1 /*
   2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /* @test
  25  * @bug 8058875
  26  * @summary CharsetEncoder.maxBytesPerChar() should return 4 for UTF-8
  27  */
  28 
  29 import java.nio.ByteBuffer;
  30 import java.nio.CharBuffer;
  31 import java.nio.charset.Charset;
  32 import java.nio.charset.CharsetEncoder;
  33 import java.nio.charset.CoderResult;
  34 import java.nio.charset.CodingErrorAction;
  35 
  36 public class UTF8Has4ByteChars {
  37     private static CharsetEncoder encoder;
  38     private static int bufferSize;
  39 
  40     public static void main(String[] args) {
  41         Charset cs = Charset.forName("UTF-8");
  42         encoder = cs.newEncoder()
  43                     .onMalformedInput(CodingErrorAction.REPLACE)
  44                     .onUnmappableCharacter(CodingErrorAction.REPLACE);
  45 
  46         bufferSize = (int)encoder.maxBytesPerChar();
  47 
  48         for (Integer i : new Integer[] {0x10000, 0x24B62, 0x10FFFF}) {
  49             test(new String(new int[] {i.intValue()}, 0, 1));
  50         }
  51     }
  52 
  53     private static void test(String s) {
  54         CharBuffer cb = CharBuffer.wrap(s.toCharArray());
  55         encoder.encode(cb, ByteBuffer.wrap(new byte[bufferSize]), true);
  56         if (cb.hasRemaining()) {
  57             throw new RuntimeException("Buffer of size " + bufferSize +
  58                                        " isn't enough to hold a char");
  59         }
  60     }
  61 }