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370 lines
11 KiB
C
370 lines
11 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 7 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2018 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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| http://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: Rasmus Lerdorf <rasmus@php.net> |
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| Zeev Suraski <zeev@zend.com> |
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| Pedro Melo <melo@ip.pt> |
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| Sterling Hughes <sterling@php.net> |
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| |
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| Based on code from: Richard J. Wagner <rjwagner@writeme.com> |
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| Makoto Matsumoto <matumoto@math.keio.ac.jp> |
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| Takuji Nishimura |
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| Shawn Cokus <Cokus@math.washington.edu> |
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+----------------------------------------------------------------------+
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*/
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#include "php.h"
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#include "php_rand.h"
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#include "php_mt_rand.h"
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/* MT RAND FUNCTIONS */
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/*
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The following php_mt_...() functions are based on a C++ class MTRand by
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Richard J. Wagner. For more information see the web page at
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http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/VERSIONS/C-LANG/MersenneTwister.h
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Mersenne Twister random number generator -- a C++ class MTRand
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Based on code by Makoto Matsumoto, Takuji Nishimura, and Shawn Cokus
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Richard J. Wagner v1.0 15 May 2003 rjwagner@writeme.com
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The Mersenne Twister is an algorithm for generating random numbers. It
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was designed with consideration of the flaws in various other generators.
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The period, 2^19937-1, and the order of equidistribution, 623 dimensions,
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are far greater. The generator is also fast; it avoids multiplication and
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division, and it benefits from caches and pipelines. For more information
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see the inventors' web page at http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
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Reference
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M. Matsumoto and T. Nishimura, "Mersenne Twister: A 623-Dimensionally
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Equidistributed Uniform Pseudo-Random Number Generator", ACM Transactions on
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Modeling and Computer Simulation, Vol. 8, No. 1, January 1998, pp 3-30.
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Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
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Copyright (C) 2000 - 2003, Richard J. Wagner
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The names of its contributors may not be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define N MT_N /* length of state vector */
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#define M (397) /* a period parameter */
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#define hiBit(u) ((u) & 0x80000000U) /* mask all but highest bit of u */
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#define loBit(u) ((u) & 0x00000001U) /* mask all but lowest bit of u */
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#define loBits(u) ((u) & 0x7FFFFFFFU) /* mask the highest bit of u */
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#define mixBits(u, v) (hiBit(u)|loBits(v)) /* move hi bit of u to hi bit of v */
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#define twist(m,u,v) (m ^ (mixBits(u,v)>>1) ^ ((uint32_t)(-(int32_t)(loBit(v))) & 0x9908b0dfU))
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#define twist_php(m,u,v) (m ^ (mixBits(u,v)>>1) ^ ((uint32_t)(-(int32_t)(loBit(u))) & 0x9908b0dfU))
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/* {{{ php_mt_initialize
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*/
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static inline void php_mt_initialize(uint32_t seed, uint32_t *state)
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{
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/* Initialize generator state with seed
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See Knuth TAOCP Vol 2, 3rd Ed, p.106 for multiplier.
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In previous versions, most significant bits (MSBs) of the seed affect
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only MSBs of the state array. Modified 9 Jan 2002 by Makoto Matsumoto. */
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register uint32_t *s = state;
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register uint32_t *r = state;
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register int i = 1;
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*s++ = seed & 0xffffffffU;
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for( ; i < N; ++i ) {
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*s++ = ( 1812433253U * ( *r ^ (*r >> 30) ) + i ) & 0xffffffffU;
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r++;
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}
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}
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/* }}} */
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/* {{{ php_mt_reload
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*/
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static inline void php_mt_reload(void)
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{
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/* Generate N new values in state
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Made clearer and faster by Matthew Bellew (matthew.bellew@home.com) */
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register uint32_t *state = BG(state);
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register uint32_t *p = state;
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register int i;
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if (BG(mt_rand_mode) == MT_RAND_MT19937) {
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for (i = N - M; i--; ++p)
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*p = twist(p[M], p[0], p[1]);
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for (i = M; --i; ++p)
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*p = twist(p[M-N], p[0], p[1]);
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*p = twist(p[M-N], p[0], state[0]);
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}
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else {
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for (i = N - M; i--; ++p)
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*p = twist_php(p[M], p[0], p[1]);
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for (i = M; --i; ++p)
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*p = twist_php(p[M-N], p[0], p[1]);
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*p = twist_php(p[M-N], p[0], state[0]);
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}
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BG(left) = N;
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BG(next) = state;
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}
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/* }}} */
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/* {{{ php_mt_srand
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*/
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PHPAPI void php_mt_srand(uint32_t seed)
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{
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/* Seed the generator with a simple uint32 */
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php_mt_initialize(seed, BG(state));
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php_mt_reload();
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/* Seed only once */
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BG(mt_rand_is_seeded) = 1;
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}
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/* }}} */
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/* {{{ php_mt_rand
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*/
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PHPAPI uint32_t php_mt_rand(void)
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{
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/* Pull a 32-bit integer from the generator state
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Every other access function simply transforms the numbers extracted here */
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register uint32_t s1;
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if (UNEXPECTED(!BG(mt_rand_is_seeded))) {
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php_mt_srand(GENERATE_SEED());
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}
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if (BG(left) == 0) {
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php_mt_reload();
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}
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--BG(left);
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s1 = *BG(next)++;
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s1 ^= (s1 >> 11);
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s1 ^= (s1 << 7) & 0x9d2c5680U;
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s1 ^= (s1 << 15) & 0xefc60000U;
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return ( s1 ^ (s1 >> 18) );
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}
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/* }}} */
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/* {{{ proto void mt_srand([int seed])
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Seeds Mersenne Twister random number generator */
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PHP_FUNCTION(mt_srand)
