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core: add random number generator

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This commit is contained in:
max 🍓
2024-10-24 21:33:05 +01:00
parent d0dcee9c6f
commit 44fb8593a5
8 changed files with 505 additions and 3 deletions
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32
core/include/blue/core/init.h Normal file
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@@ -0,0 +1,32 @@
#ifndef BLUELIB_INIT_H_
#define BLUELIB_INIT_H_
#ifdef __cplusplus
#define B_INIT(f) \
static void f(void); \
struct f##_t_ { \
f##_t_(void) \
{ \
f(); \
} \
}; \
static f##_t_ f##_; \
static void f(void)
#elif defined(_MSB_VER)
#pragma section(".CRT$XCU", read)
#define B_INIT2_(f, p) \
static void f(void); \
__declspec(allocate(".CRT$XCU")) void (*f##_)(void) = f; \
__pragma(comment(linker, "/include:" p #f "_")) static void f(void)
#ifdef _WIN64
#define B_INIT(f) B_INIT2_(f, "")
#else
#define B_INIT(f) B_INIT2_(f, "_")
#endif
#else
#define B_INIT(f) \
static void f(void) __attribute__((constructor)); \
static void f(void)
#endif
#endif

6
core/include/blue/core/misc.h
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@@ -1,5 +1,5 @@
#ifndef BLUELIB_MISC_H_
#define BLUELIB_MISC_H_
#ifndef BLUELIB_MISB_H_
#define BLUELIB_MISB_H_
#define b_unbox(type, box, member) \
((type *_Nonnull)((box) ? (uintptr_t)(box) - (offsetof(type, member)) : 0))
@@ -10,4 +10,4 @@
#define z__b_numargs(arg_type, ...) \
(sizeof((arg_type[]) {__VA_ARGS__}) / sizeof(arg_type))
#endif // C_MISC_H_
#endif // B_MISB_H_

37
core/include/blue/core/random.h Normal file
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#ifndef BLUELIB_RANDOM_H_
#define BLUELIB_RANDOM_H_
#include <blue/core/status.h>
#include <stddef.h>
struct b_random_algorithm;
typedef enum b_random_flags {
/* algorithm selection */
B_RANDOM_MT19937 = 0x01u,
/* generation flags */
B_RANDOM_SECURE = 0x100u,
} b_random_flags;
typedef struct b_random_ctx {
b_random_flags __f;
struct b_random_algorithm *__a;
union {
struct {
unsigned long long mt[312];
size_t mti;
} __mt19937;
};
} b_random_ctx;
extern b_random_ctx *b_random_global_ctx(void);
extern b_status b_random_init(b_random_ctx *ctx, b_random_flags flags);
extern unsigned long long b_random_next_int64(b_random_ctx *ctx);
extern double b_random_next_double(b_random_ctx *ctx);
extern void b_random_next_bytes(
b_random_ctx *ctx, unsigned char *out, size_t nbytes);
#endif

