*/
+#include <string.h>
+#include <assert.h>
#include "rand.h"
#include "../hash.h"
-struct frand_state __fio_rand_state;
-
static inline int __seed(unsigned int x, unsigned int m)
{
return (x < m) ? x + m : x;
}
+static void __init_rand(struct frand_state *state, unsigned int seed)
+{
+ int cranks = 6;
+
+#define LCG(x, seed) ((x) * 69069 ^ (seed))
+
+ state->s1 = __seed(LCG((2^31) + (2^17) + (2^7), seed), 1);
+ state->s2 = __seed(LCG(state->s1, seed), 7);
+ state->s3 = __seed(LCG(state->s2, seed), 15);
+
+ while (cranks--)
+ __rand(state);
+}
+
void init_rand(struct frand_state *state)
{
-#define LCG(x) ((x) * 69069) /* super-duper LCG */
-
- state->s1 = __seed(LCG((2^31) + (2^17) + (2^7)), 1);
- state->s2 = __seed(LCG(state->s1), 7);
- state->s3 = __seed(LCG(state->s2), 15);
-
- __rand(state);
- __rand(state);
- __rand(state);
- __rand(state);
- __rand(state);
- __rand(state);
+ __init_rand(state, 1);
+}
+
+void init_rand_seed(struct frand_state *state, unsigned int seed)
+{
+ __init_rand(state, seed);
+}
+
+void __fill_random_buf(void *buf, unsigned int len, unsigned long seed)
+{
+ void *ptr = buf;
+
+ 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;
+ }
+}
+
+unsigned long fill_random_buf(struct frand_state *fs, void *buf,
+ unsigned int len)
+{
+ unsigned long r = __rand(fs);
+
+ if (sizeof(int) != sizeof(long *))
+ r *= (unsigned long) __rand(fs);
+
+ __fill_random_buf(buf, len, r);
+ return r;
}
-void fill_random_buf(void *buf, unsigned int len)
+void fill_pattern(void *p, unsigned int len, char *pattern,
+ unsigned int pattern_bytes)
{
- unsigned long r = __rand(&__fio_rand_state);
- long *ptr = buf;
+ switch (pattern_bytes) {
+ case 0:
+ assert(0);
+ break;
+ case 1:
+ memset(p, pattern[0], len);
+ break;
+ default: {
+ unsigned int i = 0, size = 0;
+ unsigned char *b = p;
+
+ while (i < len) {
+ size = pattern_bytes;
+ if (size > (len - i))
+ size = len - i;
+ memcpy(b+i, pattern, size);
+ i += size;
+ }
+ break;
+ }
+ }
+}
+
+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;
+
+ if (percentage == 100) {
+ if (pbytes)
+ fill_pattern(buf, len, pattern, pbytes);
+ else
+ memset(buf, 0, len);
+ return;
+ }
+
+ if (segment > len)
+ segment = len;
+
+ while (len) {
+ /*
+ * Fill random chunk
+ */
+ this_len = (segment * (100 - percentage)) / 100;
+ if (this_len > len)
+ this_len = len;
- if (sizeof(int) != sizeof(*ptr))
- r *= (unsigned long) __rand(&__fio_rand_state);
+ __fill_random_buf(buf, this_len, seed);
- while ((void *) ptr - buf < len) {
- *ptr = r;
- ptr++;
- r *= GOLDEN_RATIO_PRIME;
- r >>= 3;
+ len -= this_len;
+ if (!len)
+ break;
+ buf += this_len;
+
+ if (this_len > len)
+ this_len = len;
+ else if (len - this_len <= sizeof(long))
+ this_len = len;
+
+ if (pbytes)
+ fill_pattern(buf, this_len, pattern, pbytes);
+ else
+ memset(buf, 0, this_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;
+}