/*

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 * 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.

 *

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 */

/* @test

   @bug 4508058 6378911

   @summary Check if UTF8 decoder handles BOM correctly

 */

import java.io.IOException;

import java.nio.BufferOverflowException;

import java.nio.*;

import java.nio.charset.*;

/* The fix for 6378911 is to backout the change we made for 4508058,

   so this regtest is modified accordingly to leave the beginning

   BOM untouched during decoding.

 */

public class TestUTF8BOM {

    private static ByteBuffer bf = ByteBuffer.allocateDirect(1000);

    private static void testDecode(String expected, byte[] input)

        throws Exception

    {

        String out = new String(input, "utf8");

        if (!out.equals(expected)) {

            failureReport (out, expected);

            throw new Exception("UTF_8 Decoding test failed");

        }

        //try directBuffer.

        bf.clear();

        bf.put(input).flip();

        out = Charset.forName("UTF-8")

                     .decode(bf)

                     .toString();

        if (!out.equals(expected)) {

            failureReport (out, expected);

            throw new Exception("UTF_8 Decoding test failed(directbuffer)");

        }

    }

    private static void failureReport(String testStr,

                                      String expected) {

        System.err.println ("Expected Characters:");

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

            System.out.println("expected char[" + i + "] : " +

                              Integer.toHexString((int)expected.charAt(i)) +

                              "  obtained char[" + i + "] : " +

                              Integer.toHexString((int)testStr.charAt(i)));

        }

    }

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

            // Test 1: with BOM at beginning

            testDecode("\ufeff\u0092\u0093",

                        new byte[] { (byte) 0xef, (byte) 0xbb, (byte) 0xbf,

                                     (byte) 0xc2, (byte) 0x92,

                                     (byte) 0xc2, (byte) 0x93 });

            // Test 2: with BOM at middle

            testDecode("\u9200\ufeff\u9300",

                        new byte[] { (byte) 0xe9, (byte) 0x88, (byte) 0x80,

                                     (byte) 0xef, (byte) 0xbb, (byte) 0xbf,

                                     (byte) 0xe9, (byte) 0x8c, (byte) 0x80 });

            // Test 3: with BOM at end

            testDecode("\u9200\u9300\ufeff",

                        new byte[] { (byte) 0xe9, (byte) 0x88, (byte) 0x80,

                                     (byte) 0xe9, (byte) 0x8c, (byte) 0x80,

                                     (byte) 0xef, (byte) 0xbb, (byte) 0xbf });

            System.err.println ("\nPASSED UTF-8 decode BOM test");

   }

}