1 /*
   2  * Copyright (c) 2017, 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  /*
  25  * @test
  26  * @run main/native StringPlatformChars
  27  */
  28 import java.util.Arrays;
  29 
  30 public class StringPlatformChars {
  31 
  32     private static final String JNU_ENCODING = System.getProperty("sun.jnu.encoding");
  33 
  34     public static void main(String... args) throws Exception {
  35         System.loadLibrary("stringPlatformChars");
  36 
  37         // Test varying lengths, provoking different allocation paths
  38         StringBuilder unicodeSb = new StringBuilder();
  39         StringBuilder asciiSb = new StringBuilder();
  40         StringBuilder latinSb = new StringBuilder();
  41 
  42         for (int i = 0; i < 2000; i++) {
  43             unicodeSb.append('\uFEFE');
  44             testString(unicodeSb.toString());
  45 
  46             asciiSb.append('x');
  47             testString(asciiSb.toString());
  48 
  49             latinSb.append('\u00FE');
  50             testString(latinSb.toString());
  51 
  52             testString(latinSb.toString() + asciiSb.toString() + unicodeSb.toString());
  53         }
  54 
  55         // Exhaustively test simple Strings made up of all possible chars:
  56         for (char c = '\u0001'; c < Character.MAX_VALUE; c++) {
  57             testString(String.valueOf(c));
  58         }
  59         // Special case: \u0000 is treated as end-of-string in the native code,
  60         // so strings with it should be truncated:
  61         if (getBytes("\u0000abcdef").length != 0 ||
  62             getBytes("a\u0000bcdef").length != 1) {
  63             System.out.println("Mismatching values for strings including \\u0000");
  64             throw new AssertionError();
  65         }
  66     }
  67 
  68     private static void testString(String s) throws Exception {
  69         byte[] nativeBytes = getBytes(s);
  70         byte[] stringBytes = s.getBytes(JNU_ENCODING);
  71 
  72         if (!Arrays.equals(nativeBytes, stringBytes)) {
  73             System.out.println("Mismatching values for: '" + s + "'");
  74             System.out.println("Native: " + Arrays.toString(nativeBytes));
  75             System.out.println("String: " + Arrays.toString(stringBytes));
  76             throw new AssertionError(s);
  77         }
  78 
  79         String javaNewS = new String(nativeBytes, JNU_ENCODING);
  80         String nativeNewS = newString(nativeBytes);
  81         if (!javaNewS.equals(nativeNewS)) {
  82             System.out.println("New string via native doesn't match via java: '" + javaNewS + "' and '" + nativeNewS + "'");
  83             throw new AssertionError(s);
  84         }
  85     }
  86 
  87     static native byte[] getBytes(String string);
  88 
  89     static native String newString(byte[] bytes);
  90 }