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#include <liboil/liboil.h>
#include <liboil/liboildebug.h>
#include <time.h>
#include <stdio.h>
#include <string.h>
typedef struct _OilRandomState OilRandomState;
struct _OilRandomState {
int index;
uint32_t mt[624];
uint32_t bits[624];
};
OilRandomState state;
static void _oil_random_init (void);
uint32_t oil_random_get_int (OilRandomState *state);
void oil_random_get_bits (OilRandomState *state, uint8_t *dest, int n);
int
main (int argc, char *argv[])
{
int i;
uint32_t a[10];
oil_init();
_oil_random_init();
for(i=0;i<10;i++){
printf("%d\n", oil_random_get_int(&state));
}
oil_random_get_bits (&state, (void *)a, 10*4);
for(i=0;i<10;i++){
printf("%d\n", a[i]);
}
return 0;
}
void
oil_random_state_seed (OilRandomState *state, uint32_t seed)
{
uint32_t *mt = state->mt;
int i;
mt[0] = seed;
for(i=1;i<624;i++) {
mt[i] = (1812433253UL * (mt[i-1] ^ (mt[i-1] >> 30)) + i);
}
oil_mt19937 (state->bits, state->mt);
state->index = 0;
}
static void
_oil_random_init (void)
{
int seed;
seed = time(NULL);
OIL_ERROR("seed is %d", seed);
oil_random_state_seed (&state, seed);
}
uint32_t
oil_random_get_int (OilRandomState *state)
{
if (state->index >= 624) {
oil_mt19937 (state->bits, state->mt);
state->index = 0;
}
return state->bits[state->index++];
}
void
oil_random_get_bits (OilRandomState *state, uint8_t *dest, int n)
{
int i = state->index * 4;
int m;
while(n > 0) {
if (i >= 624*4) {
oil_mt19937 (state->bits, state->mt);
i = 0;
}
m = n;
if (m > 624*4 - i) m = 624*4 - i;
memcpy (dest, ((uint8_t *)state->bits) + i, m);
i += m;
n -= m;
}
state->index = (i+3)/4;
}
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