1 /*

     2  * Copyright 2010 Sun Microsystems, Inc.  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.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package java.lang;

    27 

    28 import java.io.DataInputStream;

    29 import java.io.InputStream;

    30 import java.lang.ref.SoftReference;

    31 import java.util.Arrays;

    32 import java.util.zip.InflaterInputStream;

    33 import java.security.AccessController;

    34 import java.security.PrivilegedAction;

    35 

    36 class CharacterName {

    37 

    38     private static SoftReference<byte[]> refStrPool;

    39     private static int[][] lookup;

    40 

    41     private static synchronized byte[] initNamePool() {

    42         byte[] strPool = null;

    43         if (refStrPool != null && (strPool = refStrPool.get()) != null)

    44             return strPool;

    45         DataInputStream dis = null;

    46         try {

    47             dis = new DataInputStream(new InflaterInputStream(

    48                 AccessController.doPrivileged(new PrivilegedAction<InputStream>()

    49                 {

    50                     public InputStream run() {

    51                         return getClass().getResourceAsStream("uniName.dat");

    52                     }

    53                 })));

    54 

    55             lookup = new int[(Character.MAX_CODE_POINT + 1) >> 8][];

    56             int total = dis.readInt();

    57             int cpEnd = dis.readInt();

    58             byte ba[] = new byte[cpEnd];

    59             dis.readFully(ba);

    60 

    61             int nameOff = 0;

    62             int cpOff = 0;

    63             int cp = 0;

    64             do {

    65                 int len = ba[cpOff++] & 0xff;

    66                 if (len == 0) {

    67                     len = ba[cpOff++] & 0xff;

    68                     // always big-endian

    69                     cp = ((ba[cpOff++] & 0xff) << 16) |

    70                          ((ba[cpOff++] & 0xff) <<  8) |

    71                          ((ba[cpOff++] & 0xff));

    72                 }  else {

    73                     cp++;

    74                 }

    75                 int hi = cp >> 8;

    76                 if (lookup[hi] == null) {

    77                     lookup[hi] = new int[0x100];

    78                 }

    79                 lookup[hi][cp&0xff] = (nameOff << 8) | len;

    80                 nameOff += len;

    81             } while (cpOff < cpEnd);

    82             strPool = new byte[total - cpEnd];

    83             dis.readFully(strPool);

    84             refStrPool = new SoftReference<byte[]>(strPool);

    85         } catch (Exception x) {

    86             throw new InternalError(x.getMessage());

    87         } finally {

    88             try {

    89                 if (dis != null)

    90                     dis.close();

    91             } catch (Exception xx) {}

    92         }

    93         return strPool;

    94     }

    95 

    96     public static String get(int cp) {

    97         byte[] strPool = null;

    98         if (refStrPool == null || (strPool = refStrPool.get()) == null)

    99             strPool = initNamePool();

   100         int off = 0;

   101         if (lookup[cp>>8] == null ||

   102             (off = lookup[cp>>8][cp&0xff]) == 0)

   103             return null;

   104         return new String(strPool, 0, off >>> 8, off & 0xff);  // ASCII

   105     }

   106 }