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/*
* Copyright (C) 2025 Jakub Kruszona-Zawadzki, Saglabs SA
*
* This file is part of MooseFS.
*
* MooseFS is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 (only).
*
* MooseFS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MooseFS; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301, USA
* or visit http://www.gnu.org/licenses/gpl-2.0.html
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <inttypes.h>
#ifdef _USE_PTHREADS
#include <pthread.h>
#endif
#include "clocks.h"
static uint8_t i,j;
static uint8_t p[256];
#ifdef _USE_PTHREADS
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
#endif
int rnd_init(void) {
uint8_t key[64],vkey[64];
register uint8_t x;
uint16_t l;
srandom(time(NULL)+monotonic_useconds());
for (l=0 ; l<64 ; l++) {
key[l] = random();
vkey[l] = random();
}
#ifdef _USE_PTHREADS
pthread_mutex_lock(&lock);
#endif
for (l=0 ; l<256 ; l++) {
p[l]=l;
}
for (l=0 ; l<768 ; l++) {
i = l&0xFF;
x = j+p[i]+key[l%64];
j = p[x];
x = p[i];
p[i] = p[j];
p[j] = x;
}
for (l=0 ; l<768 ; l++) {
i = l&0xFF;
x = j+p[i]+vkey[l%64];
j = p[x];
x = p[i];
p[i] = p[j];
p[j] = x;
}
i = 0;
#ifdef _USE_PTHREADS
pthread_mutex_unlock(&lock);
#endif
return 0;
}
#define RND_RC4_STEP(result) { \
register uint8_t x; \
x = j+p[i]; \
j = p[x]; \
x = p[j]; \
x = p[x]+1; \
result = p[x]; \
x = p[i]; \
p[i] = p[j]; \
p[j] = x; \
i++; \
}
uint8_t rndu8(void) {
uint8_t r;
#ifdef _USE_PTHREADS
pthread_mutex_lock(&lock);
#endif
RND_RC4_STEP(r);
#ifdef _USE_PTHREADS
pthread_mutex_unlock(&lock);
#endif
return r;
}
uint32_t rndu32(void) {
uint32_t res;
uint8_t *r = (uint8_t*)&res;
#ifdef _USE_PTHREADS
pthread_mutex_lock(&lock);
#endif
RND_RC4_STEP(r[0]);
RND_RC4_STEP(r[1]);
RND_RC4_STEP(r[2]);
RND_RC4_STEP(r[3]);
#ifdef _USE_PTHREADS
pthread_mutex_unlock(&lock);
#endif
return res;
}
uint64_t rndu64(void) {
uint64_t res;
uint8_t *r = (uint8_t*)&res;
#ifdef _USE_PTHREADS
pthread_mutex_lock(&lock);
#endif
RND_RC4_STEP(r[0]);
RND_RC4_STEP(r[1]);
RND_RC4_STEP(r[2]);
RND_RC4_STEP(r[3]);
RND_RC4_STEP(r[4]);
RND_RC4_STEP(r[5]);
RND_RC4_STEP(r[6]);
RND_RC4_STEP(r[7]);
#ifdef _USE_PTHREADS
pthread_mutex_unlock(&lock);
#endif
return res;
}
void rndbuff(uint8_t *buff,uint32_t size) {
uint32_t k;
#ifdef _USE_PTHREADS
pthread_mutex_lock(&lock);
#endif
for (k=0 ; k<size ; k++) {
RND_RC4_STEP(buff[k]);
}
#ifdef _USE_PTHREADS
pthread_mutex_unlock(&lock);
#endif
}
uint64_t rndu64_ranged(uint64_t range) {
uint64_t max,r;
r = rndu64();
if (range==0) {
return r;
}
max = -(((uint64_t)-range) % range);
if (max) {
while (r>=max) {
r = rndu64();
}
}
return r%range;
}
uint32_t rndu32_ranged(uint32_t range) {
uint32_t max,r;
r = rndu32();
if (range==0) {
return r;
}
max = -(((uint32_t)-range) % range);
if (max) {
while (r>=max) {
r = rndu32();
}
}
return r%range;
}
/* test loop:
int main(int argc,char **argv) {
uint32_t x,y,range;
uint64_t i;
double xmean=0.0,ymean=0.0;
double delta;
rnd_init();
if (argc==2) {
range = strtoul(argv[1],NULL,10);
} else {
range = 3000000000;
}
i = 1;
while (i<100000000) {
x = rndu32()%range;
y = rndu32_ranged(range);
delta = x-xmean;
xmean += delta / i;
delta = y-ymean;
ymean += delta / i;
i++;
if ((i%1000000)==0) {
printf("%.6lf : %.6lf\n",((range/2.0)-0.5-xmean)/range,((range/2.0)-0.5-ymean)/range);
}
}
return 0;
}
*/
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