) {
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_seed_x16 ^= _seed_x16 << 7;
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_seed_x16 ^= _seed_x16 >> 9;
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_seed_x16 ^= _seed_x16 << 8;
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// this method returns a valid port number
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// range should be: 1024 to 49152
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return _seed_x16 % (_upper_limit - _lower_limit) + _lower_limit;
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}
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/**
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* @brief generates 16 bit unsigned integer
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*
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* @return uint16_t
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*/
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inline uint16_t gen_rdm_16_bit() {
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_seed_x16 ^= _seed_x16 << 7;
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_seed_x16 ^= _seed_x16 >> 9;
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_seed_x16 ^= _seed_x16 << 8;
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return _seed_x16;
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}
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/**
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* @brief generates 32 bit unsigned integer
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*
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* @return uint32_t
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*/
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inline uint32_t gen_rdm_32_bit() {
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_seed_x32 ^= _seed_x32 << 14;
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_seed_x32 ^= _seed_x32 >> 13;
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_seed_x32 ^= _seed_x32 << 15;
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return _seed_x32;
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}
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/**
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* @brief generates 64 bit unsigned integer
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*
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* @return uint64_t
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*/
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inline uint64_t gen_rdm_64_bit() {
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_seed_x64 ^= _seed_x64 << 14;
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_seed_x64 ^= _seed_x64 >> 23;
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_seed_x64 ^= _seed_x64 << 33;
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return _seed_x64;
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}
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}; |