#include <string.h>
#include <assert.h>
#include "rand.h"
+#include "lib/pattern.h"
#include "../hash.h"
-static inline int __seed(unsigned int x, unsigned int m)
+int arch_random;
+
+static inline uint64_t __seed(uint64_t x, uint64_t m)
{
return (x < m) ? x + m : x;
}
-static void __init_rand(struct frand_state *state, unsigned int seed)
+static void __init_rand32(struct taus88_state *state, unsigned int seed)
{
int cranks = 6;
state->s3 = __seed(LCG(state->s2, seed), 15);
while (cranks--)
- __rand(state);
+ __rand32(state);
}
-void init_rand(struct frand_state *state)
+static void __init_rand64(struct taus258_state *state, uint64_t seed)
{
- __init_rand(state, 1);
+ int cranks = 6;
+
+#define LCG64(x, seed) ((x) * 6906969069ULL ^ (seed))
+
+ state->s1 = __seed(LCG64((2^31) + (2^17) + (2^7), seed), 1);
+ state->s2 = __seed(LCG64(state->s1, seed), 7);
+ state->s3 = __seed(LCG64(state->s2, seed), 15);
+ state->s4 = __seed(LCG64(state->s3, seed), 33);
+ state->s5 = __seed(LCG64(state->s4, seed), 49);
+
+ while (cranks--)
+ __rand64(state);
}
-void init_rand_seed(struct frand_state *state, unsigned int seed)
+void init_rand(struct frand_state *state, bool use64)
{
- __init_rand(state, seed);
+ state->use64 = use64;
+
+ if (!use64)
+ __init_rand32(&state->state32, 1);
+ else
+ __init_rand64(&state->state64, 1);
+}
+
+void init_rand_seed(struct frand_state *state, unsigned int seed, bool use64)
+{
+ state->use64 = use64;
+
+ if (!use64)
+ __init_rand32(&state->state32, seed);
+ else
+ __init_rand64(&state->state64, seed);
}
void __fill_random_buf(void *buf, unsigned int len, unsigned long seed)
{
- long *ptr = buf;
+ void *ptr = buf;
- while ((void *) ptr - buf < len) {
- *ptr = seed;
- ptr++;
+ while (len) {
+ int this_len;
+
+ if (len >= sizeof(int64_t)) {
+ *((int64_t *) ptr) = seed;
+ this_len = sizeof(int64_t);
+ } else if (len >= sizeof(int32_t)) {
+ *((int32_t *) ptr) = seed;
+ this_len = sizeof(int32_t);
+ } else if (len >= sizeof(int16_t)) {
+ *((int16_t *) ptr) = seed;
+ this_len = sizeof(int16_t);
+ } else {
+ *((int8_t *) ptr) = seed;
+ this_len = sizeof(int8_t);
+ }
+ ptr += this_len;
+ len -= this_len;
seed *= GOLDEN_RATIO_PRIME;
seed >>= 3;
}
return r;
}
-unsigned long fill_random_buf_percentage(struct frand_state *fs, void *buf,
- unsigned int percentage,
- unsigned int segment, unsigned int len)
+void __fill_random_buf_percentage(unsigned long seed, void *buf,
+ unsigned int percentage,
+ unsigned int segment, unsigned int len,
+ char *pattern, unsigned int pbytes)
{
- unsigned int this_len, rep_len;
- unsigned long r = __rand(fs);
+ unsigned int this_len;
+
+ if (percentage == 100) {
+ if (pbytes)
+ (void)cpy_pattern(pattern, pbytes, buf, len);
+ else
+ memset(buf, 0, len);
+ return;
+ }
- assert(segment <= len);
-
- if (sizeof(int) != sizeof(long *))
- r *= (unsigned long) __rand(fs);
+ if (segment > len)
+ segment = len;
while (len) {
/*
if (this_len > len)
this_len = len;
- __fill_random_buf(buf, this_len, r);
+ __fill_random_buf(buf, this_len, seed);
len -= this_len;
+ if (!len)
+ break;
buf += this_len;
- /*
- * Now duplicate random chunk in rest of buf
- */
- rep_len = segment - this_len;
- if (rep_len > len)
- rep_len = len;
+ if (this_len > len)
+ this_len = len;
+ else if (len - this_len <= sizeof(long))
+ this_len = len;
+
+ if (pbytes)
+ (void)cpy_pattern(pattern, pbytes, buf, this_len);
+ else
+ memset(buf, 0, this_len);
- memcpy(buf, buf + rep_len, rep_len);
- buf += rep_len;
- len -= rep_len;
+ len -= this_len;
+ buf += this_len;
}
+}
+
+unsigned long fill_random_buf_percentage(struct frand_state *fs, void *buf,
+ unsigned int percentage,
+ unsigned int segment, unsigned int len,
+ char *pattern, unsigned int pbytes)
+{
+ unsigned long r = __rand(fs);
+
+ if (sizeof(int) != sizeof(long *))
+ r *= (unsigned long) __rand(fs);
+ __fill_random_buf_percentage(r, buf, percentage, segment, len,
+ pattern, pbytes);
return r;
}