243
core/mt19937.c Normal file
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/*
A C-program for MT19937-64 (2004/9/29 version).
Coded by Takuji Nishimura and Makoto Matsumoto.
This is a 64-bit version of Mersenne Twister pseudorandom number
generator.
Before using, initialize the state by using init_genrand64(seed)
or init_by_array64(init_key, key_length).
Copyright (C) 2004, Makoto Matsumoto and Takuji Nishimura,
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The names of its contributors may not be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
References:
T. Nishimura, ``Tables of 64-bit Mersenne Twisters''
ACM Transactions on Modeling and
Computer Simulation 10. (2000) 348--357.
M. Matsumoto and T. Nishimura,
``Mersenne Twister: a 623-dimensionally equidistributed
uniform pseudorandom number generator''
ACM Transactions on Modeling and
Computer Simulation 8. (Jan. 1998) 3--30.
Any feedback is very welcome.
http://www.math.hiroshima-u.ac.jp/~m-mat/MT/emt.html
email: m-mat @ math.sci.hiroshima-u.ac.jp (remove spaces)
*/
#include "random.h"
#include <blue/core/random.h>
#define NN 312
#define MM 156
#define MATRIX_A 0xB5026F5AA96619E9ULL
#define UM 0xFFFFFFFF80000000ULL /* Most significant 33 bits */
#define LM 0x7FFFFFFFULL /* Least significant 31 bits */
/* initializes mt[NN] with a seed */
static void init_genrand64(struct b_random_ctx *context, unsigned long long seed)
{
context->__mt19937.mt[0] = seed;
for (context->__mt19937.mti = 1; context->__mt19937.mti < NN;
context->__mt19937.mti++)
context->__mt19937.mt[context->__mt19937.mti]
= (6364136223846793005ULL
* (context->__mt19937.mt[context->__mt19937.mti - 1]
^ (context->__mt19937
.mt[context->__mt19937.mti - 1]
>> 62))
+ context->__mt19937.mti);
}
/* initialize by an array with array-length */
/* init_key is the array for initializing keys */
/* key_length is its length */
static void init_by_array64(
struct b_random_ctx *context, unsigned long long init_key[],
unsigned long long key_length)
{
unsigned long long i, j, k;
init_genrand64(context, 19650218ULL);
i = 1;
j = 0;
k = (NN > key_length ? NN : key_length);
for (; k; k--) {
context->__mt19937.mt[i]
= (context->__mt19937.mt[i]
^ ((context->__mt19937.mt[i - 1]
^ (context->__mt19937.mt[i - 1] >> 62))
* 3935559000370003845ULL))
+ init_key[j] + j; /* non linear */
i++;
j++;
if (i >= NN) {
context->__mt19937.mt[0] = context->__mt19937.mt[NN - 1];
i = 1;
}
if (j >= key_length)
j = 0;
}
for (k = NN - 1; k; k--) {
context->__mt19937.mt[i]
= (context->__mt19937.mt[i]
^ ((context->__mt19937.mt[i - 1]
^ (context->__mt19937.mt[i - 1] >> 62))
* 2862933555777941757ULL))
- i; /* non linear */
i++;
if (i >= NN) {
context->__mt19937.mt[0] = context->__mt19937.mt[NN - 1];
i = 1;
}
}
context->__mt19937.mt[0]
= 1ULL << 63; /* MSB is 1; assuring non-zero initial array */
}
/* generates a random number on [0, 2^64-1]-interval */
static unsigned long long genrand64_int64(struct b_random_ctx *context)
{
#if 0
/* This is the original implementation. It is replaced by the alternate implementation, below. */
int i;
unsigned long long x;
static unsigned long long mag01[2]={0ULL, MATRIX_A};
if (mti >= NN) { /* generate NN words at one time */
/* if init_genrand64() has not been called, */
/* a default initial seed is used */
if (mti == NN+1)
init_genrand64(5489ULL);
for (i=0;i<NN-MM;i++) {
x = (mt[i]&UM)|(mt[i+1]&LM);
mt[i] = mt[i+MM] ^ (x>>1) ^ mag01[(int)(x&1ULL)];
}
for (;i<NN-1;i++) {
x = (mt[i]&UM)|(mt[i+1]&LM);
mt[i] = mt[i+(MM-NN)] ^ (x>>1) ^ mag01[(int)(x&1ULL)];
}
x = (mt[NN-1]&UM)|(mt[0]&LM);
mt[NN-1] = mt[MM-1] ^ (x>>1) ^ mag01[(int)(x&1ULL)];
mti = 0;
}
x = mt[mti++];
x ^= (x >> 29) & 0x5555555555555555ULL;
x ^= (x << 17) & 0x71D67FFFEDA60000ULL;
x ^= (x << 37) & 0xFFF7EEE000000000ULL;
x ^= (x >> 43);
return x;
#else
/* This is the altered Cocoa with Love implementation. */
size_t i;
size_t j;
unsigned long long result;
if (context->__mt19937.mti >= NN) { /* generate NN words at one time */
size_t mid = NN / 2;
unsigned long long stateMid = context->__mt19937.mt[mid];
unsigned long long x;
unsigned long long y;
/* NOTE: this "untwist" code is modified from the original to
* improve performance, as described here:
* http://www.cocoawithlove.com/blog/2016/05/19/random-numbers.html
* These modifications are offered for use under the original
* icense at the top of this file.
*/
for (i = 0, j = mid; i != mid - 1; i++, j++) {
x = (context->__mt19937.mt[i] & UM)
| (context->__mt19937.mt[i + 1] & LM);
context->__mt19937.mt[i]
= context->__mt19937.mt[i + mid] ^ (x >> 1)
^ ((context->__mt19937.mt[i + 1] & 1) * MATRIX_A);
y = (context->__mt19937.mt[j] & UM)
| (context->__mt19937.mt[j + 1] & LM);
context->__mt19937.mt[j]
= context->__mt19937.mt[j - mid] ^ (y >> 1)
^ ((context->__mt19937.mt[j + 1] & 1) * MATRIX_A);
}
x = (context->__mt19937.mt[mid - 1] & UM) | (stateMid & LM);
context->__mt19937.mt[mid - 1] = context->__mt19937.mt[NN - 1]
^ (x >> 1)
^ ((stateMid & 1) * MATRIX_A);
y = (context->__mt19937.mt[NN - 1] & UM)
| (context->__mt19937.mt[0] & LM);
context->__mt19937.mt[NN - 1]
= context->__mt19937.mt[mid - 1] ^ (y >> 1)
^ ((context->__mt19937.mt[0] & 1) * MATRIX_A);
context->__mt19937.mti = 0;
}
result = context->__mt19937.mt[context->__mt19937.mti];
context->__mt19937.mti = context->__mt19937.mti + 1;
result ^= (result >> 29) & 0x5555555555555555ULL;
result ^= (result << 17) & 0x71D67FFFEDA60000ULL;
result ^= (result << 37) & 0xFFF7EEE000000000ULL;
result ^= (result >> 43);
return result;
#endif
}
/* generates a random number on [0,1]-real-interval */
double genrand64_real1(struct b_random_ctx *context)
{
return (genrand64_int64(context) >> 11) * (1.0 / 9007199254740991.0);
}
/* generates a random number on [0,1)-real-interval */
double genrand64_real2(struct b_random_ctx *context)
{
return (genrand64_int64(context) >> 11) * (1.0 / 9007199254740992.0);
}
/* generates a random number on (0,1)-real-interval */
double genrand64_real3(struct b_random_ctx *context)
{
return ((genrand64_int64(context) >> 12) + 0.5)
* (1.0 / 4503599627370496.0);
}
struct b_random_algorithm z__b_gen_mt19937 = {
.gen_name = "mt19937",
.gen_init = init_genrand64,
.gen_getrand = genrand64_int64,
};

