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1fbbf72e JA |
1 | #ifndef FIO_RAND_H |
2 | #define FIO_RAND_H | |
3 | ||
2615cc4b JA |
4 | #define FRAND_MAX (-1U) |
5 | ||
1fbbf72e JA |
6 | struct frand_state { |
7 | unsigned int s1, s2, s3; | |
8 | }; | |
9 | ||
5c94b008 JA |
10 | static inline void frand_copy(struct frand_state *dst, |
11 | struct frand_state *src) | |
12 | { | |
13 | dst->s1 = src->s1; | |
14 | dst->s2 = src->s2; | |
15 | dst->s3 = src->s3; | |
16 | } | |
17 | ||
1fbbf72e JA |
18 | static inline unsigned int __rand(struct frand_state *state) |
19 | { | |
20 | #define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b) | |
21 | ||
22 | state->s1 = TAUSWORTHE(state->s1, 13, 19, 4294967294UL, 12); | |
23 | state->s2 = TAUSWORTHE(state->s2, 2, 25, 4294967288UL, 4); | |
24 | state->s3 = TAUSWORTHE(state->s3, 3, 11, 4294967280UL, 17); | |
25 | ||
26 | return (state->s1 ^ state->s2 ^ state->s3); | |
27 | } | |
28 | ||
29 | extern void init_rand(struct frand_state *); | |
2615cc4b | 30 | extern void init_rand_seed(struct frand_state *, unsigned int seed); |
7d9fb455 | 31 | extern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed); |
3545a109 | 32 | extern unsigned long fill_random_buf(struct frand_state *, void *buf, unsigned int len); |
bc769898 | 33 | extern void __fill_random_buf_percentage(unsigned long, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int); |
d1af2894 JA |
34 | extern unsigned long fill_random_buf_percentage(struct frand_state *, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int); |
35 | extern void fill_pattern(void *p, unsigned int len, char *pattern, unsigned int pattern_bytes); | |
1fbbf72e JA |
36 | |
37 | #endif |