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d5cc7e9109
The php_random.h header already defines them as `PHPAPI` and they actually are part of the public API. Co-authored-by: Arnaud Le Blanc <arnaud.lb@gmail.com>
123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/*
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+----------------------------------------------------------------------+
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| Copyright (c) The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| https://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Sascha Schumann <sascha@schumann.cx> |
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| Go Kudo <zeriyoshi@php.net> |
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+----------------------------------------------------------------------+
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "php.h"
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#include "php_random.h"
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#include "Zend/zend_exceptions.h"
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/*
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* combinedLCG() returns a pseudo random number in the range of (0, 1).
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* The function combines two CGs with periods of
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* 2^31 - 85 - 1 and 2^31 - 249 - 1. The period of this function
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* is equal to the product of the two underlying periods, divided
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* by factors shared by the underlying periods, i.e. 2.3 * 10^18.
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*
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* see: https://library.sciencemadness.org/lanl1_a/lib-www/numerica/f7-1.pdf
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*/
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#define MODMULT(a, b, c, m, s) q = s / a; s = b * (s - a * q) - c * q; if (s < 0) s += m
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PHPAPI void php_random_combinedlcg_seed64(php_random_status_state_combinedlcg *state, uint64_t seed)
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{
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state->state[0] = seed & 0xffffffffU;
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state->state[1] = seed >> 32;
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}
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static php_random_result generate(void *state)
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{
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php_random_status_state_combinedlcg *s = state;
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int32_t q, z;
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/* s->state[0] = (s->state[0] * 40014) % 2147483563; */
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MODMULT(53668, 40014, 12211, 2147483563L, s->state[0]);
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/* s->state[1] = (s->state[1] * 40692) % 2147483399; */
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MODMULT(52774, 40692, 3791, 2147483399L, s->state[1]);
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z = s->state[0] - s->state[1];
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if (z < 1) {
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z += 2147483562;
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}
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return (php_random_result){
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.size = sizeof(uint32_t),
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.result = (uint64_t) z,
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};
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}
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static zend_long range(void *state, zend_long min, zend_long max)
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{
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return php_random_range((php_random_algo_with_state){
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.algo = &php_random_algo_combinedlcg,
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.state = state,
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}, min, max);
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}
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static bool serialize(void *state, HashTable *data)
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{
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php_random_status_state_combinedlcg *s = state;
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zval t;
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for (uint32_t i = 0; i < 2; i++) {
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ZVAL_STR(&t, php_random_bin2hex_le(&s->state[i], sizeof(uint32_t)));
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zend_hash_next_index_insert(data, &t);
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}
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return true;
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}
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static bool unserialize(void *state, HashTable *data)
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{
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php_random_status_state_combinedlcg *s = state;
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zval *t;
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for (uint32_t i = 0; i < 2; i++) {
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t = zend_hash_index_find(data, i);
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if (!t || Z_TYPE_P(t) != IS_STRING || Z_STRLEN_P(t) != (2 * sizeof(uint32_t))) {
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return false;
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}
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if (!php_random_hex2bin_le(Z_STR_P(t), &s->state[i])) {
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return false;
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}
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}
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return true;
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}
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PHPAPI const php_random_algo php_random_algo_combinedlcg = {
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sizeof(php_random_status_state_combinedlcg),
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generate,
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range,
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serialize,
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unserialize
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};
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/* {{{ php_random_combinedlcg_seed_default */
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PHPAPI void php_random_combinedlcg_seed_default(php_random_status_state_combinedlcg *state)
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{
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uint64_t seed = 0;
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if (php_random_bytes_silent(&seed, sizeof(seed)) == FAILURE) {
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seed = php_random_generate_fallback_seed();
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}
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php_random_combinedlcg_seed64(state, seed);
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}
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/* }}} */
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