/*

 * Copyright (c) 2017, 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     8190997

 * @summary Test verifies that ImageIO.read() throws proper IIOException

 *          when we have a PNG image with color type PNG_COLOR_PALETTE but

 *          missing the required PLTE chunk.

 * @run     main PngPLTEChunkMissingTest

 */

import java.io.ByteArrayInputStream;

import java.io.InputStream;

import java.util.Base64;

import javax.imageio.IIOException;

import javax.imageio.ImageIO;

public class PngPLTEChunkMissingTest {

    // PNG image stream missing the required PLTE chunk

    private static String inputImageBase64 = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAAB"

            + "CAMAAAA6fptVAAAACklEQVQYV2P4DwABAQEAWk1v8QAAAABJRU5ErkJgggo=";

    public static void main(String[] args) throws Exception {

        byte[] inputBytes = Base64.getDecoder().decode(inputImageBase64);

        InputStream in = new ByteArrayInputStream(inputBytes);

        /*

         * Attempt to read a PNG image of color type PNG_COLOR_PALETTE

         * but missing the required PLTE chunk.

         */

        try {

            ImageIO.read(in);

        } catch (IIOException e) {

            /*

             * We expect ImageIO to throw IIOException with proper message

             * instead of throwing NullPointerException.

             */

            Throwable cause = e.getCause();

            if (cause == null ||

                (!(cause.getMessage().

                 equals("Required PLTE chunk missing"))))

            {

                throw e;

            }

        }

    }

}