jdk/test/java/io/CharArrayReader/OverflowInRead.java

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/* @test
 * @bug 8163518
 * @summary Integer overflow when reading in large buffer
 * @ignore This test has huge memory requirements
 * @requires (sun.arch.data.model == "64" & os.maxMemory > 8g)
 * @run main/othervm -Xmx8g OverflowInRead
 */

import java.io.CharArrayReader;

public class OverflowInRead {
    public static void main(String[] args) throws Exception {
        char[] a = "_123456789_123456789_123456789_123456789"
                .toCharArray(); // a.length > 33
        try (CharArrayReader car = new CharArrayReader(a)) {
            int len1 = 33;
            char[] buf1 = new char[len1];
            if (car.read(buf1, 0, len1) != len1)
                throw new Exception("Expected to read " + len1 + " chars");

            int len2 = Integer.MAX_VALUE - 32;
            char[] buf2 = new char[len2];
            int expLen2 = a.length - len1;
            if (car.read(buf2, 0, len2) != expLen2)
                throw new Exception("Expected to read " + expLen2 + " chars");
        }
    }
}