103
core/random.c Normal file
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#include "random.h"
#include <blue/core/random.h>
#define GET_ALGORITHM_ID(flags) ((flags) & 0xFF)
extern struct b_random_algorithm z__b_gen_mt19937;
static struct b_random_algorithm *generators[] = {
[B_RANDOM_MT19937] = &z__b_gen_mt19937,
};
static size_t nr_generators = sizeof generators / sizeof generators[0];
static struct b_random_ctx g_global_ctx = {0};
static void init_global_ctx(void)
{
b_random_init(&g_global_ctx, B_RANDOM_MT19937);
}
struct b_random_ctx *b_random_global_ctx(void)
{
if (!g_global_ctx.__f) {
init_global_ctx();
}
return &g_global_ctx;
}
b_status b_random_init(struct b_random_ctx *ctx, b_random_flags flags)
{
unsigned int algorithm_id = GET_ALGORITHM_ID(flags);
if (algorithm_id >= nr_generators || !generators[algorithm_id]) {
return B_ERR_INVALID_ARGUMENT;
}
struct b_random_algorithm *algorithm = generators[algorithm_id];
ctx->__f = flags;
ctx->__a = algorithm;
unsigned long long seed;
if (flags & B_RANDOM_SECURE) {
seed = z__b_platform_random_seed_secure();
} else {
seed = z__b_platform_random_seed();
}
algorithm->gen_init(ctx, seed);
return B_SUCCESS;
}
unsigned long long b_random_next_int64(struct b_random_ctx *ctx)
{
if (!ctx->__a || !ctx->__a->gen_getrand) {
return 0;
}
return ctx->__a->gen_getrand(ctx);
}
double b_random_next_double(struct b_random_ctx *ctx)
{
unsigned long long v = b_random_next_int64(ctx);
if (!v) {
return 0.0;
}
return (double)(v >> 11) * (1.0 / 9007199254740991.0);
}
void b_random_next_bytes(struct b_random_ctx *ctx, unsigned char *out, size_t nbytes)
{
size_t n_qwords = 0;
n_qwords = nbytes >> 3;
if ((n_qwords << 3) < nbytes) {
n_qwords++;
}
size_t bytes_written = 0;
for (size_t i = 0; i < n_qwords; i++) {
uint64_t *dest = (uint64_t *)&out[bytes_written];
*dest = b_random_next_int64(ctx);
bytes_written += 8;
}
if (bytes_written == nbytes) {
return;
}
uint64_t padding = b_random_next_int64(ctx);
unsigned char *padding_bytes = (unsigned char *)&padding;
for (size_t i = 0; i < 8; i++) {
out[bytes_written++] = padding_bytes[i];
if (bytes_written == nbytes) {
break;
}
}
}

