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24 lines
702 B
C++
24 lines
702 B
C++
#include "websocket.h"
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// https://www.pcg-random.org/using-pcg-c-basic.html
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namespace dmWebsocket
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{
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uint32_t pcg32_random_r(pcg32_random_t* rng)
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{
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uint64_t oldstate = rng->state;
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rng->state = oldstate * 6364136223846793005ULL + rng->inc;
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uint32_t xorshifted = ((oldstate >> 18u) ^ oldstate) >> 27u;
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uint32_t rot = oldstate >> 59u;
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return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
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}
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void pcg32_srandom_r(pcg32_random_t* rng, uint64_t initstate, uint64_t initseq)
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{
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rng->state = 0U;
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rng->inc = (initseq << 1u) | 1u;
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pcg32_random_r(rng);
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rng->state += initstate;
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pcg32_random_r(rng);
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}
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} |