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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 09:59:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 09:59:14 +0000
commit01bb4a6c21c225e55a84ac606a3b213909023ba0 (patch)
treeb5875af84ac1bd4015afede1015bb1761e5e85b3 /xf86drmRandom.c
parentInitial commit. (diff)
downloadlibdrm-01bb4a6c21c225e55a84ac606a3b213909023ba0.tar.xz
libdrm-01bb4a6c21c225e55a84ac606a3b213909023ba0.zip
Adding upstream version 2.4.120.upstream/2.4.120
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'xf86drmRandom.c')
-rw-r--r--xf86drmRandom.c138
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+/* xf86drmRandom.c -- "Minimal Standard" PRNG Implementation
+ * Created: Mon Apr 19 08:28:13 1999 by faith@precisioninsight.com
+ *
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * 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 (including the next
+ * paragraph) 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
+ * PRECISION INSIGHT AND/OR ITS SUPPLIERS 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.
+ *
+ * Authors: Rickard E. (Rik) Faith <faith@valinux.com>
+ *
+ * DESCRIPTION
+ *
+ * This file contains a simple, straightforward implementation of the Park
+ * & Miller "Minimal Standard" PRNG [PM88, PMS93], which is a Lehmer
+ * multiplicative linear congruential generator (MLCG) with a period of
+ * 2^31-1.
+ *
+ * This implementation is intended to provide a reliable, portable PRNG
+ * that is suitable for testing a hash table implementation and for
+ * implementing skip lists.
+ *
+ * FUTURE ENHANCEMENTS
+ *
+ * If initial seeds are not selected randomly, two instances of the PRNG
+ * can be correlated. [Knuth81, pp. 32-33] describes a shuffling technique
+ * that can eliminate this problem.
+ *
+ * If PRNGs are used for simulation, the period of the current
+ * implementation may be too short. [LE88] discusses methods of combining
+ * MLCGs to produce much longer periods, and suggests some alternative
+ * values for A and M. [LE90 and Sch92] also provide information on
+ * long-period PRNGs.
+ *
+ * REFERENCES
+ *
+ * [Knuth81] Donald E. Knuth. The Art of Computer Programming. Volume 2:
+ * Seminumerical Algorithms. Reading, Massachusetts: Addison-Wesley, 1981.
+ *
+ * [LE88] Pierre L'Ecuyer. "Efficient and Portable Combined Random Number
+ * Generators". CACM 31(6), June 1988, pp. 742-774.
+ *
+ * [LE90] Pierre L'Ecuyer. "Random Numbers for Simulation". CACM 33(10,
+ * October 1990, pp. 85-97.
+ *
+ * [PM88] Stephen K. Park and Keith W. Miller. "Random Number Generators:
+ * Good Ones are Hard to Find". CACM 31(10), October 1988, pp. 1192-1201.
+ *
+ * [Sch92] Bruce Schneier. "Pseudo-Ransom Sequence Generator for 32-Bit
+ * CPUs". Dr. Dobb's Journal 17(2), February 1992, pp. 34, 37-38, 40.
+ *
+ * [PMS93] Stephen K. Park, Keith W. Miller, and Paul K. Stockmeyer. In
+ * "Technical Correspondence: Remarks on Choosing and Implementing Random
+ * Number Generators". CACM 36(7), July 1993, pp. 105-110.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "libdrm_macros.h"
+#include "xf86drm.h"
+#include "xf86drmRandom.h"
+
+#define RANDOM_MAGIC 0xfeedbeef
+
+drm_public void *drmRandomCreate(unsigned long seed)
+{
+ RandomState *state;
+
+ state = drmMalloc(sizeof(*state));
+ if (!state) return NULL;
+ state->magic = RANDOM_MAGIC;
+#if 0
+ /* Park & Miller, October 1988 */
+ state->a = 16807;
+ state->m = 2147483647;
+ state->check = 1043618065; /* After 10000 iterations */
+#else
+ /* Park, Miller, and Stockmeyer, July 1993 */
+ state->a = 48271;
+ state->m = 2147483647;
+ state->check = 399268537; /* After 10000 iterations */
+#endif
+ state->q = state->m / state->a;
+ state->r = state->m % state->a;
+
+ state->seed = seed;
+ /* Check for illegal boundary conditions,
+ and choose closest legal value. */
+ if (state->seed <= 0) state->seed = 1;
+ if (state->seed >= state->m) state->seed = state->m - 1;
+
+ return state;
+}
+
+drm_public int drmRandomDestroy(void *state)
+{
+ drmFree(state);
+ return 0;
+}
+
+drm_public unsigned long drmRandom(void *state)
+{
+ RandomState *s = (RandomState *)state;
+ unsigned long hi;
+ unsigned long lo;
+
+ hi = s->seed / s->q;
+ lo = s->seed % s->q;
+ s->seed = s->a * lo - s->r * hi;
+ if ((s->a * lo) <= (s->r * hi)) s->seed += s->m;
+
+ return s->seed;
+}
+
+drm_public double drmRandomDouble(void *state)
+{
+ RandomState *s = (RandomState *)state;
+
+ return (double)drmRandom(state)/(double)s->m;
+}