Mercurial > hg > openjdk > lambda > jdk
view test/java/math/BigInteger/StringConstructorOverflow.java @ 10542:0734e1584d9d
6910473: java.math.BigInteger.bitLength() may return negative "int" on large numbers
8021203: BigInteger.doubleValue/floatValue returns 0.0 instead of Infinity
8021204: Constructor BigInteger(String val, int radix) doesn't detect overflow
8022780: Incorrect BigInteger division because of MutableBigInteger.bitLength() overflow
Summary: Prevent construction of overflowed BigIntegers.
Reviewed-by: bpb, darcy, psandoz
Contributed-by: Dmitry Nadezhin <dmitry.nadezhin@oracle.com>
author | bpb |
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date | Wed, 30 Oct 2013 17:45:12 -0700 |
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/* * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @ test * @bug 8021204 * @summary Test constructor BigInteger(String val, int radix) on very long string * @author Dmitry Nadezhin */ import java.math.BigInteger; public class StringConstructorOverflow { // String with hexadecimal value pow(2,pow(2,34))+1 private static String makeLongHexString() { StringBuilder sb = new StringBuilder(); sb.append('1'); for (int i = 0; i < (1 << 30) - 1; i++) { sb.append('0'); } sb.append('1'); return sb.toString(); } public static void main(String[] args) { try { BigInteger bi = new BigInteger(makeLongHexString(), 16); if (bi.compareTo(BigInteger.ONE) <= 0) throw new RuntimeException("Incorrect result " + bi.toString()); } catch (ArithmeticException e) { // expected System.out.println("Overflow is reported by ArithmeticException, as expected"); } catch (OutOfMemoryError e) { // possible System.out.println("OutOfMemoryError"); System.out.println("Run jtreg with -javaoption:-Xmx8g"); } } }