/*

 * Copyright (c) 2001, 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 4396708

 * @summary Test URL encoder and decoder on a string that contains

 * surrogate pairs.

 *

 */

import java.io.*;

import java.net.*;

/*

 * Surrogate pairs are two character Unicode sequences where the first

 * character lies in the range [d800, dbff] and the second character lies

 * in the range [dc00, dfff]. They are used as an escaping mechanism to add

 * 1M more characters to Unicode.

 */

public class SurrogatePairs {

    static String[] testStrings = {"\uD800\uDC00",

                                   "\uD800\uDFFF",

                                   "\uDBFF\uDC00",

                                   "\uDBFF\uDFFF",

                                   "1\uDBFF\uDC00",

                                   "@\uDBFF\uDC00",

                                   "\uDBFF\uDC001",

                                   "\uDBFF\uDC00@",

                                   "\u0101\uDBFF\uDC00",

                                   "\uDBFF\uDC00\u0101"

    };

    static String[] correctEncodings = {"%F0%90%80%80",

                                        "%F0%90%8F%BF",

                                        "%F4%8F%B0%80",

                                        "%F4%8F%BF%BF",

                                        "1%F4%8F%B0%80",

                                        "%40%F4%8F%B0%80",

                                        "%F4%8F%B0%801",

                                        "%F4%8F%B0%80%40",

                                        "%C4%81%F4%8F%B0%80",

                                        "%F4%8F%B0%80%C4%81"

    };

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

        for (int i=0; i < testStrings.length; i++) {

            test(testStrings[i], correctEncodings[i]);

        }

    }

    private static void test(String str, String correctEncoding)

        throws Exception {

        System.out.println("Unicode bytes of test string are: "

                           + getHexBytes(str));

        String encoded = URLEncoder.encode(str, "UTF-8");

        System.out.println("URLEncoding is: " + encoded);

        if (encoded.equals(correctEncoding))

            System.out.println("The encoding is correct!");

        else {

            throw new Exception("The encoding is incorrect!" +

                                " It should be " + correctEncoding);

        }

        String decoded = URLDecoder.decode(encoded, "UTF-8");

        System.out.println("Unicode bytes for URLDecoding are: "

                           + getHexBytes(decoded));

        if (str.equals(decoded))

            System.out.println("The decoding is correct");

        else {

            throw new Exception("The decoded is not equal to the original");

        }

        System.out.println("---");

    }

    private static String getHexBytes(String s) throws Exception {

        StringBuffer sb = new StringBuffer();

        for (int i = 0; i < s.length(); i++) {

            int a = s.charAt(i);

            int b1 = (a >>8) & 0xff;

            int b2 = (byte)a;

            int b11 = (b1>>4) & 0x0f;

            int b12 = b1 & 0x0f;

            int b21 = (b2 >>4) & 0x0f;

            int b22 = b2 & 0x0f;

            sb.append(Integer.toHexString(b11));

            sb.append(Integer.toHexString(b12));

            sb.append(Integer.toHexString(b21));

            sb.append(Integer.toHexString(b22));

            sb.append(' ');

        }

        return sb.toString();

    }

}