17
core/random.h Normal file
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#ifndef _BLUELIB_RANDOM_H_
#define _BLUELIB_RANDOM_H_
#include <stdint.h>
struct b_random_ctx;
struct b_random_algorithm {
const char *gen_name;
void(*gen_init)(struct b_random_ctx *, unsigned long long seed);
uint64_t(*gen_getrand)(struct b_random_ctx *);
};
extern uint64_t z__b_platform_random_seed();
extern uint64_t z__b_platform_random_seed_secure();
#endif

35
core/sys/darwin/random.c Normal file
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#include <fcntl.h>
#include <stdint.h>
#include <unistd.h>
uint64_t z__b_platform_random_seed()
{
int fd = open("/dev/urandom", O_RDONLY);
if (fd == -1) {
return (uint64_t)-1;
}
uint64_t v = 0;
if (read(fd, &v, sizeof v) != sizeof v) {
close(fd);
return (uint64_t)-1;
}
return v;
}
uint64_t z__b_platform_random_seed_secure()
{
int fd = open("/dev/random", O_RDONLY);
if (fd == -1) {
return (uint64_t)-1;
}
uint64_t v = 0;
if (read(fd, &v, sizeof v) != sizeof v) {
close(fd);
return (uint64_t)-1;
}
return v;
}

35
core/sys/linux/random.c Normal file
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@@ -0,0 +1,35 @@
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
uint64_t z__c_platform_random_seed()
{
int fd = open("/dev/urandom", O_RDONLY);
if (fd == -1) {
return (uint64_t)-1;
}
uint64_t v = 0;
if (read(fd, &v, sizeof v) != sizeof v) {
close(fd);
return (uint64_t)-1;
}
return v;
}
uint64_t z__c_platform_random_seed_secure()
{
int fd = open("/dev/random", O_RDONLY);
if (fd == -1) {
return (uint64_t)-1;
}
uint64_t v = 0;
if (read(fd, &v, sizeof v) != sizeof v) {
close(fd);
return (uint64_t)-1;
}
return v;
}