test/jdk/java/nio/charset/CharsetDecoder/ASCIIDecode.java

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/* @test
 * @bug 8283325
 * @summary Ensure that decoding to ASCII from a stream with a non-ASCII
 *          character correctly decodes up until the byte in error.
 */

import java.nio.*;
import java.nio.charset.*;
import java.util.Arrays;

public class ASCIIDecode {

    public static void main(String[] args) throws Exception {
        final Charset ascii = Charset.forName("US-ASCII");
        final CharsetDecoder decoder = ascii.newDecoder();

        byte[] ba = new byte[] { 0x60, 0x60, 0x60, (byte)0xFF };

        // Repeat enough times to test that interpreter and JIT:ed versions
        // behave the same (without the patch for 8283325 this fails within
        // 50 000 iterations on the system used for verification)
        for (int i = 0; i < 100_000; i++) {
            ByteBuffer bb = ByteBuffer.wrap(ba);
            char[] ca = new char[4];
            CharBuffer cb = CharBuffer.wrap(ca);
            CoderResult buf = decoder.decode(bb, cb, true);
            if (ca[0] != 0x60 || ca[1] != 0x60 || ca[2] != 0x60) {
                throw new RuntimeException("Unexpected output on iteration " + i);
            }
        }
    }
}