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{
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zend_long seed = 0;
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zend_long mode = MT_RAND_MT19937;
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ZEND_PARSE_PARAMETERS_START(0, 2)
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Z_PARAM_OPTIONAL
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Z_PARAM_LONG(seed)
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Z_PARAM_LONG(mode)
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ZEND_PARSE_PARAMETERS_END();
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if (ZEND_NUM_ARGS() == 0)
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seed = GENERATE_SEED();
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switch (mode) {
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case MT_RAND_PHP:
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BG(mt_rand_mode) = MT_RAND_PHP;
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break;
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default:
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BG(mt_rand_mode) = MT_RAND_MT19937;
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}
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php_mt_srand(seed);
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}
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/* }}} */
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static uint32_t rand_range32(uint32_t umax) {
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uint32_t result, limit;
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result = php_mt_rand();
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/* Special case where no modulus is required */
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if (UNEXPECTED(umax == UINT32_MAX)) {
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return result;
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}
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/* Increment the max so the range is inclusive of max */
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umax++;
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/* Powers of two are not biased */
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if ((umax & (umax - 1)) == 0) {
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return result & (umax - 1);
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}
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/* Ceiling under which UINT32_MAX % max == 0 */
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limit = UINT32_MAX - (UINT32_MAX % umax) - 1;
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/* Discard numbers over the limit to avoid modulo bias */
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while (UNEXPECTED(result > limit)) {
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result = php_mt_rand();
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}
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return result % umax;
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}
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#if ZEND_ULONG_MAX > UINT32_MAX
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static uint64_t rand_range64(uint64_t umax) {
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uint64_t result, limit;
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result = php_mt_rand();
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result = (result << 32) | php_mt_rand();
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/* Special case where no modulus is required */
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if (UNEXPECTED(umax == UINT64_MAX)) {
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return result;
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}
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/* Increment the max so the range is inclusive of max */
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umax++;
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/* Powers of two are not biased */
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if ((umax & (umax - 1)) == 0) {
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return result & (umax - 1);
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}
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/* Ceiling under which UINT64_MAX % max == 0 */
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limit = UINT64_MAX - (UINT64_MAX % umax) - 1;
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/* Discard numbers over the limit to avoid modulo bias */
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while (UNEXPECTED(result > limit)) {
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result = php_mt_rand();
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result = (result << 32) | php_mt_rand();
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}
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return result % umax;
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}
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#endif
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/* {{{ php_mt_rand_range
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*/
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PHPAPI zend_long php_mt_rand_range(zend_long min, zend_long max)
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{
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zend_ulong umax = max - min;
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#if ZEND_ULONG_MAX > UINT32_MAX
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if (umax > UINT32_MAX) {
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return (zend_long) (rand_range64(umax) + min);
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}
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#endif
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return (zend_long) (rand_range32(umax) + min);
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}
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/* }}} */
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/* {{{ php_mt_rand_common
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* rand() allows min > max, mt_rand does not */
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PHPAPI zend_long php_mt_rand_common(zend_long min, zend_long max)
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{
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int64_t n;
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if (BG(mt_rand_mode) == MT_RAND_MT19937) {
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return php_mt_rand_range(min, max);
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}
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/* Legacy mode deliberately not inside php_mt_rand_range()
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* to prevent other functions being affected */
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n = (int64_t)php_mt_rand() >> 1;
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RAND_RANGE_BADSCALING(n, min, max, PHP_MT_RAND_MAX);
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return n;
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}
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/* }}} */
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/* {{{ proto int mt_rand([int min, int max])
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Returns a random number from Mersenne Twister */
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PHP_FUNCTION(mt_rand)
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{
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zend_long min;
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zend_long max;
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int argc = ZEND_NUM_ARGS();
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if (argc == 0) {
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// genrand_int31 in mt19937ar.c performs a right shift
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RETURN_LONG(php_mt_rand() >> 1);
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}
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ZEND_PARSE_PARAMETERS_START(2, 2)
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Z_PARAM_LONG(min)
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Z_PARAM_LONG(max)
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ZEND_PARSE_PARAMETERS_END();
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if (UNEXPECTED(max < min)) {
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php_error_docref(NULL, E_WARNING, "max(" ZEND_LONG_FMT ") is smaller than min(" ZEND_LONG_FMT ")", max, min);
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RETURN_FALSE;
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}
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RETURN_LONG(php_mt_rand_common(min, max));
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}
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/* }}} */
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/* {{{ proto int mt_getrandmax(void)
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Returns the maximum value a random number from Mersenne Twister can have */
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PHP_FUNCTION(mt_getrandmax)
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{
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if (zend_parse_parameters_none() == FAILURE) {
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return;
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}
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/*
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* Melo: it could be 2^^32 but we only use 2^^31 to maintain
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* compatibility with the previous php_rand
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*/
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RETURN_LONG(PHP_MT_RAND_MAX); /* 2^^31 */
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}
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/* }}} */
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PHP_MINIT_FUNCTION(mt_rand)
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{
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REGISTER_LONG_CONSTANT("MT_RAND_MT19937", MT_RAND_MT19937, CONST_CS | CONST_PERSISTENT);
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REGISTER_LONG_CONSTANT("MT_RAND_PHP", MT_RAND_PHP, CONST_CS | CONST_PERSISTENT);
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return SUCCESS;
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}
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: noet sw=4 ts=4 fdm=marker
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* vim<600: noet sw=4 ts=4
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*/
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