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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.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
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  /* @test
   * @bug 4712786
   * @summary Check charsets against reference files
   *
   * @build Util
   * @run main Check shift_jis ref.shift_jis
   * @run main/othervm -Dsun.nio.cs.map=Windows-31J/Shift_JIS Check shift_jis ref.windows-31j
   */
  
  import java.io.*;
  import java.nio.*;
  import java.nio.channels.*;
  import java.nio.charset.*;
  import java.util.*;
  import java.util.regex.*;
  
  
  public class Check {
  
      private static PrintStream log = System.err;
  
      private static final int UNICODE_SIZE = (1 << 16);
  
      private final String csName;
      private final String refName;
      private byte[][] bytes = new byte[UNICODE_SIZE][]; // Indexed by char
  
      private int errors = 0;
  
      private Check(String csn, String refn) {
          csName = csn;
          refName = refn;
      }
  
      private Check load()
          throws IOException
      {
          File fn = new File(System.getProperty("test.src", "."), refName);
          FileChannel fc = new FileInputStream(fn).getChannel();
          ByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
          CharBuffer cb = Charset.forName("US-ASCII").decode(bb);
          Pattern p = Pattern.compile("^(\\p{XDigit}+) +(\\p{XDigit}+)$",
                                      Pattern.MULTILINE);
          Matcher m = p.matcher(cb);
          while (m.find()) {
              char c = (char)Integer.parseInt(m.group(1), 16);
              String v = m.group(2);
              int nb = v.length() >> 1;
              byte[] ba = new byte[nb];
              for (int i = 0; i < nb; i++) {
                  ba[i] = (byte)Integer.parseInt(v.substring(i << 1, (i << 1) + 2),
                                                 16);
              }
              bytes[c] = ba;
          }
          return this;
      }
  
      private void error() {
          if (++errors >= 100)
              throw new RuntimeException("100 errors occurred (there might be more)");
      }
  
      private void mismatch(String s, byte[] expected, byte[] got) {
          log.println("Encoding mismatch on \""
                      + Util.toString(s)
                      + "\": Expected {"
                      + Util.toString(expected)
                      + "}, got {"
                      + Util.toString(got)
                      + "}");
          error();
      }
  
      private void mismatch(int i, byte[] ba, String expected, String got) {
          log.println("Decoding mismatch on \""
                     + Util.toString((char)i)
                     + "\", input {"
                     + Util.toString(ba)
                     + "}: Expected \""
                     + Util.toString(expected)
                     + "\", got \""
                     + Util.toString(got)
                     + "\"");
         error();
     }
 
     private void check()
         throws IOException
     {
 
         // String.getBytes(String csn)
         for (int i = 0; i < UNICODE_SIZE; i++) {
             if (bytes[i] == null)
                 continue;
             String s = new String(new char[]{ (char)i });
             byte[] ba = s.getBytes(csName);
             if (Util.cmp(ba, bytes[i]) >= 0)
                 mismatch(s, bytes[i], ba);
         }
         log.println("String.getBytes(\"" + csName + "\") okay");
 
         // String(byte[] ba, String csn)
         for (int i = 0; i < UNICODE_SIZE; i++) {
             if (bytes[i] == null)
                 continue;
             String r = new String(new char[]{ (char)i });
             String s = new String(bytes[i], csName);
             if (!r.equals(s))
                 mismatch(i, bytes[i], r, s);
         }
         log.println("String(byte[] ba, \"" + csName + "\") okay");
 
         // To be really thorough we should test OutputStreamWriter,
         // InputStreamReader, and Charset{De,En}Coder here also,
         // but the above will do for now.
 
         if (errors > 0) {
             throw new RuntimeException(errors + " error(s) occurred");
         }
 
     }
 
     // Usage: Check charsetName referenceFileName
     public static void main(String[] args) throws Exception {
         new Check(args[0], args[1]).load().check();
     }
 
 }