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/* Random kit 1.3 */
/*
* Copyright (c) 2003-2005, Jean-Sebastien Roy (js@jeannot.org)
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Typical use:
*
* {
* rk_state state;
* unsigned long seed = 1, random_value;
*
* rk_seed(seed, &state); // Initialize the RNG
* ...
* random_value = rk_random(&state); // Generate random values in [0..RK_MAX]
* }
*
* Instead of rk_seed, you can use rk_randomseed which will get a random seed
* from /dev/urandom (or the clock, if /dev/urandom is unavailable):
*
* {
* rk_state state;
* unsigned long random_value;
*
* rk_randomseed(&state); // Initialize the RNG with a random seed
* ...
* random_value = rk_random(&state); // Generate random values in [0..RK_MAX]
* }
*/
/*
* Useful macro:
* RK_DEV_RANDOM: the device used for random seeding.
* defaults to "/dev/urandom"
*/
#pragma once
#include <stddef.h>
#include <util/api.h>
#define RK_STATE_LEN 624
typedef struct rk_state_
{
unsigned long key[RK_STATE_LEN];
int pos;
}
rk_state;
/* Maximum generated random value */
#define RK_MAX 0xFFFFFFFFUL
#ifdef __cplusplus
extern "C" {
#endif
/*
* Initialize the RNG state using the given seed.
*/
PRIVATE void rk_seed(unsigned long seed, rk_state *state);
/*
* Returns a random unsigned long between 0 and RK_MAX inclusive
*/
PRIVATE unsigned long rk_random(rk_state *state);
/*
* Returns a random unsigned long between 0 and max inclusive.
*/
PRIVATE unsigned long rk_interval(unsigned long max, rk_state *state);
#ifdef __cplusplus
}
#endif
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