111 lines
3.6 KiB
Java
111 lines
3.6 KiB
Java
/*
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* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.util.random.*;
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import jdk.internal.util.random.RandomSupport;
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/**
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* @test
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* @summary RandomSupport.convertSeedBytesToLongs sign extension overwrites previous bytes.
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* @bug 8282144 8294509
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* @modules java.base/jdk.internal.util.random
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* @run main T8282144
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* @key randomness
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*/
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public class T8282144 {
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public static void main(String[] args) {
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testLongs();
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testInts();
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}
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private static void testLongs() {
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RandomGenerator rng = RandomGeneratorFactory.of("L64X128MixRandom").create(42);
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for (int i = 1; i < 8; i++) {
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byte[] seed = new byte[i];
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for (int j = 0; j < 10; j++) {
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rng.nextBytes(seed);
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long[] existing = RandomSupport.convertSeedBytesToLongs(seed, 1, 1);
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long[] testing = convertSeedBytesToLongsFixed(seed, 1, 1);
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for (int k = 0; k < existing.length; k++) {
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if (existing[k] != testing[k]) {
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throw new RuntimeException("convertSeedBytesToLongs incorrect");
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}
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}
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}
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}
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}
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private static void testInts() {
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RandomGenerator rng = RandomGeneratorFactory.of("L64X128MixRandom").create(42);
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for (int i = 1; i < 8; i++) {
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byte[] seed = new byte[i];
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for (int j = 0; j < 10; j++) {
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rng.nextBytes(seed);
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int[] existing = RandomSupport.convertSeedBytesToInts(seed, 1, 1);
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int[] testing = convertSeedBytesToIntsFixed(seed, 1, 1);
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for (int k = 0; k < existing.length; k++) {
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if (existing[k] != testing[k]) {
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throw new RuntimeException("convertSeedBytesToInts incorrect");
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}
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}
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}
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}
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}
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public static long[] convertSeedBytesToLongsFixed(byte[] seed, int n, int z) {
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final long[] result = new long[n];
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final int m = Math.min(seed.length, n << 3);
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// Distribute seed bytes into the words to be formed.
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for (int j = 0; j < m; j++) {
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result[j >> 3] = (result[j >> 3] << 8) | (seed[j] & 0xff);
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}
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return result;
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}
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public static int[] convertSeedBytesToIntsFixed(byte[] seed, int n, int z) {
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final int[] result = new int[n];
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final int m = Math.min(seed.length, n << 2);
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// Distribute seed bytes into the words to be formed.
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for (int j = 0; j < m; j++) {
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result[j >> 2] = (result[j >> 2] << 8) | (seed[j] & 0xff);
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}
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return result;
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}
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}
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