37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
#ifndef FIO_RAND_H
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#define FIO_RAND_H
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#define FRAND_MAX (-1U)
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struct frand_state {
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unsigned int s1, s2, s3;
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};
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static inline void frand_copy(struct frand_state *dst,
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struct frand_state *src)
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{
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dst->s1 = src->s1;
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dst->s2 = src->s2;
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dst->s3 = src->s3;
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}
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static inline unsigned int __rand(struct frand_state *state)
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{
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#define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b)
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state->s1 = TAUSWORTHE(state->s1, 13, 19, 4294967294UL, 12);
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state->s2 = TAUSWORTHE(state->s2, 2, 25, 4294967288UL, 4);
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state->s3 = TAUSWORTHE(state->s3, 3, 11, 4294967280UL, 17);
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return (state->s1 ^ state->s2 ^ state->s3);
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}
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extern void init_rand(struct frand_state *);
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extern void init_rand_seed(struct frand_state *, unsigned int seed);
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extern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed);
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extern unsigned long fill_random_buf(struct frand_state *, void *buf, unsigned int len);
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extern void __fill_random_buf_percentage(unsigned long, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int);
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extern unsigned long fill_random_buf_percentage(struct frand_state *, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int);
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extern void fill_pattern(void *p, unsigned int len, char *pattern, unsigned int pattern_bytes);
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#endif
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